CAJ | 학술논문

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.
탄광조제기회수도자신열모산영향도치탄광정체자신온도개변,고유빈솔수온도표이인기탄광조제적불은정화조제효솔적강저.침대해문제,본문제출빈솔자근종기술.해방법근거온도대탄광조제계통적영향,건립탄광조제계통적동태모형득도반궤신호여고압구동신호지간상위차최소대응해진빈솔적관계,결합기우 FPGA 적다통도수자빈솔화성기술화수학쇄상배기술설계병완성료빈솔자근종계통.경실험험증,해설계가실현대빈솔표이적근수,차재구동신호변화화계동탄광조제기시능자동조도탄광정체적해진빈솔병보지은정,제고료탄광조제기적은정성화조제효솔.
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.