摘要
化工产业是国家经济发展的基础,但其在促进经济发展的同时也面临着高碳排放、环境污染和安全风险等挑战。为了保障化工园区的平稳运行,团队研制了一套全光纤体制的1.5μm大气多参数激光雷达系统,并应用于化工园区的污染强度、气体浓度、风场和降雨信息的监测和预警。该激光雷达系统集成了直接探测模块和相干探测模块,在直接探测模块中,基于扫描光源和超导纳米线单光子探测器进行气体浓度的监测。在相干探测模块中,基于对距离修正回波信号、载噪比和多普勒频移的分析获得颗粒物污染强度和风场分布;基于湍流动能耗散率和风廓线的速度梯度获得湍流和风切变信息;基于深度功率谱分析获得谱宽和偏度,用于区分风速和雨速,获得精准的降雨信息。大气多参数激光雷达分别在江苏省南京市江北新区和内蒙古自治区鄂尔多斯自治旗棋盘井镇进行外场实验,通过多次实验验证了该大气多参数激光雷达在化工园区进行环保、安全和精细化气象保障的能力。文中还进一步设计展望了该系统在化工园区探测多种危化气体浓度的潜力。
Objective The chemical industry occupies an important position in the national economy.However,it is also facing challenges such as environmental pollution,carbon dioxide emission,resource consumption and safety risks.Therefore,it is particularly important to develop remote sensing technology that can monitor pollutant discharge,dangerous gas leakage,wind and rain and other meteorological elements in chemical parks with high sensitivity,high stability,wide range and continuous day and night monitoring.In recent years,1.5μm lidar has been regarded as an important detection means for the detection of atmospheric environment and atmospheric parameters due to its advantages of human eye safety,continuous day and night observation,high spatial and temporal resolution,all-fiber integration,low power consumption and high stability.At present,differential absorption lidar(DIAL)has been used to detect the concentration distribution and flux emission of various greenhouse gases and dangerous gases,while coherent wind lidar(CDWL)is also widely used to detect atmospheric multiple parameters such as wind field,aerosol and precipitation.Lidar has gradually become one of the important means of safety and environmental protection monitoring in chemical parks.For this purpose,atmospheric multi-parameter detection lidar is applied in the field of safety and environmental protection in chemical industry park.Methods For simultaneous detection of aerosols,gases,and wind fields,we built an atmospheric multiparameter lidar system integrating direct detection module and coherent detection module(Fig.1 and Tab.1).The outgoing light source uses a tunable external cavity semiconductor laser(ECDL)as the detection light source(On wavelength laser)and a fiber laser as the reference light source(Off wavelength laser).the ECDL's outgoing frequency is locked by the optical frequency comb.The receiving system consists of two parts:direct detection module and coherent detection module.In direct detection module,the signal is detected by a large area superconducting nanowire single photon detector(SNSPD).Gas detection requires high sensitivity,and SNSPD provides a higher signal-to-noise ratio than coherent detection techniques.In coherent detection module,the backscattered signal is coupled with the local oscillator light and detected by a balanced detector.In this system,direct detection module uses differential absorption technology of molecular spectrum for gas detection,and coherent detection module uses range correction echo signal,doppler frequency shift,turbulent kinetic energy dissipation rate(TKEDR),the velocity gradient of wind profiles and power spectrum deep analysis technology for pollutant,wind,rain,turbulence and wind shear.Results and Discussions Firstly,by combining the detection results of range correction echo signal PR^(2)and wind vector,the atmospheric multi-parameter lidar can be used for the early warning and monitoring of pollutant emission tracing and diffusion.The stability of monitoring and the accuracy of tracing are verified by experiments(Fig.2-3).Then,the accuracy and stability of carbon dioxide monitoring by the atmospheric multi-parameter lidar were verified through long-term and large-scale monitoring experiments on CO_(2)distribution in chemical industry park(Fig.4-6).Finally,in view of the simultaneous detection of wind and rain by CDWL,the atmospheric multi-parameter lidar is applied to the fine meteorological support of the chemical industry park,and the meteorological observation capability of the atmospheric multi-parameter lidar is verified by observation experiments.(Fig.7).Conclusion and Prospect A set of atmospheric multi-parameter lidar integrated with direct detection and coherent detection is applied to the safety and environmental protection of chemical parks.In general,the atmospheric multi-parameter lidar has a good application prospect in the field of safety and environmental protection in the chemical industry park,which can accurately and stably achieve tracing of pollutant emissions,monitoring gases,and refined meteorological support.The application of atmospheric multi-parameter lidar in chemical industry park can effectively improve the level of environmental protection and optimize the ability of safety management,and realize the sustainable development of chemical industry park.Due to the use of scanning light sources,it is theoretically possible to achieve the detection of a variety of gases.(Tab.2)In the future,we will use atmospheric multi-parameter lidar to detect a variety of dangerous gases in the chemical park,and plan to integrate polarization detection capabilities on atmospheric multi-parameter lidar to enhance pollutant and gas classification capabilities.
作者
夏秋炜
章振
余赛芬
夏海云
潘凡峰
Xia Qiuwei;Zhang Zhen;Yu Saifen;Xia Haiyun;Pan Fanfeng(School of Atmospheric Physics,Nanjing University of Information Science and Technology,Nanjing 210044,China;National Center of Carbon Metrology(Fujian),Nanping 353011,China;Fujian Ruitan Optoelectronic Precision Instrument Co.,Ltd.,Nanping 353011,China)
出处
《红外与激光工程》
EI
CSCD
北大核心
2024年第5期151-163,共13页
Infrared and Laser Engineering
基金
科技部重点研发计划项目(2022YFF0606400)
国家自然科学基金项目(42305147)
江苏省基础研究计划自然科学基金项目(BK20230428)。
关键词
激光雷达
化工园区
环境监测
大气遥感
lidar
chemical industry park
environmental monitoring
atmospheric remote sensing
