Study on Detection Method of Laser Doppler Velocimeter Indication Error Based on Echo Simulation Method
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.
laser Doppler velocimetryecho simulationindication error detectionoptical frequency shift
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