激光多普勒测速仪示值误差检测方法研究  

Research on the Method of Laser Doppler Velocimeter Error Detection

作　　者：鲁伟俊 彭希锋 陈爽[1] 赖晖[1] 邓文 樊寅斌 Lu Weijun;Peng Xifeng;Chen Shuang;Lai Hui;Deng Wen;Fan Yinbin(Metrology and Testing Center,China Academy of Engineering Physics,Mianyang Sichuan 621000)

机构地区：[1]中国工程物理研究院计量测试中心,四川绵阳621000

出　　处：《中国仪器仪表》2023年第11期35-37,共3页China Instrumentation

摘　　要：针对激光多普勒测速仪示值误差的检测,传统的检测方式是通过获得相应运动速度的运动物体,以其为标准完成测速仪示值误差的检测。但针对高速激光多普勒测速仪(公里级每秒)示值误差的检测,现有速度获取方式无法获取相应的速度上限。为此,本文提出采用光学回波模拟法对其进行示值误差检测。通过光学移频技术模拟测速仪测速过程中产生的多普勒频移,构造携带目标信息的光回波,从而实现对应速度激光多普勒测速仪示值误差的检测。本文以声光移频器与各类空间光器件搭建了检测系统,对某型号的激光多普勒测速仪进行了单点测速示值误差的检测试验。由实验结果可知,针对测速仪示值误差检测的光学回波模拟法是可行性,具有一定的工程应用前景。For the tseting of laser Doppler velocimeter error detection,the traditional detection method is to obtain the corresponding movement speed of the moving object,to use it as a standard to complete the detection of tachometer indication value error.However,for the detection of high speed laser Doppler velocimetry(kilometers per second),the existing speed acquisition methods cannot obtain the corresponding upper speed limit.To this end,this paper proposes the use of optical echo simulation method for the detection of its oscillometric error.The optical frequency shift technique is used to simulate the Doppler shift in the speed measurement process of the tachometer and construct the optical echo carrying the target information,so as to realize the detection of the value error of the laser Doppler tachometer with the corresponding speed.In this paper,the detection system is built with acoustooptical frequency shifter and various types of spatial optical devices,and the detection test of singlepoint velocimetric indication error is carried out for a model of laser Doppler velocimeter.From the experimental results,it can be seen that the optical echo simulation method for tachometer oscillometric error detection is feasible and has certain prospects for engineering applications.

关 键 词：光学回波模拟 示值误差检测 激光多普勒测速仪 声光移频器 

分 类 号：TH744.5[机械工程—光学工程]