基于光纤光栅的煤矿瓦斯压力传感器的研制
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摘要
针对煤层瓦斯压力不能多点同步测量问题,提出一种基于弹性膜片的光纤光栅(fiber bragg grating,FBG)瓦斯压力传感器设计方案。采用膜片与腔体一体、光纤首尾开放的结构模式,并对封装后的传感器进行试验研究,针对FBG瓦斯压力传感器存在的温度-应力交叉敏感问题,进行了交叉敏感分析以及算法补偿,并对该传感器分别进行压力试验标定和温度影响试验标定。试验结果表明,该传感器压力范围0~10 MPa,温度灵敏度系数27.01 pm/℃,温度补偿后的压力灵敏度系数251.88 pm/MPa,与理论值接近。该传感器的结构模式可以有效避免安装误差和迟滞误差所带来的影响,同时便于组链开展多点分布式测量。
A design scheme of Fiber Bragg Grating(FBG) gas pressure sensor based on elastic diaphragm is proposed for multi-point simultaneous measurement on coal seam gas pressure. The sensor adopted the diaphragm and cavity as a whole and the fiber adopted the open-end mode,and the encapsulated sensor was used to do experimental research. Aiming at the temperature-stress cross-sensitivity problem of FBG pressure sensors,the solution of the temperature compensation was studied,and the sensor was calibrated by pressure experiment and temperature experiment. The experimental results show that the temperature sensitivity coefficient of FBG pressure sensor is 27. 01 pm/℃ at the pressure range of 0 ~ 10 MPa,the pressure sensitivity coefficient after warming is 251. 88 pm/MPa,which is close to the theoretical value. The structure of the sensor can effectively avoid the influence of installation error and hysteresis error and is convenient for achieving multi-point distributed measurement of group chains.
A design scheme of Fiber Bragg Grating(FBG) gas pressure sensor based on elastic diaphragm is proposed for multi-point simultaneous measurement on coal seam gas pressure. The sensor adopted the diaphragm and cavity as a whole and the fiber adopted the open-end mode,and the encapsulated sensor was used to do experimental research. Aiming at the temperature-stress cross-sensitivity problem of FBG pressure sensors,the solution of the temperature compensation was studied,and the sensor was calibrated by pressure experiment and temperature experiment. The experimental results show that the temperature sensitivity coefficient of FBG pressure sensor is 27. 01 pm/℃ at the pressure range of 0 ~ 10 MPa,the pressure sensitivity coefficient after warming is 251. 88 pm/MPa,which is close to the theoretical value. The structure of the sensor can effectively avoid the influence of installation error and hysteresis error and is convenient for achieving multi-point distributed measurement of group chains.
引文
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[12]张登攀,郑艳,王8),等.FBG温度传感器交叉敏感问题的研究[J].大气与环境光学学报,2016,11(3):226-233.ZHANG D P,ZHENG Y,WANG J,et al.Investigation of cross-sensitivity of fiber Bragg grating temperature sensor[J].Journal of atmospheric and Environmental Optics,2016,11(3):226-233.
[13]殷小峰,姜暖,杨华勇,等.基于弹性薄片封装的高灵敏度光纤光栅压力传感器[J].光电子·激光,2011,22(5):681-684.YIN X F,JIANG N,YANG H Y,et al.A novel fiber grating pressure sensor with high sensitivity based on elastic sheet packaging[J].Journal of Optoelectronics·Laser,2011,22(5):681-684.
[14]罗裴.膜片式光纤光栅压力传感器的灵敏度分析[J].机电工程技术,2011,40(5):65-66+78.LUO P.Study on Sensitivity of Membrane-Type Fiber Bragg Grating Pressure Sensor[J].MECHANICAL&ELECTRICAL ENGINEERING TECHNOLOGY,2011,40(5):65-66+78.
[15]胡志新,王震武,马云宾,等.温度补偿式光纤光栅土压力传感器[J].应用光学,2010,31(1):110-113.HU Z X,WANG Z W,MA Y B,ZHANG J.Soil pressure sensor based on temperature compensation FBG[J].Journal o f Applied Optics,2010,31(1):110-113.
[2]邹银辉,张庆华.我国煤矿井下煤层瓦斯含量直接测定法的技术进展[J].矿业安全与环保,2009,36(s1):180-182.ZOU Y H,ZHANG Q H.Technical progress of direct determination of gas content in coal seam in coal mines of China[J].Mining Safety&Environmental Protection,2009,36(s1):180-182.
[3]程远平.煤矿瓦斯防治理论与工程应用[M].徐州:中国矿业大学出版社,2010.CHENG Y P.Theory and engineering application of gas prevention and control in coal mine[M].Xuzhou:China University of Mining and Technology Press,2010.
[4]张自嘉.光纤光栅理论基础与传感技术[M].北京:科学出版社,2009.ZHANG Z J.Theoretical basis and sensing technology of fiber Bragg gratings[M].Beijing:Science Press,2009.
[5]GUEMES J A,MENéNDEZ J M.Response of Bragg grating fiber-optic sensors when embedded in composite laminates[J].Composites Science&Technology,2002,62(7):959-966.
[6]TORRES B,PAY-ZAFORTEZA I,CALDERN P A,et al.Analysis of the strain transfer in a new FBG sensor for Structural Health Monitoring[J].Engineering Structures,2011,33(2):539-548.
[7]WONG A C L,CHILDS P A,PENG G D.Multiplexed fibre Fizeau interferometer and fibre Bragg grating sensor system for simultaneous measurement of quasi-static strain and temperature using discrete wavelet transform[J].Measurement Science&Technology,2006,17(2):384.
[8]赵勇.光纤光栅及其传感技术[M].北京:国防工业出版社,2007.ZHAO Y.Fiber Bragg grating and its sensing technology[M].Beijing:National Defense Industry Press,2007.
[9]AHMAD H,HARUN S W,CHONG W Y,et al.Highsensitivity pressure sensor using a polymer-embedded FBG[J].Microwave&Optical Technology Letters,2008,50(1):60-61.
[10]AHMAD H,CHONG W Y,THAMBIRATNAM K,et al.High Sensitivity Fiber Bragg Grating Pressure Sensor Using Thin Metal Diaphragm[J].2010,9(12):1654-1659.
[11]LIU Y,GUO Z,YING Z,et al.Simultaneous pressure and temperature measurement with polymer-coated fibre Bragg grating[J].Electronics Letters,2000,36(6):564-566.
[12]张登攀,郑艳,王8),等.FBG温度传感器交叉敏感问题的研究[J].大气与环境光学学报,2016,11(3):226-233.ZHANG D P,ZHENG Y,WANG J,et al.Investigation of cross-sensitivity of fiber Bragg grating temperature sensor[J].Journal of atmospheric and Environmental Optics,2016,11(3):226-233.
[13]殷小峰,姜暖,杨华勇,等.基于弹性薄片封装的高灵敏度光纤光栅压力传感器[J].光电子·激光,2011,22(5):681-684.YIN X F,JIANG N,YANG H Y,et al.A novel fiber grating pressure sensor with high sensitivity based on elastic sheet packaging[J].Journal of Optoelectronics·Laser,2011,22(5):681-684.
[14]罗裴.膜片式光纤光栅压力传感器的灵敏度分析[J].机电工程技术,2011,40(5):65-66+78.LUO P.Study on Sensitivity of Membrane-Type Fiber Bragg Grating Pressure Sensor[J].MECHANICAL&ELECTRICAL ENGINEERING TECHNOLOGY,2011,40(5):65-66+78.
[15]胡志新,王震武,马云宾,等.温度补偿式光纤光栅土压力传感器[J].应用光学,2010,31(1):110-113.HU Z X,WANG Z W,MA Y B,ZHANG J.Soil pressure sensor based on temperature compensation FBG[J].Journal o f Applied Optics,2010,31(1):110-113.