基于回波模拟法的激光多普勒测速仪示值误差检测方法研究  

Study on Detection Method of Laser Doppler Velocimeter Indication Error Based on Echo Simulation Method

作　　者：鲁伟俊 彭希锋 陈爽[1] 邓文 赖晖[1] 蒋荣峰 LU Weijun;PENG Xifeng;CHEN Shuang;DENG Wen;LAI Hui;JIANG Rongfeng(Metrology and Testing Center,China Academy of Engineering Physics)

机构地区：[1]中国工程物理研究院计量测试中心

出　　处：《仪表技术与传感器》2024年第7期30-34,共5页Instrument Technique and Sensor

摘　　要：针对高速激光多普勒测速仪(速度上限超过1 km/s)示值误差检测中参考速度难以获得导致测速仪示值误差无法有效检测的问题,提出采用光学回波模拟法对其进行示值误差检测。通过对测速仪的出射光进行光学移频,以此模拟运动物体的激光多普勒效应,从而解决高速多普勒测速仪检测所需速度源的问题;通过设置波长检测模块与移频量检测模块,获得准确的工作波长与移频频率,进而计算出准确的参考速度信息,保证激光多普勒测速仪示值误差检测的准确性。实验结果表明:基于回波模拟法的激光多普勒测速仪示值误差检测方法,可以实现速度上限高达2.7 km/s的测速仪示值误差的检测,示值误差测量不确定度U_(r)=0.3%(k=2)。实验结果表明基于回波模拟法的激光多普勒测速仪示值误差检测技术具有很好的工程应用前景。In order to solve the problem that the reference speed is difficult to obtain in the detection of the display error of the high-speed laser Doppler velocimeter(the upper speed limit is more than 1 km/s),it was proposed to adopt the optical echo simulation method for the detection of the display error of the high-speed laser Doppler velocimeter.By optically shifting the emitted light of the velocimeter to simulate the laser Doppler effect of the moving object,the problem of the required speed source of the high-speed Doppler velocimeter can be solved.By setting up a wavelength detection module and a frequency shift detection module,the accurate working wavelength and frequency shift can be obtained,and then the accurate reference speed can be calculated,which ensured the accuracy of the detection of the display error of the laser Doppler velocimeter.The experimental results show that the detection method of laser Doppler velocimeter indication error based on the echo simulation method can achieve the detection of indication error of velocimeter with the upper speed limit as high as 2.7 km/s,and the uncertainty of indication error measurement is U_(r)=0.3%(k=2).The experimental results show that the laser Doppler velocimeter detection technique based on the echo simulation method has a good prospect of technical application.

关 键 词：激光多普勒测速仪 回波模拟 示值误差检测 光学移频 

分 类 号：TH89[机械工程—仪器科学与技术]