外差波前检测仪检测精度影响分析  

Analysis of Influence on Detection Accuracy of Heterodyne Wavefront Detection Instrument

作　　者：戴玉 张文喜 孔新新 赵思泽鹏 徐豪 邓哲涛 Dai Yu;Zhang Wenxi;Kong Xinxin;Zhao Sizepeng;Xu Hao;Deng Zhetao(Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China;School of Optoelectronics,University of Chinese Academy of Sciences,Beijing 101400,China)

机构地区：[1]中国科学院空天信息创新研究院,北京100094 [2]中国科学院大学光电学院,北京101400

出　　处：《光学学报》2024年第14期154-161,共8页Acta Optica Sinica

基　　金：国家重点研发计划(2022YFF0706300)。

摘　　要：外差波前检测仪主要用于检测空间光与光纤耦合的环形器耦合效率以及装调过程,其具有检测精度高、环境适应性好等优点。基于其检测原理,分析声光移频器固定频率偏差、声光移频器随机频率偏差、探测器固定帧频偏差和探测器散粒噪声对检测精度的影响,单一因素引起的检测波前PV(Peak to valley)值变化在10-3λ量级。实验验证了仿真分析的有效性,系统的综合精密度优于0.01λ。研究结果为研制外差波前检测仪提供理论支撑。Objective Optical fibers have been widely used in various industries, national defense, and information technology due to their flexibility, low transmission loss, small size, and light weight. To avoid phase changes in optical fibers caused by environmental vibrations and temperature drift, a combination of fibers and free space optics is often used to construct a circulator device in typical applications, such as Doppler wind lidar and laser Doppler vibrometer systems. Alignment error is the main source of decreased coupling efficiency between fibers and free space optics. Many theoretical studies have examined the impact of mismatch factors on coupling efficiency, such as tilt and misalignment of fibers on coupling efficiency. However, few methods exist for detecting the relative spatial position information of optical fiber such as tilt and dislocation. Conventional detection methods, including the energy monitoring method and far-field coincidence monitoring method, cannot quantitatively analyze fiber mismatch factors. The coupling efficiency is related to the wavefront correlation coefficient between the two fibers, which is determined by their relative position. Monitoring the correlation between the two fiber wavefronts can guide assembly and quantitatively evaluate the coupling efficiency of this type of circulator. The phase detection technology based on Hertz-level frequency-shifting heterodyne interferometry can theoretically determine the wavefront correlation coefficient of the two fibers, which is related to the PV(Peak to valley)value of the interference wavefront.Methods Based on the theory of Hertz-level frequency-shifting heterodyne interferometry, the sources affecting the demodulated value of the interferometric phase are analyzed. The acousto-optic modulator(AOM) frequency is further segmented into fixed and random frequency for analysis. The parameters related to the detector including fixed frame frequency deviation and shot noise are analyzed.Results and Discussions A linear relationship

关 键 词：测量 外差干涉测量 光纤失配 频差偏差 帧频偏差 波前检测 

分 类 号：O436[机械工程—光学工程]