基于激光自混合干涉技术实现微小振动测量的研究  

Research on micro vibration measurement based on laser self-mixing interferometry

作　　者：梁焜 王雨宁 周健[1] LIANG Kun;WANG Yuning;ZHOU Jian(College of Meteorology and Oceanography,National University of Defense Technology,Changsha 41oo73,China;Frontier Interdisciplinary College,National University of Defense Technology,Changsha 410073,China)

机构地区：[1]国防科技大学气象海洋学院,湖南长沙410073 [2]国防科技大学前沿交叉学科学院,湖南长沙410073

出　　处：《光学技术》2024年第5期613-618,共6页Optical Technique

基　　金：国家级大学生创新创业训练计划(S202390002001)。

摘　　要：提出搭建新型激光自混合干涉系统,利用激光自混合干涉效应,选用窄线宽低噪声线偏振固体激光器作为光源,增加EOM电光调制晶体,引入电光正交调制解调算法。实验和理论分析表明,激光自混合干涉能够实现弱反馈下的振动测量,且新搭建的自混合系统结构简单,操作方便,易实现小型化;电光正交调制解调算法解决了反解卷的跃变点迁移问题,提高了信号处理速度和测量的实时性。因此电光调制解调的激光自混合干涉仪,能够克服靶镜对于干涉仪应用场景的限制,实现非合作表面微小振动的纳米级高精度的实时测量。It is proposed to build a new type of laser self-hybrid interference system, use the laser self-mixed interference effect, and select the narrow line width and low noise line polarizing solid laser as a light source, increase the EOM electro-light modulation crystal, and introduce electro-optic orthogonal modulation and demodulation algorithms. Experimental and theoretical analysis shows that laser self-hybrid interference can achieve vibration measurement under weak feedback, and the newly constructed self-hybrid system structure is simple, convenient to operate, and easy to achieve miniaturization. The problem of migration of the jump point improves the speed of signal processing and the real time of measurement. Therefore, the laser self-hybrid interference instrument of the electro-lighting and demodulation can overcome the limitations of the target mirror on the application scenarios of the interference instrument, and realize the real-time measurement of the nano-level high-precision of the non-co-operating surface.

关 键 词：自混合 激光 非合作表面 电光调制 

分 类 号：TN249[电子电信—物理电子学]