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
鲁伟俊 1彭希锋 1陈爽 1邓文 1赖晖 1蒋荣峰1
作者信息
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Ur=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.
Abstract
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 cal-culated,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 Ur=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Key words
laser Doppler velocimetry/echo simulation/indication error detection/optical frequency shift引用本文复制引用
出版年
2024
NETL
NSTL
万方数据