基于MG-Y激光器的光纤法珀传感器信号处理系统  

Signal Processing System of Fiber Fabry-Perot Sensor Based on MG-Y Laser

作　　者：高凯波 李佳明 颜正强 朱旭峰 袁世辉 刘盾盾 薛原 贾平岗[1] GAO Kai-bo;LI Jia-ming;YAN Zheng-qiang;ZHU Xu-feng;YUAN Shi-hui;LIU Dun-dun;XUE Yuan;JIA Ping-gang(North University of China,State Key Laboratory of Dynamic Measurement Technology,Taiyuan 030051,China;Key Laboratory on Aero-Engine Altitude Simulation Technology,Sichuan Gas Turbine Establishment,AECC,Mianyang 621000,China)

机构地区：[1]中北大学,省部共建动态测试技术国家重点实验室,山西太原030051 [2]中国航发四川燃气涡轮研究院高空模拟技术重点实验室,四川绵阳621000

出　　处：《仪表技术与传感器》2023年第4期62-65,71,共5页Instrument Technique and Sensor

基　　金：国家自然科学基金项目(52075505);国家科技重大专项项目(J2019-V-0015-0110)。

摘　　要：针对目前光纤法珀传感器腔长解调系统复杂的问题,提出了一种以MG-Y可调谐激光器为扫描光源的光纤法珀传感器信号处理系统。该系统利用FPGA主控芯片驱动MG-Y激光器实现C波段的线性扫描,同时将光谱信号以触发采样的方式转化为电学信号传送到上位机,设计LabVIEW上位机实现傅里叶频率测量法与最小二乘拟合法运算,最终完成传感器腔长的解调。在实验中使用该系统对不同腔长的光纤法珀传感器进行解调运算,并将解调结果与光谱分析仪解调结果进行对比,实验表明二者具有较好的一致性,在不损失精度的情况下实现了解调系统的小型化。In order to solve the problem that the cavity length demodulation system of fiber Fabry-Perot sensor is complex,a fiber Fabry-Perot sensor signal processing system using MG-Y tunable laser as scanning light source was proposed.The system used the FPGA master chip to drive the MG-Y laser to realize the linear scanning of C-band,and at the same time,the spectral signal was converted into electrical signal by triggered sampling and transmitted to the host computer,and the LabVIEW host computer was designed to realize the Fourier frequency measurement and least-squares fitting algorithm to finally complete the demodulation of the sensor cavity length.In the experiment,the system was used to demodulate different cavity lengths of Fabry-Perot sensors,and the demodulation results were compared with those of the spectrum analyzer,which shows that the two are in good agreement and the demodulation system is miniaturized without loss of accuracy.

关 键 词：法珀传感器 可调谐激光器 触发采样 傅里叶频率测量法 最小二乘拟合方法 

分 类 号：TN36[电子电信—物理电子学]