声光器件的动态特性及其对激光测速的影响

Dynamic Response of Acousto-optic Device and Its Influence on LDA

在光电混合反馈激光测速系统(OEHF-LDA)和声光扫描激光测速系统(AOS-LDA)中,起光学频移作用的声光调制器和控制测量位置的声光偏转器均处于变频工作模式,因此声光器件的动态特性对系统的性能具有重要的影响。该文从理论分析、数值计算和实验研究入手,具体讨论了声光器件的动态响应特性,它可用具有纯滞后的一阶非周期环节来表征,并深入分析了声光器件的滞后特性对变频光学频移LDA系统的影响,最后提出了对变频声光器件调节的基本要求。

This paper deals with important influence of acousto-optic device's dynamic response on OEHF-LDA and AOS-LDA, in which acoustooptic modulator and deflector working with variable frequency. Begin with theoretical analysis, dynamic response of acousto-optic device is discussed through computation and the theoretic results are proved by experiment. Then the influence of delay response on OEHF-LDA and AOS-LDA is discussed deeply, and finally.essential requirement on adjustment of acousto-optic device is given.