高精度准分布式光纤光栅传感系统的研究  

Study on high accuracy quasi-distributed fiber grating sensor system

作　　者：詹亚歌[1] 吴华[1] 裴金诚[2] 杨熙春[2] 薛绍林[1] 

机构地区：[1]东华大学应用物理系,上海201620 [2]中国科学院上海光学精密机械研究所,上海201800

出　　处：《光电子．激光》2008年第6期758-762,共5页Journal of Optoelectronics·Laser

基　　金：上海市科技委员会专项基金资助项目(011661081);东华大学校基金资助项目(109-10-0044125)

摘　　要：利用一个经过温度补偿封装的长周期光纤光栅解调系统中所有测量点的传感光栅的波长漂移,实现了实时、高效解调的准分布式测量。理论研究表明该系统适用于对温度、应变等参量的多布点准分布式测量。并以温度为例从实验上研究了高精度的准分布式光纤光栅传感系统。通过改善每个测量点的测量精度来提高整体系统的测量精度。利用金属槽对传感光纤布喇格光栅进行增温敏封装,使其温度灵敏系数比普通裸光栅提高了3.6倍,并利用经过温度增敏封装的光栅作为传感元件,在110℃(-50℃-60℃)的动态范围内实现了精度为0.04℃的多布点准分布式温度测量,理论分析与实验结果一致。A novel fiber Bragg grating（FBG） sensor system with low cost and effective demodulation technique is proposed. The sensor system is suited for strain and temperature quasi-distrlbuted measurement. A long period grating（LPG） is used as linear response filter to convert wavelength into intensity to interrogate the wavelength shifts of All the sensing FBGs, which achieves the real-time quasi-distributed measurement. A high precision quasi-distributed fiber grating temperature sensor system is mainly studied theoretically and experimentally. Metal groove encapsulating technique for fiber Bragg grating is developed to improve the temperature sensitivity of FBG temperature sensor. The temperature sensitivity of encapsulated FBG is improved and the sensitivity coefficient of it is 3.6 times as much as that of bare FBG. The encapsulated FBGs are used as sensor head in the quasi-distributed temperature sensor system,a repeat accuracy of 0.04 ℃is realized in the dy- namic range of 110 ℃ （-50 ℃-60 ℃）. The experimental results well agree with the theoretical analysis.

关 键 词：光纤光栅 传感 高精度 准分布 解调 

分 类 号：TN253[电子电信—物理电子学]