具有温度补偿功能的双匹配FBG振动传感系统研究
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摘要
为了提高光纤Bragg光栅(FBG)振动传感系统的解调灵敏度和解调范围,消除环境温度对解调信号的影响,设计了一种具有温度补偿功能的双匹配FBG振动传感系统。系统采用两个中心波长对称地位于传感FBG两侧的透射式匹配FBG,建立了两个互补对称的传感通道,并利用差分原理实现振动传感。通过Matlab软件对系统性能进行了仿真分析,结果表明,与传统方法相比,本文方法有效地提高了系统解调灵敏度和解调范围。将匹配FBG与热电制冷器(TEC)集成封装,并建立温度补偿判断通道,当判断通道输出电压超过已设置好的阈值时,利用TEC改变封装环境温度,使匹配FBG与传感FBG中心波长重新匹配,实现系统温度补偿。经实验测试,系统的归一化解调灵敏度为5.168/nm,解调范围为1.2nm,判断通道的归一化阈值电压为0.890 5。在4种不同环境温度下,利用本系统对同一振动信号进行测量,实验结果验证了系统温度补偿的可行性。
In order to improve the demodulation sensitivity and range of fiber Bragg grating(FBG)vibration demodulation system and eliminate the influence of ambient temperature on demodulation signal,a fiber Bragg grating vibration demodulation system with temperature compensation is developed.Using two transmission mode matching FBGs with center wavelengths symmetrically located at both sides of that of the sensing FBG,two symmetrical and complementary sensing channels are established in the system and then the vibration demodulation is realized based on difference principle.The system performance is simulated by Matlab software and the results show that compared with traditional method,the proposed method can effectively improve the demodulation sensitivity and range of the system.The matching FBGs are packaged together with a thermoelectric cooler(TEC)and a judging channel of temperature compensation is established.When the output of judging channel exceeds the threshold set previously for temperature regulation judgment,the center wavelengths of matching FBGs are re-matched with the sensing FBG by changing the package temperature of matching FBGs with TEC controller,thereby realizing the temperature compensation of the system.The experimental results show that the normalized system demodulation sensitivity is 5.168/nm,the demodulation range is 1.2nm,and the normalized threshold voltage of judging channel is 0.8905.The feasibility of system temperature compensation and judgment mechanism is demonstrated by measurement of the same vibration signal under four different environment temperatures using the developed demodulation system
In order to improve the demodulation sensitivity and range of fiber Bragg grating(FBG)vibration demodulation system and eliminate the influence of ambient temperature on demodulation signal,a fiber Bragg grating vibration demodulation system with temperature compensation is developed.Using two transmission mode matching FBGs with center wavelengths symmetrically located at both sides of that of the sensing FBG,two symmetrical and complementary sensing channels are established in the system and then the vibration demodulation is realized based on difference principle.The system performance is simulated by Matlab software and the results show that compared with traditional method,the proposed method can effectively improve the demodulation sensitivity and range of the system.The matching FBGs are packaged together with a thermoelectric cooler(TEC)and a judging channel of temperature compensation is established.When the output of judging channel exceeds the threshold set previously for temperature regulation judgment,the center wavelengths of matching FBGs are re-matched with the sensing FBG by changing the package temperature of matching FBGs with TEC controller,thereby realizing the temperature compensation of the system.The experimental results show that the normalized system demodulation sensitivity is 5.168/nm,the demodulation range is 1.2nm,and the normalized threshold voltage of judging channel is 0.8905.The feasibility of system temperature compensation and judgment mechanism is demonstrated by measurement of the same vibration signal under four different environment temperatures using the developed demodulation system
引文
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[13]Rao Y J,Kalli K,Brady G.Spatially-multiplexed fiber-optic Bragg grating strain and temperature sensor system based on interferometric wavelength-shift detection[J].Electronics Letters,1995,31(12):1009-1010.
[14]LIU Yun-qi,LIU Zhi-guo,GUO Zhuanyun,et al.Theoretical and experimental researches on tunable filtering detection technique of fiber grating sensor[J].Acta Optica Sinica,2001,21(1):88-92.刘云启,刘志国,郭转运,等.光纤光栅传感器的调谐滤波检测技术[J].光学学报,2001,21(1):88-92.
[15]LI Yong-qian,WANG Yu,YAO Guo-zhen.Comparative analysis of FBG vibration sensing demodulation methods[J].Study on Optical Communication,2014,(4):46-50.李永倩,王宇,姚国珍.光纤光栅振动解调方法对比分析[J].光通信研究,2014,(4):46-50.
[16]WANG Shan-li,XIANG Guang-hua,HU Man-li,et al.Design of a novel FBG vibration sensor[J].Journal of Optoelectronics·Laser,2011,22(4):515-519.王善鲤,向光华,忽满利,等.一种新型光纤Bragg光栅振动传感器的设计[J].光电子·激光,2011,22(4):515-519.
[2]ZHANG Fa-xiang,ZHANG Xiao-lei,WANG Lu-jie,et al.Study on FBG micro-seismic geophone with high sensitivity and broad bandwidth[J].Journal of Optoelectronics·Laser,2014,25(6):1086-1091.张发祥,张晓磊,王路杰,等.高灵敏度大带宽光纤光栅微地震检波器研究[J].光电子·激光,2014,25(6):1086-1091.
[3]ZHAO Hong-xia,CHENG Pei-hong,BAO Ji-long,et al.Strain and temperature simultaneous measurement using a two-section FBG[J].Journal of Optoelectronics·Laser,2014,25(6):1071-1074.赵洪霞,程培红,鲍吉龙,等.一种两段式FBG应变和温度同步测量的实现[J].光电子·激光,2014,25(6):1071-1074.
[4]WANG Hong-liang,ZHOU Hao-qiang,GAO-Hong,et al.Fiber grating acceleration vibration sensor with double uniform strength cantilever beams[J].Journal of Optoelectronics·Laser,2013,24(4):635-641.王宏亮,周浩强,高宏,等.基于双等强度悬臂梁的光纤光栅加速度振动传感器[J].光电子·激光,2013,24(4):635-641.
[5]Hernández-Serrano A I,Salceda-Delgado G,MorenoHernández D,et al.Robust optical fiber bending sensor to measure frequency of vibration[J].Optics and Lasers in Engineering,2013,51(9):1102-1105.
[6]Perry M,Orr P,Niewczas P,et al.Nanoscale resolution interrogation scheme for simultaneous static and dynamic fiber Bragg grating strain sensing[J].Journal of Lightwave Technology,2012,30(20):3252-3258.
[7]WANG Ju-feng,ZHUANG Lin-ling,LIU Shi-wei,et al.Investigation on the filter properties of dual-differential Sagnac loop for FBG demodulation with high temperature stability[J].Journal of Optoelectronics·Laser,2014,25(8):1455-1460.王巨锋,庄琳玲,刘士伟,等.用于FBG信号解调的Sagnac环双差动滤波特性研究[J].光电子·激光,2014,25(8):1455-1460.
[8]WANG Yan,LIANG Da-kai,HU Xing-liu,et al.Design and realization of LPFG power demodulation system with temperature compensation[J].Journal of Optoelectronics·Laser,2013,24(6):1048-1052.王彦,梁大开,胡兴柳,等.具有温度补偿的LPFG功率解调系统的设计与实现[J].光电子·激光,2013,24(6):1048-1052.
[9]SHENG Qiu-qin,SHI Ke-bin,GAO Li-mo,et al.Study on the method of matching detection of fiber grating vibration sensor[J].Acta Optica Sinica,2002,22(7):847-851.盛秋琴,施可彬,高立模,等.光纤光栅振动传感匹配检测方法的研究[J].光学学报,2002,22(7):847-851.
[10]ZHAN Ya-ge,LU Qing,XIANG Shi-qing,et al.Study on the optimization of matched grating interrogation technique of fiber grating sensor[J].Acta Photonica Sinica,2004,33(6):711-715.詹亚歌,陆青,向世清,等.优化光纤光栅传感器匹配光栅解调方法的研究[J].光子学报,2004,33(6):711-715.
[11]ZHAI Yu-feng,ZHANG Long,LI Fei,et al.Study on temperature compensation for matched grating interrogation system[J].Acta Photonica Sinica,2008,37(7):1365-1368.翟玉锋,张龙,李飞,等.动态匹配光栅解调传感系统温度补偿研究[J].光子学报,2008,37(7):1365-1368.
[12]SUN Hua,LIU Bo,ZHOU Hai-bin,et al.A novel FBG high frequency vibration sensor based on Equi-intensity cantilever beam[J].Chinese journal of sensor and actuators,2009,22(9):1270-1275.孙华,刘波,周海滨,等.一种基于等强度梁的光纤光栅高频振动传感器[J].传感技术学报,2009,22(9):1270-1275.
[13]Rao Y J,Kalli K,Brady G.Spatially-multiplexed fiber-optic Bragg grating strain and temperature sensor system based on interferometric wavelength-shift detection[J].Electronics Letters,1995,31(12):1009-1010.
[14]LIU Yun-qi,LIU Zhi-guo,GUO Zhuanyun,et al.Theoretical and experimental researches on tunable filtering detection technique of fiber grating sensor[J].Acta Optica Sinica,2001,21(1):88-92.刘云启,刘志国,郭转运,等.光纤光栅传感器的调谐滤波检测技术[J].光学学报,2001,21(1):88-92.
[15]LI Yong-qian,WANG Yu,YAO Guo-zhen.Comparative analysis of FBG vibration sensing demodulation methods[J].Study on Optical Communication,2014,(4):46-50.李永倩,王宇,姚国珍.光纤光栅振动解调方法对比分析[J].光通信研究,2014,(4):46-50.
[16]WANG Shan-li,XIANG Guang-hua,HU Man-li,et al.Design of a novel FBG vibration sensor[J].Journal of Optoelectronics·Laser,2011,22(4):515-519.王善鲤,向光华,忽满利,等.一种新型光纤Bragg光栅振动传感器的设计[J].光电子·激光,2011,22(4):515-519.
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