光纤干涉传感器相位生成载波解调算法研究  

Research on improvement of phase generated carrier demodulation algorithm for fiber optic interferometric sensor

作　　者：胡雨润 王目光[1] 孙春然 张静[1] 邴帆 陈德胜[3] HU Yurun;WANG Muguang;SUN Chunran;ZHANG Jing;BING Fan;CHEN Desheng(Key Laboratory of All-Optical Network and Modern Communication Network of Ministry of Education, Institute of Lightwave Technology, Beijing Jiaotong University, Beijing 100044, China;China North Industries Co. Ltd., Beijing 100053, China;State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China)

机构地区：[1]北京交通大学光波技术研究所全光网络与现代通信网教育部重点实验室,北京100044 [2]中国北方工业有限公司,北京100053 [3]中国科学院声学研究所声场声信息国家重点实验室,北京100190

出　　处：《激光技术》2022年第2期213-219,共7页Laser Technology

基　　金：国家自然科学基金资助项目(U2006217,61775015)。

摘　　要：为了解决传统的相位生成载波解调算法中由调制深度漂移引起的解调结果失真现象,采用微分交叉相除的信号解调方法进行了相关的理论分析及仿真验证,得到了一种不受调制深度限制的高性能相位生成载波解调方案。结果表明,在采用不同幅值和频率的待测信号进行仿真时,改进算法的解调性能始终十分优异;且当调制深度的值为典型值2.63rad和2.37rad以及非典型值1.5rad和3.0rad时,使用该算法得到的解调信号都没有发生失真;同时,当调制深度在0.5rad~3.5rad范围内变化时,与传统解调算法相比,改进算法中解调信号的幅值始终与待测信号保持一致,且高次谐波分量始终非常小。该研究解决了传统解调算法中调制深度变化带来的失真现象,为光纤干涉型传感系统的解调方案提供了参考。In order to solve the distortion of the demodulated signal caused by the drift of modulation depth in the traditional phase generation carrier demodulation algorithms,the signal demodulation method of differential cross division was adopted.Related theoretical analysis and simulation verification were carried out,and a high-performance phase-generating carrier demodulation scheme that was not limited by the modulation depth was obtained.The results show that the demodulation performance of the improved algorithm is always excellent when the signals under test of different amplitudes and frequencies are used for simulation.When the values of modulation depth are respectively typical values such as 2.63rad and 2.37rad and atypical values such as 1.5rad and 3.0rad,the demodulated signals obtained by improved algorithm has no distortion.At the same time,when the modulation depth changes in the range of 0.5rad~3.5rad,compared with traditional demodulation algorithms,the amplitude of the demodulated signal in the improved algorithm is always consistent with the signal under test and the high-order harmonic components are always very small.This research solves the distortion phenomenon caused by the modulation depth change in traditional demodulation algorithms,and provides a reference for the demodulation scheme of the optical fiber interferometric sensor system.

关 键 词：传感器技术 信号解调 微分交叉相除 调制深度 

分 类 号：TP212.44[自动化与计算机技术—检测技术与自动化装置]