基于F-P标准具非线性波长校准的FBG传感系统解调方法  

Demodulation method of FBG sensing system based on F-P standard with nonlinear wavelength calibration

作　　者：陆行知 董明利[1,2] 张旭 何彦霖[1,2] Lu Xingzhi;Dong Mingli;Zhang Xu;He Yanlin(Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instrument,Beijing Information Science and Technology University,Beijing 100192,China;Laboratory of Optical Fiber Sensing&Systems,Beijing Information Science and Technology University,Beijing 100016,China;Tianjin University,Tianjin 300072,China)

机构地区：[1]北京信息科技大学光电测试技术及仪器教育部重点实验室,北京100192 [2]北京信息科技大学光纤传感与系统北京实验室,北京100016 [3]天津大学,天津300072

出　　处：《电子测量与仪器学报》2023年第7期26-32,共7页Journal of Electronic Measurement and Instrumentation

基　　金：国家自然科学青年基金(61903041)项目资助。

摘　　要：针对光纤布拉格光栅(fiber Bragg grating,FBG)解调系统在变温环境下由于波长漂移引起的解调精度不足问题,提出了一种基于法布里-珀罗(Fabry-Perot,F-P)标准具非线性波长漂移校准的FBG传感系统解调方法。研究建立了引入F-P标准具的FBG解调系统,设计了基于F-P标准具非线性误差补偿的波长校准流程,搭建了FBG解调系统在航空航天实际应用环境中的模拟实验系统,并在恒温及变温环境下进行了实验测试。实验结果表明,本文所提出方法在恒温及变温环境下的传感系统解调稳定性在±0.6 pm及±1.1 pm以内,且在变温环境下传感系统解调的波长漂移量从20.3 pm减小到0.7 pm。验证了解调方法的精度和稳定性,为航空航天等领域的结构健康监测提供了参考。Aiming at the problem of deficient demodulation precision in fiber Bragg grating(FBG)demodulation system caused by wavelength drift in a variable temperature environment,a grating method for FBG sensing system based on Fabry-Perot(F-P)standard for nonlinear wavelength drift calibration was proposed.In this paper,the FBG demodulation system based on the F-P standard is established,the wavelength calibration process based on the nonlinear error compensation of the F-P standard is designed,and the simulation experiment system of the FBG demodulation system in the practical application environment of aerospace is built,and the experimental tests are carried out in the constant temperature and variable temperature environment.The experimental results show that the demodulation stability of the sensor system is within±0.6 pm and±1.1 pm under constant temperature and variable temperature,and the wavelength drift of the sensor system demodulation decreases from 20.3 pm to 0.7 pm under variable temperature.The accuracy and stability of the method are verified,which provides a reference for structural health monitoring in aerospace and other fields.

关 键 词：FBG解调 F-P标准具 非线性误差补偿 波长校准 

分 类 号：TN253[电子电信—物理电子学]