基于光源滤波的高精度光纤光栅地震检波解调系统  

High Precision Optical Fiber Bragg Grating Demodulation System Based on the Source Filtering for Seismic Detection

作　　者：乔学光[1,2] 丁锋[1] 贾振安[1] 宋娟[1] 

机构地区：[1]西安石油大学光电油气测井与检测教育部重点实验室,陕西西安710065 [2]西北大学,陕西西安710069

出　　处：《光学学报》2010年第8期2219-2223,共5页Acta Optica Sinica

基　　金：国家自然科学基金(60727004;60654001);国家863计划(2007AA03Z413;2006AA06Z210);教育部科技创新工程重大项目(Z08119);中石油创新基金(2008D-5006-03-08)资助课题

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.

关 键 词：光纤光学 地震检波解调 边沿滤波 光纤光源 

分 类 号：TN253[电子电信—物理电子学]