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弹光调制的频率自跟踪技术

Self Tracking Technology of Photoelastic Modulation Frequency

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摘要

弹光调制器会受到自身热耗散影响导致弹光晶体自身温度改变,固有频率随温度漂移引起弹光调制的不稳定和调制效率的降低。针对该问题,本文提出频率自跟踪技术。该方法根据温度对弹光调制系统的影响,建立弹光调制系统的动态模型得到反馈信号与高压驱动信号之间相位差最小对应谐振频率的关系,结合基于FPGA 的多通道数字频率和成技术和数学锁相环技术设计并完成了频率自跟踪系统。经实验验证,该设计可实现对频率漂移的跟随,且在驱动信号变化和启动弹光调制器时能自动找到弹光晶体的谐振频率并保持稳定,提高了弹光调制器的稳定性和调制效率。

Abstract

The photoelastic modulator can be affected by its heat dissipation, which induces the change of elasto optical crystal its temperature, natural frequency drift with the temperature caused photoelastic modulation instability and modulation efficiency is decreased. The frequency self tracking technology is presented. According to the effect of temperature on photoelastic modulation system, dynamic model of photoelastic modulation system is established to get the relation between the feedback signal and the high voltage drive signal that the minimum phase difference corresponding resonant frequency. Combined with multichannel Direct Digital Synthesis and Digital Phase Locked Loop technology based on FPGA design, the self frequency tracking system is completed. By experimental verification, the design can achieve the following on the frequency drift, and be able to automatically find elastic optical crystal resonance frequency and remain stable when the drive signal change or start the photoelastic modulator, which improves the stability and modulation efficiency of elastic light modulator.

Newport宣传-MKS新实验室计划
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中图分类号:TN29

DOI:10.3969/j.issn.1003-501x.2015.10.004

所属栏目:目标识别与跟踪

基金项目:国际科技合作项目(2012DFA10680; 2013DFR10150);国家自然科学基金仪器专项基金项目(61127015);山西省青年基金项目(2015021084)

收稿日期:2015-01-09

修改稿日期:2015-04-01

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陈光威: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
安永泉:中北大学山西省光电信息与仪器工程技术研究中心仪器科学与动态测试教育部重点实验室,太原 030051
王志斌:中北大学山西省光电信息与仪器工程技术研究中心仪器科学与动态测试教育部重点实验室,太原 030051
陈友华:中北大学山西省光电信息与仪器工程技术研究中心仪器科学与动态测试教育部重点实验室,太原 030051
张敏娟:中北大学山西省光电信息与仪器工程技术研究中心仪器科学与动态测试教育部重点实验室,太原 030051
王国梁: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
杨 晓: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

联系人作者:陈光威(827162145@qq.com)

备注:陈光威(1990-),男(汉族),山东菏泽人。硕士研究生,主要研究光电信息系统的设计与实现。

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引用该论文

CHEN Guangwei,AN Yongquan,WANG Zhibin,CHEN Youhua,ZHANG Minjuan,WANG Guoliang,YANG Xiao. Self Tracking Technology of Photoelastic Modulation Frequency[J]. Opto-Electronic Engineering, 2015, 42(10): 21-26

陈光威,安永泉,王志斌,陈友华,张敏娟,王国梁,杨 晓. 弹光调制的频率自跟踪技术[J]. 光电工程, 2015, 42(10): 21-26

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