共线外差干涉系统相位特性及应用研究  

Research on Phase Characteristics and Application of Collinear Heterodyne Interference System

作　　者：韩香伶 张志伟[1,2] 韩建宁[1] 程俊伟 史瑞忠 HAN Xiang-ling;ZHANG Zhi-wei;HAN Jian-ning;CHENG Jun-Wei;SHI Rui-zhong(College of Information and Communication Engineering,North University of China,Taiyuan 030051,China;State Key Laboratory of Electronic Testing Technology,North University of China,Taiyuan 030051,China)

机构地区：[1]中北大学信息与通信工程学院,山西太原030051 [2]中北大学电子测试技术国家重点实验室,山西太原030051

出　　处：《光学与光电技术》2023年第2期20-25,共6页Optics & Optoelectronic Technology

基　　金：山西省自然科学基金(201701D121060);山西省基础研究计划(202103021224201)资助项目。

摘　　要：针对信号调制与传输特点,设计搭建了一种由两个不同驱动频率声光调制器组成的外差干涉系统,双路光强调制避免了由声光调制引起的衍射级次混叠和频移漂移等影响,采用双路调制最后输出由两个+1级衍射光干涉形成的拍频信号,消除了级间干扰;同时系统良好的共线性和对称性,极大地减小了外界环境噪声对测量精度的影响,提高了检测精度。基于折射率改变引起的相位变化信息进行检测及处理,通过测量不同百分比浓度的溶液,并对系统的相位特性进行了研究,提出一种溶液浓度检测的新方案,并对激光漂移和调制强度对测量系统的影响进行了分析。实验结果表明,该检测系统能够较好地通过对信号相位差改变信息的处理完成对溶液浓度的检测,在0.1%~0.5%范围内,最大相对误差约为8.0%,为光外差干涉溶液浓度测量系统小型化设计和制造提供了参考。According to the characteristics of signal modulation and transmission,a heterodyne interference system composed of two acousto-optic modulators is designed and built.The two-way light intensity modulation avoids the effects of diffraction level mixing and frequency shift caused by acousto-optical modulation.The beat frequency signal formed by the interference of diffracted light from two+1 stages is finally output by using dual modulation.The inter-stage interference is eliminated.At the same time,the system has good collinearity and symmetry,which greatly reduces the influence of the external environment on the measurement and improves the detection precision.In this paper,the phase change information caused by the change of refractive index is detected and processed.The phase characteristics of the system are studied by measuring solutions with different percentage concentrations,and a new solution concentration detection scheme is proposed.The influence of laser drift and modulation intensity on the measurement system is analyzed as sell.The experimental results show that the detection system can effectively detect the concentration of the solution by processing the signal phase difference change information.In the range of 0.1%~0.5%,the maximum relative error is about 8.0%.It provides a reference for the design and fabrication of a miniaturized optical external difrential interference solution concentration measurment system.

关 键 词：相位调制 共线外差干涉 信号处理 溶液浓度 声光调制器 

分 类 号：TN247[电子电信—物理电子学]