基于薄膜滤波器技术的大量程光纤布拉格光栅解调方法  

A Wide Range Fiber Bragg Grating Demodulation Method Based on Thin Film Filter

作　　者：何萌[1] 刘铁根[1] 江俊峰[1] 韩憬[1] 

机构地区：[1]天津大学光电信息技术科学教育部重点实验室,天津300072

出　　处：《激光与光电子学进展》2009年第5期53-57,共5页Laser & Optoelectronics Progress

基　　金：天津市应用基础重点项目(06YFJZJC00400);国家自然科学基金(60627002);教育部博士点新教师基金(200800561020)资助项目

摘　　要：扩展了原有的薄膜滤波解调方法,提出并演示了利用粗波分复用器(CWDM)非线性阶段实现对光纤布拉格光栅(FBG)应变传感器反射的窄带光信号的大量程(8000με)解调方法。通过可调谐激光器产生精确窄带光信号,提出CWDM非线性阶段的近似方程,搭建测试系统,信号拟合程度达99.981%。同时搭建解调系统,解调精度可达3～5με。The original thin film filter demodulation method is extended and the method by utilizing the coarse wavelength division multiplexing （CWDW） nonlinear phase to realize the wide range （8000με） demodulation of the narrowband optical signal reflected by the fiber Bragg grating （FBG） strain sensor is proposed and demonstrated. Based on the precise narrowband optical signal produced by the tunable laser, the approximate equation of the CWDW nonlinear phase is proposed, the testing system is established, and the degree of fitting reaches 99.981%. The demodulation system is established, and the precision can reach 3-5με.

关 键 词：光栅 光纤布拉格光栅 薄膜滤波器 非线性 大量程 

分 类 号：TP253[自动化与计算机技术—检测技术与自动化装置]