基于CLPG的FBG监测系统及其应用.pdfVIP

学兔兔 第33卷 第7期 仪 器 仪 表 学 报 Vo1．33 No．7 2012年7月 Chinese Journal of Scientific Instrument Ju1．2012 基于CLPG的FBG监测系统及其应用 邹红波 ，孙水发 ，吉培荣 (1三峡大学电气与新能源学院 宜昌 443002；2三峡大学智能视觉与图像信息研究所 宜昌 443002) 摘 要：为了实现可变体机翼的结构健康监测，提出了一种基于级联长周期光栅(cascaded long—period fiber grating，CLPG)的光 纤Bragg光栅(fiber Bragg grating，FBG)监测系统。该监测系统以FBG为传感元件，以CLPG为边沿滤波器件，经CLPG调制后 FBG反射光功率会发生变化，通过对FBG谐振波长处光功率的探测，从而实现FBG传感信号的监测。监测系统具有结构简单、 成本低、解调速度快等优点。利用该监测系统对某型可变体机翼进行结构健康监测，结果表明该监测系统的应变分辨率为2 ￡，实验结果与有限元分析结果相符，最小误差仅为3．27％，表明该监测系统能够用于可变体机翼的结构健康监测。 关键词：级联长周期光栅；光纤Bragg光栅；可变体机翼；结构健康监测 中图分类号：TP212 文献标识码：A 国家标准学科分类代码：420．40 FBG interrogation system based on CLPG and its application Zou Hongbo’ Sun Shuifa ，ji Peirong ， ( College of Electric Engineering and Renewable Energy，Three Gorges University，Yichang 443002，China； 2 Institute ofIntelligent Vision and Image Information，Three Gorges University，Yichang 443002，China) Abstract：To realize structural health monitoring(SHM)of morphing wing，a fiber Bragg grating(FBG)interroga- tion system based on a cascaded long-period fiber grating(CLPG)is proposed in this article．The FBG is used as a sensor and the CLPG is used as an edge filter in this interrogation system．The power of the reflected light of the FBG after being modulated by the CLPG would change；SO the sensing signal monitoring of the FBG is realized through de— tecting the transmission power at the resonant wavelength of the FBG．This system has the advantages such as simple structure，low cost，fast speed demodulation and ete．This system was utilized for the SHM of a certain kind of nor- phing wing．The result shows that the strain resolution