基于光纤激光环形腔的高频微弱振动信号检测系统  

High frequency weak vibration signal detection system based on optical fiber laser ring cavity

作　　者：刘文 孙丹 陈育培 章国安[1] 邹丽[1] 朱晓军[1] LIU Wen;SUN Dan;CHEN Yupei;ZHANG Guoan;ZOU Li;ZHU Xiaojun(School of Information Science and Technology,Nantong University,Nantong 226019,China)

机构地区：[1]南通大学信息科学技术学院,江苏南通226019

出　　处：《光学技术》2021年第6期641-646,共6页Optical Technique

基　　金：江苏省大学生创新创业训练计划项目(202010304055Z);江苏省先进光学制作技术重点实验室(KJS1858、KJS1204);江苏省“六大人才高峰”(KTHY-052);南通市基础科学研究项目(JC2020139、JC2021037)。

摘　　要：提出了一种基于光纤激光环形腔实现高频微弱振动信号检测的全光纤振动检测系统。将保偏光纤通过熔融拉锥技术拉锥形成具有多通道梳状滤波特性的微光纤马赫-曾德尔干涉仪(MMZI),通过和光纤激光环形腔系统结合,在200~20000Hz的范围内实现了对声源振动信号的动态响应,噪声极限最小检测压力为6.44mPa·Hz^(-1/2)。相对比于未接入光纤激光系统的声音频率响应范围为200~4000Hz,灵敏度为29.36mV·Pa^(-1),接入激光系统后声音频率响应范围扩大了近5倍,灵敏度提高了6倍,为宽频带声音检测系统以及微小光信号检测技术提供了一种行之有效的方法。An all-optical fiber vibration detection system based on optical fiber laser ring cavity to detect high frequency weak vibration signal is presented.A micro-fiber Mach-Zehnder interferometer with multi-channel comb filtering characteristics is formed by tapering polarization-maintaining fiber by fused taper technology.Combined with the fiber laser ring cavity system,MMZI achieves dynamic response to vibrating sound signals in the frequency range from 200 Hz to 20000 Hz.,and the minimum detection pressure of noise limit is 6.44 mPa·Hz^(-1/2).The sound frequency response range of the unconnected fiber laser system is 200 Hz to 4000 Hz and the sensitivity is 29.36 mV·Pa^(-1).After being connected to the laser system,the sound frequency response range is expanded by nearly 5 times and the sensitivity is increased by 6 times,which provides an effective method for broadband sound detection system and micro optical signal detection technology.

关 键 词：应用光学 光纤环形腔 微光纤马赫曾德尔干涉仪 保偏光纤 微小信号 振动检测 

分 类 号：TN29[电子电信—物理电子学]