The prevalence of metabolic diseases,some diseases that are seriously harmful for human health and affect the quality of life,is increasing year by year.Early detection and intervention is the common strategy to deal ...The prevalence of metabolic diseases,some diseases that are seriously harmful for human health and affect the quality of life,is increasing year by year.Early detection and intervention is the common strategy to deal with them.Infrared thermography(IRT)is a special medical imaging technology which can capture the changes of skin temperature associated with metabolic disorders.It might be a new method for early detection of metabolic diseases.The purpose of this review is to summarize advances of the use of IRT in evaluating single metabolic disorder such as obesity,hyperglycemia and hypertension,complex metabolic disorders such as metabolic syndrome and target organ damage such as coronary artery atherosclerosis and diabetic foot.The characteristic of thermograms of metabolic disease patients,the changes of thermal maps during the development of the disease,and the lacks in current studies are also discussed in the article.展开更多
The method of infrared thermography to predict the temperature of the sulfide ores has a large error. To solve this problem, the temperature of the sulfide ores is measured by thermal infrared imager and recording the...The method of infrared thermography to predict the temperature of the sulfide ores has a large error. To solve this problem, the temperature of the sulfide ores is measured by thermal infrared imager and recording thermometric instrument contrastively. The main factors, including emissivity, distance, angle and dust concentration that affect the temperature measurement precision, are analyzed. The regression equations about the individual factors and comprehensive factors are obtained by analyzing test data. The application of the regression equations improves the precision of the thermal infrared imager. The geometric information lost in traditional infrared thermometry is determined by visualization grid method and interpolation method, the relationship between the infrared imager and geometry information is established. The geometry location can be measured exactly.展开更多
Fatigue behavior of AZ31B magnesium alloy electron beam welded joint undergoing cyclic loading was investigated by infrared thermography. Temperature evolution throughout a fatigue process was presented and the mechan...Fatigue behavior of AZ31B magnesium alloy electron beam welded joint undergoing cyclic loading was investigated by infrared thermography. Temperature evolution throughout a fatigue process was presented and the mechanism of heat generationwas discussed. Fatigue limit of the welded joint was predicted and the fatigue damage was also assessed based ontheevolution of the temperatureand hotspot zone on the specimen surfaceduring fatigue tests. The presented results show that infrared thermography can not onlyquicklypredict the fatigue behavior of the welded joint, but also qualitatively identify the evolution of fatigue damage in real time. It is found that the predicted fatigue limit agrees well with the conventionalS-Nexperimental results. The evolution of the temperatureand hotspot zone on the specimen surface can be an effectivefatigue damage indicatorfor effectiveevaluationof magnesium alloy electron beam welded joint.展开更多
The heat generation behaviors of fatigue crack are deeply investigated under different preload forces combing numerical simulation and experiment.Firstly,a multi-contact simulation model is applied to stimulate the cr...The heat generation behaviors of fatigue crack are deeply investigated under different preload forces combing numerical simulation and experiment.Firstly,a multi-contact simulation model is applied to stimulate the crack surfaces contact and the horn-sample contact under ultrasonic excitation for calculating the temperature fields.Then,the ultrasonic infrared thermography testing and the microscope testing are carried out for the heat generation and the plastic deformation behaviors of crack region under different preload forces.On this basis,an indirect observation method based on dots distribution is proposed to estimate the plastic deformation on crack contact surfaces.The obtained results show that the temperature rise of crack region increases with the increase of preload force when the preload force is less than 250 N,while the temperature rise rapidly declines due to the plastic deformation on crack contact surfaces and the inhibition effect when the preload force is 280 N.Moreover,the plastic deformation does not lead to the crack propagation,but reduces the detection repeatability of fatigue crack.This work provides an effective method for optimizing testing conditions in practical testing processes,which will be helpful to the establishment of testing standards for batches of test objects in ultrasonic infrared thermography testing.展开更多
The fatigue behavior during high cycle fatigue testing and the tensile behavior of 5A06 aluminum alloy considering the anisotropy were studied.Two types of specimens including longitudinal specimen（parallel to the ro...The fatigue behavior during high cycle fatigue testing and the tensile behavior of 5A06 aluminum alloy considering the anisotropy were studied.Two types of specimens including longitudinal specimen（parallel to the rolling direction） and transverse specimen（perpendicular to the rolling direction） were prepared.Infrared thermography was employed to monitor the temperature evolution during the fatigue and tensile tests.The temperature evolution curves in the two directions were contrastively analyzed.It is found that the temperature evolution during fatigue process possesses four stages：initial temperature rise stage,slow temperature decline stage,rapid temperature rise stage,and finial temperature decline stage.The heat generating mechanisms of the four stages are discussed.Obvious differences can be found between the longitudinal specimen and transverse specimen in fatigue strength and fatigue life.The fatigue strength and fatigue life of longitudinal specimen are higher than those of transverse specimen.During the tensile and fatigue testing process,the fracture temperature in the transverse direction are higher than that in the longitudinal direction.The fatigue strength prediction by means of infrared thermography has a good consistency with that by the traditional method.展开更多
In the field of plant protection,certain methods for assessing the current pest situation and implementing appropriate protection countermeasures can effectively protect plants while saving manpower and material resou...In the field of plant protection,certain methods for assessing the current pest situation and implementing appropriate protection countermeasures can effectively protect plants while saving manpower and material resources.However,current pest monitoring methods are primarily based on the stage of"seeing,hand checking,disc shooting and net catching",and the level of automation is low.Manual methods are time-consuming,prone to error,and difficult to review.We designed a method based on infrared thermography principle for counting Ricania guttata(Walker),a pest which is harmful to mangrove plants.This method,which is based on thermal infrared images and binarized image segmentation,realizes image processing of surface temperature,effectively distinguishes pests and sticky board,automatically counts the number of pests,and expands the data source based on image processing.Furthermore,this method contributes to the solution of the problem that counting error of insect close to the color of sticky board is greater in image recognition of visible light,when the pest color is close to the stick board.It can facilitate manual investigation of mangrove pests,simply and efficiently count the number of pests on the stick board,and provide data and technical support for pest condition analysis and control.展开更多
Resonant magnetic perturbations(RMPs)with high toroidal mode number n are considered for controlling edge-localized modes(ELMs)and divertor heat flux in future ITER H-mode operations.In this paper,characteristics of d...Resonant magnetic perturbations(RMPs)with high toroidal mode number n are considered for controlling edge-localized modes(ELMs)and divertor heat flux in future ITER H-mode operations.In this paper,characteristics of divertor heat flux under high-nRMPs(n=3 and 4)in H-mode plasma are investigated using newly upgraded infrared thermography diagnostic in EAST.Additional splitting strike point(SSP)accompanying with ELM suppression is observed under both RMPs with n=3 and n=4,the SSP in heat flux profile agrees qualitatively with the modeled magnetic footprint.Although RMPs suppress ELMs,they increase the stationary heat flux during ELM suppression.The dependence of heat flux on q_(95)during ELM suppression is preliminarily investigated,and further splitting in the original strike point is observed at q 495=during ELM suppression.In terms of ELM pulses,the presence of RMPs shows little influence on transient heat flux distribution.展开更多
A 3D temperature field distribution of biological tissue for superficial hyperthermia using a pulse modulated microwave （PMMW） was presented. A 3D sliced homogeneous phantom was radiated by the PMMW and an infrared ...A 3D temperature field distribution of biological tissue for superficial hyperthermia using a pulse modulated microwave （PMMW） was presented. A 3D sliced homogeneous phantom was radiated by the PMMW and an infrared thermal imager was applied to image temperature distribution throughout the phantom. The period of the PMMW is 3 s and the output power is 35 W. The temperature rises by at least 3 ℃ in the phantom when the duty cycle varies from 1/3, 1/2, 2/3 to 1 （denoted by scenarios 1-4）. Both the accumulative temperature-volume histogram and the relative depth-area ratio histogram show that the maximum temperature rise （MTR） is 6.6 and 8 ℃ in scenarios 2 and 3, and they are superior to scenarios 1 and 4. Furthermore, the PMMW can control temperature field distribution of biological tissue. It provides both preliminary basis for thermal volume control and new technology for temperature control and monitor in superficial hyperthermia.展开更多
In this work, a 532 nm diode CW laser is used to heat samples used as building materials at a 1 meter standoff distance while using an FLIR (Forward-Looking Infrared) thermal camera to monitor and record the heating a...In this work, a 532 nm diode CW laser is used to heat samples used as building materials at a 1 meter standoff distance while using an FLIR (Forward-Looking Infrared) thermal camera to monitor and record the heating and then cooling of each sample after lasers are switched off. The data is then analyzed using FLIR proprietary software. Since the absorption spectra of materials are unique, using multiple lasers of different wavelengths to simultaneously shine onto the sample at different locations would give enough thermal data to successfully characterize the samples within a reasonable amount of time. The results are very promising for applications involving non-destructive detection and classification of materials.展开更多
Background Total knee arthroplasty （TKA） is a successful and frequently performed procedure in orthopedic surgery.The diagnosis of peri-prosthetic joint infection following TKA remains challenging.The present study ...Background Total knee arthroplasty （TKA） is a successful and frequently performed procedure in orthopedic surgery.The diagnosis of peri-prosthetic joint infection following TKA remains challenging.The present study estimated the usefulness of knee skin temperature （measured by infrared thermography） and serum soluble intercellular adhesion molecule-1 （slCAM-1） in the diagnosis of post-operative knee peri-prosthetic infection.Methods Patients were divided into three groups：21 patients undergoing uncomplicated TKAs,seven with prosthesis infection,and three undergoing TKA revisions.The serum levels of interleukin-6 （IL-6）,C-reactive protein （CRP）,erythrocyte sedimentation rate （ESR）,and slCAM-1 as well as the local knee skin temperature were measured preoperatively and on Days 1 and 7 and at 1,3,and 6 months post-operatively in Groups 1 and 3.The same parameters were measured in Group 2 at the time of prosthesis infection diagnosis.Results In Group 1,the levels of IL-6,CRP,ESR,and knee skin temperature were significantly elevated post-operatively,but returned to baseline levels within 6 months.The slCAM-1 levels were not significantly different.The mean differential temperature （MDT） and levels of siCAM-1,IL-6,CRP,and ESR differed significantly between Groups 1 and 2.The MDT had returned to normal in Group 3 by 6 months post-operatively.Conclusions Elevations in IL-6,CRP,ESR,and MDT in patients undergoing TKA could be a normal response to surgical trauma,but sustained elevations may be indicative of complications.The knee skin temperature and slCAM-1 may be used as indicators in the diagnosis of knee prosthesis infection following TKA.展开更多
Objective: To analyse and explore the diagnostic significance of infrared thermography on the patients with lumbar intervertebral disc protrusion.Methods: Forty-five hospitalized cases under conservative treatment (ma...Objective: To analyse and explore the diagnostic significance of infrared thermography on the patients with lumbar intervertebral disc protrusion.Methods: Forty-five hospitalized cases under conservative treatment (mainly manipulation) and 65 controls were consecutively selected. Both groups were examined with infrared thermography on lower back and lower extremities as well as physical examination before and after treatment. The study statistically analysed the temperature difference between the involved and healthy parts at different areas; and also compared the variation of the temperature difference after the treatment to the decreasing scores of physical examination afterward. Results: The statistic result showed that the temperature difference between two sides on patient group was significantly higher than those of the control group. The further analysis showed that the temperature difference at posterior femur area in the patients’ group correlated significantly to the severity of clinical signs caused by nerve root irritation.Conclusion: The thermogram was uncertain to the segmental diagnosis of lumbar disc protrusion and could only be considered as a reference in the final diagnosis. Nevertheless, it is helpful to discover the severity of radical signs according to the posterior femoral region of hypo- (hyper-) thermogram.展开更多
Energy consumption in urban environment in the EU accounts for about 40%of the total energy consumption,and the majority of this energy is utilised for heating and air conditioning of buildings.Hence the process of in...Energy consumption in urban environment in the EU accounts for about 40%of the total energy consumption,and the majority of this energy is utilised for heating and air conditioning of buildings.Hence the process of insulating and retrofitting of relatively old buildings is essential to enhance the thermal performance and hence contribute to energy and carbon emission reduction.There is a need to enhance people’s engagement and education in relation to such issues to inspire and encourage positive actions and investment from the public.This paper presents an approach of combining a novel training process using a low-cost infrared thermal camera with small scale building model to promote DIY(Do-It-Yourself)infrared survey for the public to evaluate the performance of their own homes in order to identify any issues related to insulation or air leaks from the building envelop to encourage them to take corrective actions.The work included the engagement of 50 people to survey their own homes to capture the technical findings as well as their personal reaction and feedback.The results show that 88%of participants have found the educational session helpful to understand the infrared thermography;and 92%have considered the infrared camera to be an effective tool to indicate location of heat losses.Additionally,90%of participants trust that the thermal camera has helped them to identify insulation defects that cause heat losses in their homes.Moreover,84%believe that the thermal imaging has convinced them to think more seriously about the heat losses of their homes and what they could do to improve that.The experimental thermography surveys have shown that many houses have limitations in terms of thermal insulation which have been identified by the participants.This DIY interaction has provided enhanced public engagement and energy awareness via the use of the technology.The financial issues are also found to be critical,as none of the participants would have done the survey if they had to pay for it.Hence,this paper provides a solution for households with limited budgets.展开更多
In most countries,buildings are responsible for significant energy consumption where space heating and air conditioning is responsible for the majority of this energy use.To reduce this massive consumption and decreas...In most countries,buildings are responsible for significant energy consumption where space heating and air conditioning is responsible for the majority of this energy use.To reduce this massive consumption and decrease carbon emission,thermal insulation of buildings can play an important role.The estimation of energy savings following the improvement of a building’s insulation remains a key area of research in order to calculate the cost savings and the payback period.In this paper,a case study has been presented where deep retrofitting has been introduced to an existing building to bring it closer to a Passivhaus standard with the introduction of insulation and solar photovoltaic panels.The thermal performance of the building with its improved insulation has been evaluated using infrared thermography.Artificial intelligence using deep learning neural networks is implemented to predict the thermal performance of the building and the expected energy savings.The prediction of neural networks is compared with the actual savings calculated using historical weather data.The results of the neural network show high accuracy of predicting the actual energy savings with success rate of about 82%when compared with the calculated values.The results show that this suggested approach can be used to rapidly predict energy savings from retrofitting of buildings with reasonable accuracy,hence providing a practical rapid tool for the building industry and communities to estimate energy savings.A mathematical model has been also developed which has indicated a life-long monitoring will be needed to precisely estimate the benefits of energy savings in retrofitting due to the change in weather conditions and people’s behaviour.展开更多
A quantitative energy leakage model was developed based on the thermography image data measured for both external and internal building surfaces.The infrared thermography images of both surfaces of doors,windows,and w...A quantitative energy leakage model was developed based on the thermography image data measured for both external and internal building surfaces.The infrared thermography images of both surfaces of doors,windows,and walls of an office building in the Hengqin Campus of University of Macao were taken at various times in a day for four seasons.The transient heat flux for sample units were obtained based on measurements of the seasonal transient local temperature differences and calculations of the effective thermal conductivity from the multiple-layer porous medium conduction model.Effects of construction unit types,orientations,and seasons were quantitatively investigated with unit transient orientation index factors.The corresponding electric energy consumption was calculated based on the air conditioning system coefficient of performance of heat pump and refrigerator cycles for different seasons.The model was validated by comparing to the electric meter records of energy consumption of the air conditioning system.The uncertainties of the predicted total building energy leakage are about 14.7%,12.8%,12.4%,and 15.8%for the four seasons,respectively.The differences between the predicted electric consumption and meter values are less than 13.4%and 5.4%for summer and winter,respectively.The typical daily thermal energy leakage value in winter is the highest among the four seasons.However,the daily electric energy consumption by the air conditioning system in summer and autumn is higher than that in winter.The present decomposition model for energy leakage is expected to provide a practical tool for quantitative analysis of energy leakage of buildings.展开更多
Objective: To explore the possibility of using cortical infrared thermography (CIT) and temperature in studying the principle of acupuncture and moxibustion. Methods: The changes of the cerebral cortical temperature d...Objective: To explore the possibility of using cortical infrared thermography (CIT) and temperature in studying the principle of acupuncture and moxibustion. Methods: The changes of the cerebral cortical temperature during electro-acupuncture (EA) measured by CIT in twenty cats were observed. By opening the skull before experiments, the cortex of animals was revealed. The distribution of the conical temperature of the awakened animals was studied by AGA infrared thermovision, and the thermograms were analysed by computer. Results: (1) The thermograms of the profile of the cortex could be displayed clearly, the temperature was higher in the ante and lower in post-cortex than that in other regions. (2) No tendency of conical temperature ascending within 30 minutes in cats without EA. (3 ) After EA, the temperature of cortex generally increased by 0.3 to 1.7 degrees centigrade, and 5 min after EA, the increment of temperature was the highest, 10 min after EA, the temperature increment was higher than before EA, but lower than 5 min after EA. The conical temperature recovered 10 min after stopping the stimulation. (4) The temperature increment was more obvious in the regions of ant. ectosylvian, ant. supra-Sylvian and ant. Sylvian than that in other regions. No matter where the site of EA was, every group had its own special region of higher temperature increment. Conclusion: The temperature increased in the cortex were mainly in the somatosensory regions. The extent and position of temperature response of cortex after EA could be displayed with CIT directly by picture. The display of the temperature response could be taken as the indication of the nervous activity. CIT could be used to conduct the studies of the acupuncture and the brain.展开更多
The non-destructive testing(NDT)of debonding in stainless steel composites plate(SSCP)is performed by infrared thermography,finite element analysis(FEA)software ANSYS is taken as the simulative tool,and 2D simulative ...The non-destructive testing(NDT)of debonding in stainless steel composites plate(SSCP)is performed by infrared thermography,finite element analysis(FEA)software ANSYS is taken as the simulative tool,and 2D simulative model has been set up to investigate effect of the thickness of coating and/or substrate on the detectibility of debonging in SSCPs.Two parameters,namely the maximum defect temperature difference and defect appearing index,are defined to evaluate the detectivity of defects,and their computational methods and formulas are given respectively.The preliminary changing tendency of the maximum defect temperature difference and defect appearing index with the thickness of coating and/or substrate is found by numerical simulation.展开更多
Background:To date,there has been a great lack of investigation on the influence of age on blood flow and temperature of acupoints in specific regions.Objective:This study aimed to determine the association between di...Background:To date,there has been a great lack of investigation on the influence of age on blood flow and temperature of acupoints in specific regions.Objective:This study aimed to determine the association between different age categories and acupoint blood flow/temperature on the forearm.Methods:Acupoint blood flow and temperature were measured in healthy adults of different age categories using laser doppler flowmetry(LDF)and infrared thermography(IRT),respectively.A total of 60 eligible healthy volunteers were divided into the young group,mid age group and old age group.All groups received LDF and IRT examination.Shenmen(HT7),Shaohai(HT3),Taiyuan(LU9)and Chize(LU5)of the Heart and Lung meridians on the forearm were selected as 4 test acupoints.Results:Regarding blood flow of the 4 test acupoints,the PU of Taiyuan(LU9)in the old age group was sig-nificantly different compared with that of the young age group(P<0.05)and the mid age group(P<0.05),while there was no significant difference in PU of the other acupoints between 3 groups(all P>0.05).Simi-larly,regarding acupoint temperature of the 4 test sites,the temperature of Shaohai(HT3)in the old age group was significantly different compared with that of the mid age group(P<0.05),while there was no significant difference in the temperature of the other 3 acupoints between 3 age groups(all P>0.05).Conclusion:Age category tends to have notable influence on the blood flow and temperature in specific acupoints in the forearm.Therefore,particular concerns should be taken into consideration regarding the effect of age differences for future studies in this field.Nevertheless,further studies with a large sample size and more test acupoints are needed to further verify current findings.展开更多
This paper presents an overview of experimental investigations conducted at China University of Mining and Technology Beijing(CUMTB) on roadway excavation using large-scale geomechanical model tests.The simulated sedi...This paper presents an overview of experimental investigations conducted at China University of Mining and Technology Beijing(CUMTB) on roadway excavation using large-scale geomechanical model tests.The simulated sedimentary rocks are composed by alternating layers of sandstone, mudstone and coal seam inclined at varied angles with respect to the horizontal including 0°, 45°, 60°, and 90°. During the excavation, infrared thermography was employed to detect the thermal response of the surrounding rocks under excavation. The obtained raw thermograms were processed using denoising algorithm, data reduction procedure and Fourier analysis. The infrared temperature(IRT) characterizes the overall rock response; the processed thermal images represent the structural behavior, and the Fourier spectrum describes damage development in the frequency domain. Deeper understanding was achieved by the comparative analyses of excavation in differently inclined rock masses using the image features of IRTs, thermal images and Fourier spectra.展开更多
Background:Increasing threat to Central Europe’s forests from the growing population of the European spruce bark beetle Ips typographus (L.) calls for developing highly effective methods of detection of the infestati...Background:Increasing threat to Central Europe’s forests from the growing population of the European spruce bark beetle Ips typographus (L.) calls for developing highly effective methods of detection of the infestation spots. The main goal of this study was to establish an automatic workflow for detection of dead trees and trees in poor condition of Picea abies using Middle Wave Infrared spectral range obtained from the aircraft.Methods:The studies were conducted in Wigry National Park (Poland) in 2020. A fusion of aircraft thermal data and laser scanning was used. Synchronous with thermal data acquisition ground reference data were obtained for P. abies in different health conditions. Determination of the range of canopy temperatures characteristic of the three condition states (‘healthy’,‘poor condition’,‘dead’) was performed using K-mean clustering. The accuracy of the method was evaluated on two validation sets:(1) individual tree canopies determined by photointerpretation, and (2) automatic segmentation of laser scanning data.Results:The results showed that the average temperature of ‘healthy’trees was 27.70℃, trees in ‘poor condition’28.57℃, and ‘dead’trees 30.17℃. High temperature differences between ‘healthy’and ‘dead’P. abies made it possible to distinguish these two condition classes with high accuracy. Lower accuracies were obtained for the class of ‘poor condition’, which was found to be confusing with both ‘healthy’and ‘dead’trees. According to results from the first validation set, a high overall accuracy of 0.60 was obtained. For the second validation set, the overall accuracy was reduced by 11%.Conclusions:This study indicates that canopy temperature recorded from the airborne level is a variable that differentiates ‘healthy’spruces from those in ‘poor condition’and the ‘dead’trees. The results confirmed that thermal and airborne laser scanning data fusion allows for creating a quick and simple workflow, which can successfully separate individual tree canopies and identify P. abies attacked by I. typographus. Further research is needed to identify trees in the early stages of invasion.展开更多
Non-contact sensing can be a rapid and convenient alternative for determining structure response compared to conventional instrumentation.Computer vision has been broadly implemented to enable accurate non-contact dyn...Non-contact sensing can be a rapid and convenient alternative for determining structure response compared to conventional instrumentation.Computer vision has been broadly implemented to enable accurate non-contact dynamic response measurements for structures.This study has analyzed the effect of non-contact sensors,including type,frame rate,and data collection platform,on the performance of a novel motion detection technique.Video recordings of a cantilever column were collected using a high-speed camera mounted on a tripod and an unmanned aerial system(UAS)equipped with visual and thermal sensors.The test specimen was subjected to an initial deformation and released.Specimen acceleration data were collected using an accelerometer installed on the cantilever end.The displacement from each non-contact sensor and the acceleration from the contact sensor were analyzed to measure the specimen′s natural frequency and damping ratio.The specimen′s first fundamental frequency and damping ratio results were validated by analyzing acceleration data from the top of the specimen and a finite element model.展开更多
基金Special Fund for Basic Scientific Research of Central Universities(2020-JYB-ZDGG-117)。
文摘The prevalence of metabolic diseases,some diseases that are seriously harmful for human health and affect the quality of life,is increasing year by year.Early detection and intervention is the common strategy to deal with them.Infrared thermography(IRT)is a special medical imaging technology which can capture the changes of skin temperature associated with metabolic disorders.It might be a new method for early detection of metabolic diseases.The purpose of this review is to summarize advances of the use of IRT in evaluating single metabolic disorder such as obesity,hyperglycemia and hypertension,complex metabolic disorders such as metabolic syndrome and target organ damage such as coronary artery atherosclerosis and diabetic foot.The characteristic of thermograms of metabolic disease patients,the changes of thermal maps during the development of the disease,and the lacks in current studies are also discussed in the article.
基金Project (51074181) supported by the National Natural Science Foundation of ChinaProject (2010ssxt241) supported by Precious Dissertation Innovation Foundation of Central South University, China
文摘The method of infrared thermography to predict the temperature of the sulfide ores has a large error. To solve this problem, the temperature of the sulfide ores is measured by thermal infrared imager and recording thermometric instrument contrastively. The main factors, including emissivity, distance, angle and dust concentration that affect the temperature measurement precision, are analyzed. The regression equations about the individual factors and comprehensive factors are obtained by analyzing test data. The application of the regression equations improves the precision of the thermal infrared imager. The geometric information lost in traditional infrared thermometry is determined by visualization grid method and interpolation method, the relationship between the infrared imager and geometry information is established. The geometry location can be measured exactly.
基金Project(51305292)supported by the National Natural Science Foundation of ChinaProject(20105429001)supported by the National Aeronautical Science Foundation of China
文摘Fatigue behavior of AZ31B magnesium alloy electron beam welded joint undergoing cyclic loading was investigated by infrared thermography. Temperature evolution throughout a fatigue process was presented and the mechanism of heat generationwas discussed. Fatigue limit of the welded joint was predicted and the fatigue damage was also assessed based ontheevolution of the temperatureand hotspot zone on the specimen surfaceduring fatigue tests. The presented results show that infrared thermography can not onlyquicklypredict the fatigue behavior of the welded joint, but also qualitatively identify the evolution of fatigue damage in real time. It is found that the predicted fatigue limit agrees well with the conventionalS-Nexperimental results. The evolution of the temperatureand hotspot zone on the specimen surface can be an effectivefatigue damage indicatorfor effectiveevaluationof magnesium alloy electron beam welded joint.
基金Project(2019M650262)supported by the China Postdoctoral Science FoundationProject(92060106)supported by the Major Research Plan of National Natural Science Foundation of ChinaProject(201803U8003)supported by the China Aeronautical Science Foundation。
文摘The heat generation behaviors of fatigue crack are deeply investigated under different preload forces combing numerical simulation and experiment.Firstly,a multi-contact simulation model is applied to stimulate the crack surfaces contact and the horn-sample contact under ultrasonic excitation for calculating the temperature fields.Then,the ultrasonic infrared thermography testing and the microscope testing are carried out for the heat generation and the plastic deformation behaviors of crack region under different preload forces.On this basis,an indirect observation method based on dots distribution is proposed to estimate the plastic deformation on crack contact surfaces.The obtained results show that the temperature rise of crack region increases with the increase of preload force when the preload force is less than 250 N,while the temperature rise rapidly declines due to the plastic deformation on crack contact surfaces and the inhibition effect when the preload force is 280 N.Moreover,the plastic deformation does not lead to the crack propagation,but reduces the detection repeatability of fatigue crack.This work provides an effective method for optimizing testing conditions in practical testing processes,which will be helpful to the establishment of testing standards for batches of test objects in ultrasonic infrared thermography testing.
基金Funded by the National Natural Science Foundation of China(Nos.51175364,51505322)Natural Science Foundation of Shanxi Province of China(No.2013011014-3)
文摘The fatigue behavior during high cycle fatigue testing and the tensile behavior of 5A06 aluminum alloy considering the anisotropy were studied.Two types of specimens including longitudinal specimen（parallel to the rolling direction） and transverse specimen（perpendicular to the rolling direction） were prepared.Infrared thermography was employed to monitor the temperature evolution during the fatigue and tensile tests.The temperature evolution curves in the two directions were contrastively analyzed.It is found that the temperature evolution during fatigue process possesses four stages：initial temperature rise stage,slow temperature decline stage,rapid temperature rise stage,and finial temperature decline stage.The heat generating mechanisms of the four stages are discussed.Obvious differences can be found between the longitudinal specimen and transverse specimen in fatigue strength and fatigue life.The fatigue strength and fatigue life of longitudinal specimen are higher than those of transverse specimen.During the tensile and fatigue testing process,the fracture temperature in the transverse direction are higher than that in the longitudinal direction.The fatigue strength prediction by means of infrared thermography has a good consistency with that by the traditional method.
文摘In the field of plant protection,certain methods for assessing the current pest situation and implementing appropriate protection countermeasures can effectively protect plants while saving manpower and material resources.However,current pest monitoring methods are primarily based on the stage of"seeing,hand checking,disc shooting and net catching",and the level of automation is low.Manual methods are time-consuming,prone to error,and difficult to review.We designed a method based on infrared thermography principle for counting Ricania guttata(Walker),a pest which is harmful to mangrove plants.This method,which is based on thermal infrared images and binarized image segmentation,realizes image processing of surface temperature,effectively distinguishes pests and sticky board,automatically counts the number of pests,and expands the data source based on image processing.Furthermore,this method contributes to the solution of the problem that counting error of insect close to the color of sticky board is greater in image recognition of visible light,when the pest color is close to the stick board.It can facilitate manual investigation of mangrove pests,simply and efficiently count the number of pests on the stick board,and provide data and technical support for pest condition analysis and control.
基金supported by the National Key Research and Development Program of China (No. 2017YFA0402500)the National MCF Energy R&D Program of China (No. 2019YFE03040000)+5 种基金National Natural Science Foundation of China (Nos. 12005262 and 11975274)the Foundation of President of Hefei Institutes of Physical Science, CAS (No. YZJJ2018QN8)the Anhui Provincial Natural Science Foundation (No. 2108085J06)the Users with Excellence Program of Hefei Science Center CAS (Nos. 2021HSC-UE018 and 2020HSC-UE011)External Cooperation Program of Chinese Academy of Sciences (No. 116134KYSB20180035)Science Foundation of Institute of Plasma Physics, Chinese Academy of Sciences (No. DSJJ-2021-04)
文摘Resonant magnetic perturbations(RMPs)with high toroidal mode number n are considered for controlling edge-localized modes(ELMs)and divertor heat flux in future ITER H-mode operations.In this paper,characteristics of divertor heat flux under high-nRMPs(n=3 and 4)in H-mode plasma are investigated using newly upgraded infrared thermography diagnostic in EAST.Additional splitting strike point(SSP)accompanying with ELM suppression is observed under both RMPs with n=3 and n=4,the SSP in heat flux profile agrees qualitatively with the modeled magnetic footprint.Although RMPs suppress ELMs,they increase the stationary heat flux during ELM suppression.The dependence of heat flux on q_(95)during ELM suppression is preliminarily investigated,and further splitting in the original strike point is observed at q 495=during ELM suppression.In terms of ELM pulses,the presence of RMPs shows little influence on transient heat flux distribution.
基金Project(50977064) supported by the National Natural Science Foundation of China
文摘A 3D temperature field distribution of biological tissue for superficial hyperthermia using a pulse modulated microwave （PMMW） was presented. A 3D sliced homogeneous phantom was radiated by the PMMW and an infrared thermal imager was applied to image temperature distribution throughout the phantom. The period of the PMMW is 3 s and the output power is 35 W. The temperature rises by at least 3 ℃ in the phantom when the duty cycle varies from 1/3, 1/2, 2/3 to 1 （denoted by scenarios 1-4）. Both the accumulative temperature-volume histogram and the relative depth-area ratio histogram show that the maximum temperature rise （MTR） is 6.6 and 8 ℃ in scenarios 2 and 3, and they are superior to scenarios 1 and 4. Furthermore, the PMMW can control temperature field distribution of biological tissue. It provides both preliminary basis for thermal volume control and new technology for temperature control and monitor in superficial hyperthermia.
文摘In this work, a 532 nm diode CW laser is used to heat samples used as building materials at a 1 meter standoff distance while using an FLIR (Forward-Looking Infrared) thermal camera to monitor and record the heating and then cooling of each sample after lasers are switched off. The data is then analyzed using FLIR proprietary software. Since the absorption spectra of materials are unique, using multiple lasers of different wavelengths to simultaneously shine onto the sample at different locations would give enough thermal data to successfully characterize the samples within a reasonable amount of time. The results are very promising for applications involving non-destructive detection and classification of materials.
文摘Background Total knee arthroplasty （TKA） is a successful and frequently performed procedure in orthopedic surgery.The diagnosis of peri-prosthetic joint infection following TKA remains challenging.The present study estimated the usefulness of knee skin temperature （measured by infrared thermography） and serum soluble intercellular adhesion molecule-1 （slCAM-1） in the diagnosis of post-operative knee peri-prosthetic infection.Methods Patients were divided into three groups：21 patients undergoing uncomplicated TKAs,seven with prosthesis infection,and three undergoing TKA revisions.The serum levels of interleukin-6 （IL-6）,C-reactive protein （CRP）,erythrocyte sedimentation rate （ESR）,and slCAM-1 as well as the local knee skin temperature were measured preoperatively and on Days 1 and 7 and at 1,3,and 6 months post-operatively in Groups 1 and 3.The same parameters were measured in Group 2 at the time of prosthesis infection diagnosis.Results In Group 1,the levels of IL-6,CRP,ESR,and knee skin temperature were significantly elevated post-operatively,but returned to baseline levels within 6 months.The slCAM-1 levels were not significantly different.The mean differential temperature （MDT） and levels of siCAM-1,IL-6,CRP,and ESR differed significantly between Groups 1 and 2.The MDT had returned to normal in Group 3 by 6 months post-operatively.Conclusions Elevations in IL-6,CRP,ESR,and MDT in patients undergoing TKA could be a normal response to surgical trauma,but sustained elevations may be indicative of complications.The knee skin temperature and slCAM-1 may be used as indicators in the diagnosis of knee prosthesis infection following TKA.
文摘Objective: To analyse and explore the diagnostic significance of infrared thermography on the patients with lumbar intervertebral disc protrusion.Methods: Forty-five hospitalized cases under conservative treatment (mainly manipulation) and 65 controls were consecutively selected. Both groups were examined with infrared thermography on lower back and lower extremities as well as physical examination before and after treatment. The study statistically analysed the temperature difference between the involved and healthy parts at different areas; and also compared the variation of the temperature difference after the treatment to the decreasing scores of physical examination afterward. Results: The statistic result showed that the temperature difference between two sides on patient group was significantly higher than those of the control group. The further analysis showed that the temperature difference at posterior femur area in the patients’ group correlated significantly to the severity of clinical signs caused by nerve root irritation.Conclusion: The thermogram was uncertain to the segmental diagnosis of lumbar disc protrusion and could only be considered as a reference in the final diagnosis. Nevertheless, it is helpful to discover the severity of radical signs according to the posterior femoral region of hypo- (hyper-) thermogram.
文摘Energy consumption in urban environment in the EU accounts for about 40%of the total energy consumption,and the majority of this energy is utilised for heating and air conditioning of buildings.Hence the process of insulating and retrofitting of relatively old buildings is essential to enhance the thermal performance and hence contribute to energy and carbon emission reduction.There is a need to enhance people’s engagement and education in relation to such issues to inspire and encourage positive actions and investment from the public.This paper presents an approach of combining a novel training process using a low-cost infrared thermal camera with small scale building model to promote DIY(Do-It-Yourself)infrared survey for the public to evaluate the performance of their own homes in order to identify any issues related to insulation or air leaks from the building envelop to encourage them to take corrective actions.The work included the engagement of 50 people to survey their own homes to capture the technical findings as well as their personal reaction and feedback.The results show that 88%of participants have found the educational session helpful to understand the infrared thermography;and 92%have considered the infrared camera to be an effective tool to indicate location of heat losses.Additionally,90%of participants trust that the thermal camera has helped them to identify insulation defects that cause heat losses in their homes.Moreover,84%believe that the thermal imaging has convinced them to think more seriously about the heat losses of their homes and what they could do to improve that.The experimental thermography surveys have shown that many houses have limitations in terms of thermal insulation which have been identified by the participants.This DIY interaction has provided enhanced public engagement and energy awareness via the use of the technology.The financial issues are also found to be critical,as none of the participants would have done the survey if they had to pay for it.Hence,this paper provides a solution for households with limited budgets.
文摘In most countries,buildings are responsible for significant energy consumption where space heating and air conditioning is responsible for the majority of this energy use.To reduce this massive consumption and decrease carbon emission,thermal insulation of buildings can play an important role.The estimation of energy savings following the improvement of a building’s insulation remains a key area of research in order to calculate the cost savings and the payback period.In this paper,a case study has been presented where deep retrofitting has been introduced to an existing building to bring it closer to a Passivhaus standard with the introduction of insulation and solar photovoltaic panels.The thermal performance of the building with its improved insulation has been evaluated using infrared thermography.Artificial intelligence using deep learning neural networks is implemented to predict the thermal performance of the building and the expected energy savings.The prediction of neural networks is compared with the actual savings calculated using historical weather data.The results of the neural network show high accuracy of predicting the actual energy savings with success rate of about 82%when compared with the calculated values.The results show that this suggested approach can be used to rapidly predict energy savings from retrofitting of buildings with reasonable accuracy,hence providing a practical rapid tool for the building industry and communities to estimate energy savings.A mathematical model has been also developed which has indicated a life-long monitoring will be needed to precisely estimate the benefits of energy savings in retrofitting due to the change in weather conditions and people’s behaviour.
基金the Solar Energy Laboratory of University of Macao under the projects from the sponsorship of Science and Technology Development Fund,Macao SAR(FDCT)(project reference No.FDCT/0115/2018/A3)from Research Committee of University of Macao(Nos.MYRG2017-00003-FST and M YRG2018-00018-FST).
文摘A quantitative energy leakage model was developed based on the thermography image data measured for both external and internal building surfaces.The infrared thermography images of both surfaces of doors,windows,and walls of an office building in the Hengqin Campus of University of Macao were taken at various times in a day for four seasons.The transient heat flux for sample units were obtained based on measurements of the seasonal transient local temperature differences and calculations of the effective thermal conductivity from the multiple-layer porous medium conduction model.Effects of construction unit types,orientations,and seasons were quantitatively investigated with unit transient orientation index factors.The corresponding electric energy consumption was calculated based on the air conditioning system coefficient of performance of heat pump and refrigerator cycles for different seasons.The model was validated by comparing to the electric meter records of energy consumption of the air conditioning system.The uncertainties of the predicted total building energy leakage are about 14.7%,12.8%,12.4%,and 15.8%for the four seasons,respectively.The differences between the predicted electric consumption and meter values are less than 13.4%and 5.4%for summer and winter,respectively.The typical daily thermal energy leakage value in winter is the highest among the four seasons.However,the daily electric energy consumption by the air conditioning system in summer and autumn is higher than that in winter.The present decomposition model for energy leakage is expected to provide a practical tool for quantitative analysis of energy leakage of buildings.
文摘Objective: To explore the possibility of using cortical infrared thermography (CIT) and temperature in studying the principle of acupuncture and moxibustion. Methods: The changes of the cerebral cortical temperature during electro-acupuncture (EA) measured by CIT in twenty cats were observed. By opening the skull before experiments, the cortex of animals was revealed. The distribution of the conical temperature of the awakened animals was studied by AGA infrared thermovision, and the thermograms were analysed by computer. Results: (1) The thermograms of the profile of the cortex could be displayed clearly, the temperature was higher in the ante and lower in post-cortex than that in other regions. (2) No tendency of conical temperature ascending within 30 minutes in cats without EA. (3 ) After EA, the temperature of cortex generally increased by 0.3 to 1.7 degrees centigrade, and 5 min after EA, the increment of temperature was the highest, 10 min after EA, the temperature increment was higher than before EA, but lower than 5 min after EA. The conical temperature recovered 10 min after stopping the stimulation. (4) The temperature increment was more obvious in the regions of ant. ectosylvian, ant. supra-Sylvian and ant. Sylvian than that in other regions. No matter where the site of EA was, every group had its own special region of higher temperature increment. Conclusion: The temperature increased in the cortex were mainly in the somatosensory regions. The extent and position of temperature response of cortex after EA could be displayed with CIT directly by picture. The display of the temperature response could be taken as the indication of the nervous activity. CIT could be used to conduct the studies of the acupuncture and the brain.
基金the National Natural Science Foundation of China(No.51075388)the Fundamental Research Funds for the Central Universities (No.2009KJ05)
文摘The non-destructive testing(NDT)of debonding in stainless steel composites plate(SSCP)is performed by infrared thermography,finite element analysis(FEA)software ANSYS is taken as the simulative tool,and 2D simulative model has been set up to investigate effect of the thickness of coating and/or substrate on the detectibility of debonging in SSCPs.Two parameters,namely the maximum defect temperature difference and defect appearing index,are defined to evaluate the detectivity of defects,and their computational methods and formulas are given respectively.The preliminary changing tendency of the maximum defect temperature difference and defect appearing index with the thickness of coating and/or substrate is found by numerical simulation.
基金The study was financially supported by the National Key R&D Pro-gram of China(NO.2018YFC1704600)Zhejiang Province Top Dis-cipline of Chinese Medicine(No.ZTK2017A03,No.ZTK2017A04).
文摘Background:To date,there has been a great lack of investigation on the influence of age on blood flow and temperature of acupoints in specific regions.Objective:This study aimed to determine the association between different age categories and acupoint blood flow/temperature on the forearm.Methods:Acupoint blood flow and temperature were measured in healthy adults of different age categories using laser doppler flowmetry(LDF)and infrared thermography(IRT),respectively.A total of 60 eligible healthy volunteers were divided into the young group,mid age group and old age group.All groups received LDF and IRT examination.Shenmen(HT7),Shaohai(HT3),Taiyuan(LU9)and Chize(LU5)of the Heart and Lung meridians on the forearm were selected as 4 test acupoints.Results:Regarding blood flow of the 4 test acupoints,the PU of Taiyuan(LU9)in the old age group was sig-nificantly different compared with that of the young age group(P<0.05)and the mid age group(P<0.05),while there was no significant difference in PU of the other acupoints between 3 groups(all P>0.05).Simi-larly,regarding acupoint temperature of the 4 test sites,the temperature of Shaohai(HT3)in the old age group was significantly different compared with that of the mid age group(P<0.05),while there was no significant difference in the temperature of the other 3 acupoints between 3 age groups(all P>0.05).Conclusion:Age category tends to have notable influence on the blood flow and temperature in specific acupoints in the forearm.Therefore,particular concerns should be taken into consideration regarding the effect of age differences for future studies in this field.Nevertheless,further studies with a large sample size and more test acupoints are needed to further verify current findings.
基金provided by the Special Funds for the Major State Basic Research Project(No.2006CB202200)the Innovative Team Development Project of the state Educational Ministry of China(No.IRT0656)
文摘This paper presents an overview of experimental investigations conducted at China University of Mining and Technology Beijing(CUMTB) on roadway excavation using large-scale geomechanical model tests.The simulated sedimentary rocks are composed by alternating layers of sandstone, mudstone and coal seam inclined at varied angles with respect to the horizontal including 0°, 45°, 60°, and 90°. During the excavation, infrared thermography was employed to detect the thermal response of the surrounding rocks under excavation. The obtained raw thermograms were processed using denoising algorithm, data reduction procedure and Fourier analysis. The infrared temperature(IRT) characterizes the overall rock response; the processed thermal images represent the structural behavior, and the Fourier spectrum describes damage development in the frequency domain. Deeper understanding was achieved by the comparative analyses of excavation in differently inclined rock masses using the image features of IRTs, thermal images and Fourier spectra.
基金co-financed by the European Union from the European Social Fund under the "InterDOC-STARt" project (POWR.03.02.00-00-I033/16-00) and from the Operational Programme Infrastructure and Environment under the program 2.4.4d-assessment of the state of natural resources in national parks using modern remote sensing technologies"Acquisition of multi-source remote sensing data and their analysis for the area of Wigry National Park with a part of Wigry lake and the Czarna Hańcza river" project。
文摘Background:Increasing threat to Central Europe’s forests from the growing population of the European spruce bark beetle Ips typographus (L.) calls for developing highly effective methods of detection of the infestation spots. The main goal of this study was to establish an automatic workflow for detection of dead trees and trees in poor condition of Picea abies using Middle Wave Infrared spectral range obtained from the aircraft.Methods:The studies were conducted in Wigry National Park (Poland) in 2020. A fusion of aircraft thermal data and laser scanning was used. Synchronous with thermal data acquisition ground reference data were obtained for P. abies in different health conditions. Determination of the range of canopy temperatures characteristic of the three condition states (‘healthy’,‘poor condition’,‘dead’) was performed using K-mean clustering. The accuracy of the method was evaluated on two validation sets:(1) individual tree canopies determined by photointerpretation, and (2) automatic segmentation of laser scanning data.Results:The results showed that the average temperature of ‘healthy’trees was 27.70℃, trees in ‘poor condition’28.57℃, and ‘dead’trees 30.17℃. High temperature differences between ‘healthy’and ‘dead’P. abies made it possible to distinguish these two condition classes with high accuracy. Lower accuracies were obtained for the class of ‘poor condition’, which was found to be confusing with both ‘healthy’and ‘dead’trees. According to results from the first validation set, a high overall accuracy of 0.60 was obtained. For the second validation set, the overall accuracy was reduced by 11%.Conclusions:This study indicates that canopy temperature recorded from the airborne level is a variable that differentiates ‘healthy’spruces from those in ‘poor condition’and the ‘dead’trees. The results confirmed that thermal and airborne laser scanning data fusion allows for creating a quick and simple workflow, which can successfully separate individual tree canopies and identify P. abies attacked by I. typographus. Further research is needed to identify trees in the early stages of invasion.
文摘Non-contact sensing can be a rapid and convenient alternative for determining structure response compared to conventional instrumentation.Computer vision has been broadly implemented to enable accurate non-contact dynamic response measurements for structures.This study has analyzed the effect of non-contact sensors,including type,frame rate,and data collection platform,on the performance of a novel motion detection technique.Video recordings of a cantilever column were collected using a high-speed camera mounted on a tripod and an unmanned aerial system(UAS)equipped with visual and thermal sensors.The test specimen was subjected to an initial deformation and released.Specimen acceleration data were collected using an accelerometer installed on the cantilever end.The displacement from each non-contact sensor and the acceleration from the contact sensor were analyzed to measure the specimen′s natural frequency and damping ratio.The specimen′s first fundamental frequency and damping ratio results were validated by analyzing acceleration data from the top of the specimen and a finite element model.
