基于光源滤波的高精度光纤光栅地震检波解调系统
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摘要
利用光纤超荧光光源在1530nm附近具有较好的线性边带做边沿滤波器进行滤波解调,并对边沿滤波和光源的工作原理进行了深入分析。由于光源波长检测灵敏度对系统解调灵敏度起决定作用,所以系统光源采用了双程后向结构,在线性边带的下降沿2.5nm范围内功率随波长变化的灵敏度为-14.7μW/nm,线性拟合度达到了0.9995。系统采用全光结构,提高了解调速度。通过对地震检波的模拟测量,解调检测波长灵敏度可达-1.27pm/mV,应变分辨力为1.06με。实验表明,该解调系统具有操作简单、灵敏度高、稳定性好、性价比高且反应速度快,可以实现对地震信号的实时检测。
The filtering demodulation is realized by using the good linear sideband near 1530 nm of the super-fluorescent fiber source.The light source of system adopts double-pass backward configuration,because the detecting sensitivity of light source decides the whole system's sensitivity.When the linear sideband is 2.5 nm,the sensitivity of power is-14.7 μW/nm,and the degree of fitting is 0.9995.The system uses all-optical structure to improve the demodulation speed.By the way of computer simulation,its detection sensitivity for the wavelength and strain separately are-1.27 pm/mV and 1.06 με.The results show that this demodulation system has high sensitivity,good stability,quick demodulation speed,and it can realize real-time detection of seismic wave.
The filtering demodulation is realized by using the good linear sideband near 1530 nm of the super-fluorescent fiber source.The light source of system adopts double-pass backward configuration,because the detecting sensitivity of light source decides the whole system's sensitivity.When the linear sideband is 2.5 nm,the sensitivity of power is-14.7 μW/nm,and the degree of fitting is 0.9995.The system uses all-optical structure to improve the demodulation speed.By the way of computer simulation,its detection sensitivity for the wavelength and strain separately are-1.27 pm/mV and 1.06 με.The results show that this demodulation system has high sensitivity,good stability,quick demodulation speed,and it can realize real-time detection of seismic wave.
引文
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3Qiao Xueguang,Wang Yu,Fu Hai weiet al..High-accuracy real time calibration of tunable Fabry-Perot filter on large range[J].Acta optica sinica,2008,28(5):852～855乔学光,王瑜,傅海威等.可调谐法布里-珀罗滤波器的高精度大范围实时定标[J].光学学报,2008,28(5):852～855
4Rao Yunjiang,Luo Xiaodong,Ran Zengling.A100km fiber Bragg grating sensor system based on swept laser and opticalamplification[J].Chinese J.Laser,2007,34(5):680～683饶云江,罗小东,冉曾令.基于扫描激光器和光放大的100km光纤布拉格光栅传感系统[J].中国激光,2007,34(5):680～683
5Xiao Hao,Li Fang,Wang Yongjieet al..High-resolutionfiber laser sensor system[J].Chinese J.Lasers,2008,35(1):87～91肖浩,李芳,王永杰等.高分辨率光纤激光传感系统[J].中国激光,2008,35(1):87～91
6M.A.Davis,A.D.Kersey.All fiber Bragg grating strain-sensor demodulation technique using a wavelength division coupler[J].Electron.Lett.,1994,30(1):75～77
7Liu Bo,Tong Zhengrong,Chen Shaohuaet al..A novel method of edge filterlinear demodulation usinglong-period gratinginfiber sensor system[J].Acta Optica Sinica,2004,24(2):199～202刘波,童峥嵘,陈少华等.一种长周期光纤光栅边沿滤波线性解调新方法[J].光学学报,2004,24(2):199～202
8Zhou Guang,Zhao Qida,Kai Guiyunet al..A novel edge filter demodulation method using high birefringence fiber Sagnac loop mirror[J].Journal of Optoelectronics.Laser,2003,14(12):1245～1249周广,赵启大,开桂云等.利用高双折射光纤环镜的边缘滤波解调方法[J].光电子.激光,2003,14(12):1245～1249
9Sheng Qiuqin,Shi Kebin,Gao Limoet 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
10Zhang Jian,Zhao Hong,Xiong Yanlinget al..A FBG sensor demodulation method based on an amplified spontaneous emission light source[J].Chinese Journal of Scientific Instrument,2006,27(1):102～105张剑,赵洪,熊燕玲等.应用放大自发辐射光源解调光纤光栅传感器[J].仪器仪表学报,2006,27(1):102～105
11Xiao Mengben,Xiong Yanling,Zhao Hong.Afiber Bragg grating strain sensor based on ASElight source demodulationtechnology[J].Journal Harbin Univ.Sci.&Tech.,2006,11(1):30～32肖孟本,熊燕玲,赵洪.基于ASE光源解调的光纤光栅应变传感器[J].哈尔滨理工大学学报,2006,11(1):30～32
12Xu Ning.FBG dynamic demodulation and its applications[D].Haerbin:Harbin University of Science and Technology.2006:34～49徐宁.光纤光栅传感技术动态解调方法及其应用[D].哈尔滨:哈尔滨理工大学.2006:34～49
13Guo Xiaodong,Qiao Xueguang,Jia Zhenanet al..Anovel C+L band erbium-doped fiber roadband light source with high power[J].Chinese J.Lasers,2005,32(5):609～612郭小东,乔学光,贾振安等.一种C+L波段高功率掺铒光纤宽带光源[J].中国激光,2005,32(5):609～612
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