摘要
弹光调制器是由各向同性的弹光晶体和压电晶体组成的谐振器件,其谐振频率随温度变化会发生漂移,导致弹光调制器工作不稳定,调制效率降低。针对此问题,在弹光调制器工作原理和谐振模型的基础上,提出了一种基于数字合成技术和数字锁相技术的占空比自动调节驱动控制方法。该方法通过检测驱动电压与反馈电流的相位关系,自动调节驱动信号的占空比,即对驱动电压进行微调。实验结果表明,该方法可在弹光调制器谐振频率漂移时对驱动电压进行实时调节,以满足项目所需的光程差,且将弹光调制器的稳定性提高了5.4%。证明该方法可有效地提升弹光调制器的稳定性和调制效率。
The photo-elastic modulator is a resonant device composed of isotropic photo-elastic crystal and piezoelectric crystal,and its resonance frequency will drift with temperature changes,which will cause the photo-elastic modulator to work unstable and reduce the modulation efficiency.In response to this problem,based on the study of the working principle and resonance model of the photo-elastic modulator,this paper proposes a drive control method based on digital synthesis technology and digital phase-locking technology for duty cycle automatic adjustment.This method automatically adjusts the duty cycle of the driving signal by detecting the phase relationship between the driving voltage and the feedback current,that is,fine-tuning the driving voltage.The experimental results show that this method can adjust the driving voltage in real time when the resonance frequency of the photo-elastic modulator drifts to meet the optical path difference required by the project,and improve the stability of the bounce optical modulator by 5.4%.It is proved that this method can effectively improve the stability and modulation efficiency of the photo-elastic modulator.
作者
刘文敬
张敏娟
李晋华
李克武
李春阳
Liu Wenjing;Zhang Minjuan;Li Jinhua;Li Kewu;Li Chunyang(School of Information and Communication Engineering,North University of China,Taiyuan 030051,China;Engineering and Technology Research Center of Shanxi Provincial for Optical-Electric Information and Instrument,North University of China,Taiyuan 030051,China)
出处
《国外电子测量技术》
2020年第8期17-21,共5页
Foreign Electronic Measurement Technology
基金
国家自然科学基金青年基金(61505180)
山西省自然自然科学基金(201901D111163,201901D211234,201901D111145)项目资助。
关键词
弹光调制器
频率温漂
数字合成技术
数字锁相技术
占空比调节
photo-elastic modulator
frequency drifting along with temperature
digital synthesis technology
digital phase lock technology
duty cycle adjustment
