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设计和讨论了一种利用Fizeau干涉仪进行激光风速测量的原理。该系统采用Fizeau干涉仪进行信号频谱分析 ,形成的梳状干涉图案强度分布可以通过线列CCD探测器测定 ,其重心位置决定信号的多普勒频移量或径向风速。利用Monte Carlo方法模拟计算了该系统的测量精度 ,结果表明 ,在 90 %的光子数探测几率下 ,多普勒测量精度约是单个CCD探测通道谱宽的 10 % ;激光雷达系统风速测量的精度在垂直高度 2km内优于 2m/s。
A principle of laser velocity measurement using Fizeau interferometer was designed and discussed. The system uses Fizeau interferometer for signal spectrum analysis, and the intensity distribution of the formed comb interference pattern can be determined by a line CCD detector. The center of gravity determines the Doppler shift amount or radial wind speed of the signal. The Monte Carlo method is used to simulate the measurement accuracy of the system. The results show that the Doppler measurement accuracy is about 10% of the spectral width of a single CCD detection channel at 90% photon detection probability. The accuracy of laser radar system’s wind speed measurement In the vertical height of 2km better than 2m / s.