两路微振动信号的光纤F-P腔干涉测量  

Optical fiber F-P cavity interferometry of two micro vibration signals

作　　者：赵忖[1] 刘径舟 ZHAO Cun;LIU Jing-zhou(Northeast Petroleum University Qinhuangdao,Qinhuangdao 066004,China;Daqing Oil Field Limited Corporation,Daqing 163000,China)

机构地区：[1]东北石油大学秦皇岛校区,河北秦皇岛066004 [2]大庆油田有限责任公司,黑龙江大庆163000

出　　处：《激光与红外》2021年第3期353-357,共5页Laser & Infrared

基　　金：黑龙江省省属本科高校引导性创新基金项目(No.2019QNQ-01)资助。

摘　　要：法布里-珀罗(F-P)腔传感器结构简单,复用能力强,对导致其腔长发生变化的物理量灵敏度高,在超精密测量领域日益受到重视。为了使用一套光纤F-P腔测量两个目标,设计了两路反馈信号光纤F-P腔干涉系统,同时开展两路微振动信号测量。对两路微振动反馈F-P腔干涉信号,经多次取包络分解,得到了高、低频信号频谱,进而计算出待测目标振幅。实验结果表明,通过低频信号恢复待测目标振幅的误差为1.32%,通过高频信号恢复待测目标振幅的误差为6.63%。该方法有效实现了两路反馈光纤F-P腔干涉信号的分离,拓展了测量通道,提高了抗干扰能力。Fabry-Perot cavity(F-P)sensor has simple structure and strong multiplexing ability.It has high sensitivity to the physical quantities that lead to the changing of cavity length;it has been paid more and more attention in the field of ultra precision measurement.In order to measure two targets with a set of fiber F-P cavity,an F-P cavity interference system with mixed two feedback signals in the cavity is designed.At the same time,conducted on micro vibration measurement of two channel sand obtained the mixed interference signals of two feedbacks F-P.It has the high and low frequency signal spectrum by many times of envelope decomposition and then calculated amplitude of the target to be measured.The results show that the amplitude error of the target to be measured is 6.63%by high frequency signal and 1.32%by low frequency signal.The amplitude measurement of two micro vibration signals is realized effectively,the measurement channel of F-P cavity is expanded,and the anti-interference ability is improved.The results show that the amplitude error of the target to be measured is 1.32%by low frequency signal and 6.63%by high frequency signal.It could effectively realize the measurement of two micro vibration signals,expanded the measurement channel of F-P cavity and improved the anti-interference ability.

关 键 词：光纤F-P腔干涉 微振动 两路反馈 取包络 

分 类 号：TN247[电子电信—物理电子学]