基于FPGA控制与白光干涉技术的多通道光纤EFPI绝对腔长测量系统  

Multi-channel Optical Fiber EFPI Absolute Cavity Length Measurement System Based on FPGA Control and White-light Interference Technology

作　　者：常庄 江毅(指导)[1] CHANG Zhuang;JIANG Yi(School of Optics and Photonics,Beijing Institute of Technology,Beijing 100081,China;Key Laboratory of Photonic Information Technology,Ministry of Industry and Information Technology,Beijing 100081,China)

机构地区：[1]北京理工大学光电学院,北京100081 [2]信息光子技术工业和信息化部重点实验室,北京100081

出　　处：《光子学报》2022年第11期88-95,共8页Acta Photonica Sinica

基　　金：国家自然科学基金(No.U20B2057)。

摘　　要：介绍了一种基于光纤白光干涉测量技术和现场可编程门阵列的多通道高速外腔式法珀干涉型传感器解调系统。该系统由一个半导体光放大器和一个光纤法珀可调谐滤波器来制作一个高速波长扫描光纤激光器,通过对称三角波技术驱动可调谐法珀滤波器产生扫描频率为1 kHz的扫频光谱。用FPGA实现EFPI传感器的高速信号解调。该系统实现了4通道每个通道2 kHz的EFPI传感器高速解调。With the rapid development of aerospace industry,optical fiber sensing technology has been widely used.The optical fiber sensor does not contain electronic components,so it has strong antielectromagnetic interference ability and good electrical insulation,it can be used in many kinds of environment.It uses light wave transmission in an optical fiber to obtain the outside signal and measure the relative physical quantity.Fiber optics can both transmit light and sense signals.When the optical fiber sensor detects the measured physical quantity,the parameters such as wavelength,intensity,phase and frequency of the transmitted light wave will change.The optical fiber sensor can measure hundreds of physical quantities,including temperature,pressure,strain,displacement,acceleration and so on.The use of optical fiber sensors has become more and more popular in recent years,in the military defense,aerospace,industrial control,measurement and testing,exploration and other fields have a broad market.At present,Fiber Bragg Grating(FBG)sensors and Fiber Fabry-Perot(F-P)sensors are mainly used in practical applications.The optical fiber EFPI sensor has many advantages,such as small volume,high precision and large dynamic range.At present,there are two demodulation methods for the measurement of optical fiber EFPI sensor,one is fiber laser interferometry,the other is fiber white light interferometry.The former is suitable for the relative measurement of dynamic signals,while the latter is generally used for the absolute measurement of static or slowly varying signals.White light interferometry can realize absolute measurement,which has the advantages of a large dynamic range and strong anti-interference ability.Currently,various types of white light interferometry demodulation methods have been applied,including peak method,wavelength tracking method,interference order method,principal frequency method and Fourier transform method.Because of its various advantages,this technology can be widely used in practical engineering.Wit

关 键 词：外腔式法珀干涉仪 光纤传感器 高速白光干涉测量 现场可编程门阵列 信号高速解调 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]