中国激光, 2008, 35 (s2): 254, 网络出版: 2009-01-05
一种光纤布拉格光栅动态解调系统的研究
Research on Dynamic Demodulating Technique for Fiber Grating Sensor System
光栅 动态解调 边缘滤波 长周期光栅 gratings dynamic demodulating linear demodulation dynamic demodulating long-period fiber grating
摘要
设计并实现了一种基于长周期光栅边缘滤波特性解调光纤布拉格光栅(FBG)的动态应变检测系统。研究了当试件加载垂直周期力时FBG受到的动态响应特性。将FBG作为传感元件, 利用长周期光栅(LPFG)边缘滤波特性对光强调制, 长周期光栅的透射光信号经光电转换获得电压信号, 通过数采卡与LabView软件设计结合由计算机采集。根据试验结果, 获取信号的时域波形图并进行频谱分析。结果表明, 该系统采集的信号能够较好地反映施加振动载荷的频谱特征, 并实现了3 kHz频率以下的动态应变测量, 波长分辨极限达到0.004 nm。
Abstract
A dynamic-strain demodulating system based on a fiber Bragg grating (FBG) filtering is proposed and experimentally demonstrated.The FBG is glued onto the experimental laminate as smart material to monitor the structure vibration. Edge filtering of long-period fiber grating (LPFG) is used to demodulate FBG with light intensity. Throgh the connection of data collect card and LabView software, the voltage signal is transported to computer. Through the experiment, this system have a nice performance to reflect the exciting frequency. The vibration frequency up to 3 kHz can be realized and the wavelength resolving power is 0.004 nm in minimal.
朱珠, 曾捷, 梁大开, 何仁. 一种光纤布拉格光栅动态解调系统的研究[J]. 中国激光, 2008, 35(s2): 254. Zhu Zhu, Zeng Jie, Liang Dakai, He Ren. Research on Dynamic Demodulating Technique for Fiber Grating Sensor System[J]. Chinese Journal of Lasers, 2008, 35(s2): 254.
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