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采场覆岩离层演化的光纤光栅检测实验研究 被引量:7
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作者 柴敬 王帅 +2 位作者 袁强 姜德君 李毅 《西安科技大学学报》 CAS 北大核心 2015年第2期144-151,共8页
为定量化研究采场上覆岩层离层规律,采用相似材料物理模型试验的方法模拟煤矿回采过程,用光纤光栅传感技术构建相似材料物理模型实验的覆岩移动的监测方法和系统。实验制作了一个3 m×1.19 m×0.2 m的相似材料平面模型,几何相... 为定量化研究采场上覆岩层离层规律,采用相似材料物理模型试验的方法模拟煤矿回采过程,用光纤光栅传感技术构建相似材料物理模型实验的覆岩移动的监测方法和系统。实验制作了一个3 m×1.19 m×0.2 m的相似材料平面模型,几何相似比为1∶200,同时在模型内埋设9个光纤光栅应变传感器和1个光纤光栅温度传感器,用以研究模型开挖过程中覆岩运移状态与光纤光栅传感器测试结果的对应关系。实验结果表明,光纤光栅传感器应变量与岩层运移状态密切相关。传感器所在岩层层位发生离层时,传感器受拉应力作用使其应变量发生跃升,而后由于离层不再扩展而保持平稳,直至离层破断垮落。通过光纤光栅检测方法可以定量化描述传感器所处岩层离层变化量的大小。 展开更多
关键词 采场 离层 相似材料物理模型实验 光纤光栅检测方法
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Research on Optical Fiber Flow Test Method With Non-Intrusion 被引量:2
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作者 Ying SHANG 《Photonic Sensors》 SCIE EI CAS 2014年第2期132-136,共5页
In the field of oil well logging, real-time monitoring of the fluid flow parameter provides a scientific basis for oil and gas optimization exploration and increase in reservoir recovery, so a non-intrusive flow test ... In the field of oil well logging, real-time monitoring of the fluid flow parameter provides a scientific basis for oil and gas optimization exploration and increase in reservoir recovery, so a non-intrusive flow test method based on turbulent vibration was proposed. The specific length of the sensor fiber wound tightly around the outer wall of the pipe was connected with the optical fiber gratings at both ends, and the sensor fiber and the optical fiber gratings composed the flow sensing unit. The dynamic pressure was generated by the turbulence when fluid flows through the pipe, and the dynamic pressure resulted in the light phase shift of the sensor fiber. The phase information was demodulated by the fiber optic interferometer technology, time division multiplexing technology, and phase generated carrier modulation and demodulation techniques. The quadratic curve relationship between the phase change and flow rate was found by experimental data analysis, and the experiment confirmed the feasibility of the optical fiber flow test method with non-intrusion and achieved the real-time monitoring of the fluid flow. 展开更多
关键词 IL flow turbulent vibration the fiber optic interferometer phase generated carrier
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FBG Stress-Sensibilized Monitor for Railway Switch Pole On-Line Monitoring
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作者 Weilai LI Jie LIU +2 位作者 Jianjun PAN Jin PANG Xiaoshan LU 《Photonic Sensors》 SCIE EI CAS 2014年第3期269-273,共5页
The fiber Bragg grating (FBG) sensing technology is used to dynamically monitor multiple parameters of railway switch machine poles, including time of movement, direction and quantity of loading and locking force, a... The fiber Bragg grating (FBG) sensing technology is used to dynamically monitor multiple parameters of railway switch machine poles, including time of movement, direction and quantity of loading and locking force, and states of loading resistance. This paper presents the design and implementation of a railway switch pole strain on-line monitoring system based on the FBG stress-sensibilized monitor for a Siemens S700K switch machine. The ring shape FBG strain gauge and stress-sensibilized methods significantly increased the monitoring sensitivity. Installing approaches adapted the harsh environment in the railway application. The monitoring results showed the high sensitivity and high reliability of this monitoring system. This application provides a long-term and on-line detecting method which could meet railway switch condition monitoring demands of more than 100,000 switch machines in the country. 展开更多
关键词 Fiber Bragg grating railway switch POLE strain dynamically monitor
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