基于F-P标准具和Music算法的FBG动态应变传感系统  

A FBG Sensor System for Dynamic Strain Measurement Based on F-P Etalon and Music Algorithm

作　　者：卢婧[1] 饶云江[1,2] 冉曾令[1] 

机构地区：[1]电子科技大学通信与信息工程学院宽带光纤传输和通信网技术教育部重点实验室,成都610054 [2]重庆大学光电工程学院光电技术与系统教育部重点实验室,重庆400044

出　　处：《光电工程》2010年第4期93-96,共4页Opto-Electronic Engineering

基　　金：国家自然科学基金重点资助项目(60537040)

摘　　要：提出了基于可调光纤环形激光器结构,并采用F-P标准具解调的光纤布拉格光栅(FBG)动态应变传感系统,具有高达60dB的光学信噪比。F-P标准具用来作为一个边缘滤波器探测FBG波长的漂移,这样的解调方式具有稳定性高的优点。为了提高动态应变测量系统的分辨率,采用了Music算法进行频谱分析。实验结果显示,在700Hz时的动态应变分辨率达到了0.1με/Hz1/2,是传统FFT算法的10倍。A sensing system with a high optical Signal Noise Ratio （SNR） of 60 dB, which is based on a tunable fiber ring laser configuration, is proposed for the dynamic strain measurement. An F-P etalon serving as edge filter is used to detect the wavelength shift of the Fiber Bragg Grating （FBG） sensor. Such a demodulation device has the advantage of stability. In addition, in order to improve the resolution for dynamic strain measurement, a modern spectral analyzing algorithm called Music modern spectrum estimation is adopted. The experimental results show that a dynamic strain resolution of 0.1 με/Hz1/2 at 700 Hz is obtained, which is 10 times better in terms of strain resolution compared with conventional FFT method.

关 键 词：光纤布拉格光栅(FBG) 光纤环形激光器 动态应变 MUSIC算法 

分 类 号：TN253[电子电信—物理电子学]