迟滞和蠕变补偿的F-P滤波器波长解调方法研究  

Study on F-P Filter-Based Wavelength Demodulation Method with Hysteresis and Creep Compensation

作　　者：路元刚[1] 王缘 彭楗钦 杨雁南[1] 赵宁[2] 王同光[2] Lu Yuangang;Wang Yuan;Peng Jianqin;Yang Yannan;Zhao Ning;Wang Tongguang(College of Science,Nanjing University of Aeronautics and Astronautics,N anjing,211106,China;Jiangsu Key Laboratory of Hi-Tech Research for Wind Turbine Design,Nanjing University of Aeronautics and Astronautics,Nanjing,210016,China)

机构地区：[1]南京航空航天大学理学院,南京211106 [2]南京航空航天大学江苏省风力机设计高技术研究重点实验室,南京210016

出　　处：《数据采集与处理》2018年第1期12-21,共10页Journal of Data Acquisition and Processing

基　　金：国家自然科学基金(61377086)资助项目;国家重点基础研究发展计划(九七三计划)(2014CB046200)资助项目;航空科学基金(2016ZD52042)资助项目;苏州市应用基础研究计划(SYG201546)资助项目;江苏省自然科学基金重点(BK20140059)资助项目;江苏省高校优势学科建设工程资助项目

摘　　要：在光纤布拉格光栅(Fiber Bragg grating,FBG)的波长解调方法中,可调谐法布里-珀罗(Fabry-Perot,F-P)滤波器解调法使用较多,但F-P滤波器中锆钛酸铅压电陶瓷(Pb(Zr1-xTix)O3,PZT)的迟滞和蠕变使F-P滤波器输出波长随时间非线性变化,带来波长解调误差大、传感检测精度低的问题。本文从研究F-P滤波器中的PZT迟滞和蠕变特性入手,提出了一种基于热标准具与PZT迟滞和蠕变补偿控制的F-P滤波器解调方法。控制PZT的驱动电压随时间非线性改变,使宽带光源经过F-P滤波器输出的波长能随时间等间隔变化,获得了随时间线性变化的标准具透射谱峰值波长,作为波长标尺的"刻度线",为解调传感光栅的波长提供精确的波长基准。利用FBG测温的实验结果表明,本文提出的方法与未进行迟滞和蠕变补偿控制的方法相比,温度测量精度提高约20倍,温度测量误差小于0.5℃。Tunable Fabry Perot(F-P)filter based demodulation methods are more used in the wavelength demodulation of fiber Bragg grating(FBG).However,the hysteresis and creep of the piezoelectric ceramic(Pb(Zr1-xTix)O3,PZT)in the F-P filter make the output wavelength of the F-P filter nonlinearly change with time,resulting in the problems of large wavelength demodulation error and low sensing accuracy.In this paper,we start with the study of hyste resis and creep characteristics of PZT in F-P filters,and propose an F-P filt er based wavelength demodulation method based on thermal etalon and hysteresis an d creep compensation control of the PZT.The driving voltage of PZT is controlled to change nonlinearly with time so that the wavelength of the broadband light source output through the F-P filter can be changed at equal intervals with time.The peak wavelength of the etalon transmission spectrum is thus obtained and also changes linearly with time.It acts as a"tick"for the wavelength scale and provides an accurate wavelength reference for demodulating the wavelength of the sensing grating.The experimental results of the FBG temperature measurement show that,compared with the method without hysteresis and creep compensation control,the proposed method improves the temperature measurement accuracy about 20 times and the temperature measurement error is less than 0.5℃.

关 键 词：光纤传感 F-P滤波器 波长解调方法 迟滞蠕变补偿 

分 类 号：TN253[电子电信—物理电子学]