量子电子学报2025，Vol.42Issue(3)：345-353,9.DOI:10.3969/j.issn.1007-5461.2025.03.006
基于载波频谱分析的激光多普勒振动信号解调
Demodulation of laser Doppler vibration signal based on carrier spectrum analysis
摘要
Abstract
Laser Doppler vibration measurement mostly uses laser heterodyne method,which requires orthogonal mixing,filtering,and arc tangent operations in the demodulation process,and the demodulation process is very complex process with high hardware requirements.In this work,we propose a spectrum analysis method based on laser Doppler carrier signal,which uses the intensity relationship between the carrier main frequency and the side frequency caused by vibration signal to directly resolve the amplitude and frequency information of vibration target,and its maximum detectable amount is not limited by the conventional heterodyne demodulation limit.The feasibility of the method is further verified by simulation and experimental study.In the benchmarking experiment with the standard vibration sources,when the distance from the vibration target is 17 m,and the vibration target frequency range is 60 Hz-20 kHz,the measured amplitude range of the scattered light signal is 21.44 pm-44.21 μm,showing excellent demodulation consistency with the reference value.It is indicated that the spectrum analysis method proposed in this work can be applied to non-contact long-distance measurement of smooth vibration signals.关键词
激光技术/激光测振/频谱分析/多普勒信号/相干探测Key words
laser techniques/laser vibration measurement/spectral analysis/Doppler signal/coherent detection分类
电子信息工程引用本文复制引用
朱军,张明蔚,施鹏磊,侯聪,李翔,俞本立..基于载波频谱分析的激光多普勒振动信号解调[J].量子电子学报,2025,42(3):345-353,9.基金项目
安徽省高校协同创新计划(GXXT-2020-050) （GXXT-2020-050）
