基于双长周期光纤光栅边缘滤波的光纤布拉格光栅解调系统  

Double-Edged Filter Wavelength Demodulation System for Fiber Bragg Gratings Based on Long Period Fiber Grating

作　　者：朱珠[1] 梁大开[2] 孙红兵[1] 

机构地区：[1]淮阴师范学院电子与电气工程系,江苏淮安223300 [2]南京航空航天大学机械结构力学与控制国家重点实验室,江苏南京210016

出　　处：《中国激光》2013年第3期110-116,共7页Chinese Journal of Lasers

基　　金：江苏省高校科研成果化推进项目(JH-009);淮安市科技发展项目(HAG2011046)资助课题

摘　　要：从长周期光纤光栅(LPFG)透射光谱和光纤布拉格光栅(FBG)解调原理角度,详细研究了LPFG透射光谱的边缘滤波特性,提出了一种基于双长周期光纤光栅边缘滤波的FBG解调方案,使其在具有对被测参量变化高度灵敏性特点的同时,对温度、湿度等环境参量具有较好的自补偿性能,并对该方案进行了温度、振动信号监测验证。通过理论和实验验证,该解调方法对静、动态信号具有较好的响应特性,其动态信号的响应带宽约为3kHz,在580,1000,2500Hz的激励频率下,该系统具有较好的响应度和精确度,符合结构健康监测领域对FBG解调的要求,具有广泛的应用前景。From the angle of the interrogation technology for fiber transmission spectrum of long period fiber grating （LPFG） and the wavelength Bragg gratings （FBGs）, the edged filter double-edged filter wavelength interrogation technology for FBGs is proposed the experiments of temperature and vibration signal monitoring are verified characteristic of LPFGs is studied. A The theoretical model is deduced and The demodulation system, which is repeatedly tested under the excitation frequency of 580, 1000 Hz and 2500 Hz, respectively, shows broad dynamic frequency band of 3 kHz, fast response time and high accuracy, with the extensive application prospects.

关 键 词：光栅 长周期光纤光栅 光纤布拉格光栅 解调 边缘滤波 振动信号监测 

分 类 号：TN247[电子电信—物理电子学]