弹光调制器相频特性分析与稳定控制技术  

Analysis of phase frequency characteristics and stability control technology of photoelastic modulator

作　　者：刘坤 李克武[2,3] 李坤钰 王爽 王志斌 LIU Kun;LI Kewu;LI Kunyu;WANG Shuang;WANG Zhibin(School of Instruments and Electronics,North University of China,Taiyuan 030051,China;Engineering and Technology Research Center of Shanxi Province for Opto-electronic Information and Instrument,North University of China,Taiyuan 030051,China;Academy for Advanced Interdisciplinary Research,North University of China,Taiyuan 030051,China)

机构地区：[1]中北大学仪器与电子学院,太原030051 [2]中北大学山西省光电信息与仪器工程技术研究中心,太原030051 [3]中北大学前沿交叉科学研究院,太原030051

出　　处：《激光杂志》2024年第7期36-41,共6页Laser Journal

基　　金：国家自然科学基金(No.62205310、62205309)。

摘　　要：针对弹光调制器(Photoelastic Modulator,PEM)在高压驱动下的谐振频率漂移问题,研究了一种基于PEM谐振相位跟踪的稳定控制技术。建立了PEM与其谐振匹配回路的等效电路模型,推导了PEM驱动电压的幅频、相频关系,以及PEM谐振频率与驱动电压谐振相位的关系。搭建了PEM控制系统,以初始谐振频率的反馈电压相位为零相位基准,调节驱动电压将反馈电压相位稳定在相位基准值附近,并随谐振频率的变化修正相位基准值,从而使驱动电压频率始终稳定于PEM谐振频率附近。以1/4波、半波的PEM的相位延迟幅值为例,分别进行了时长60 min稳定控制测试,实验结果表明:(1)PEM工作在1/4波状态时,相位延迟幅值δ0标准偏差σδq=0.0014 rad,最大相对偏差为0.58%;(2)PEM工作在半波状态时,标准偏差σδh=0.0013 rad,最大相对偏差为0.32%。A stable control technique based on Photoelastic Modulation(PEM)for resonant phase tracking of driving signal is studied.The equivalent circuit model of PEM and its resonance matching circuit is established,and the amplitude-frequency and phase-frequency relationships of driving voltage and inductance voltage of the matching circuit are deduced,as well as the relationship between PEM resonance frequency and inductance voltage resonance phase.A PEM control system is set up,with the feedback voltage phase of the initial resonance frequency as the zero phase reference.Adjusting the drive voltage stabilizes the feedback voltage phase near the phase reference value,and corrects the phase reference value with the change of the resonance frequency so that the drive voltage frequency is always stable near the PEM resonance frequency.Taking the phase delay amplitude of 1/4 wave and half wave PEM as examples,the stability control tests for 60 min are performed.The results show that:(1)When PEM works in 1/4 wave state,σδq=0.0014 rad,the maximum relative deviation is 0.58%;(2)Standard deviation when working in half-wave state,σδh=0.0013 rad with a maximum relative deviation of 0.32%.

关 键 词：相频特性 弹光调制器 相位调制 频率跟踪 稳定控制 

分 类 号：TN997[电子电信—信号与信息处理]