以马赫-曾德尔干涉仪作为谱分析器,进行了多普勒频移和气溶胶的非相干探测模拟实验。在发射机脉冲能量为500 mJ,重复频率为10 Hz,光谱线宽不超过0.005 cm -1,光束发散角小于0.10 mrad,接收望远镜镜头直径为350 mm,以雪崩二极管为探测器,数字采样率为2×10 7 sampling/s,采样数据位数为16 bit(有效位数为11 bit)的条件下,获得了45°斜程探测距离为2500 m的风廓线,视线风速探测精度为2 m·s -1。模拟结果显示,以马赫-曾德尔干涉仪作为谱分析器的激光雷达可用于火星风沙直接探测。相对于354.7 nm激光脉冲,1064 nm激光脉冲(可以与激光诱导击穿光谱仪兼容)回波的干涉对比度高,Mie后向散射强度高于Rayleigh后向散射强度。

The simulation experiments of non-coherent detection of Doppler frequency shift and aerosol are carried out with the Mach-Zehnder interferometer as the spectral analyzer. Under the condition that the pulse energy of the transmitter reaches 500 mJ, the pulse repetition rate is 10 Hz, the spectral line width does not exceed 0.005 cm ^-1, the beam divergence angle is less than 0.10 mrad, the lens diameter of receiving telescope is 350 mm, the avalanche diode is used as the detector, the digital sampling rate is 2×10 ⁷ sampling·s ^-1, and the number of sampling data bits is 16 bit (the effective number is 11 bit), the wind profile with the detection distance of 2500 m in 45° oblique range is obtained and the detection accuracy of line-of-sight wind speed is 2 m·s ^-1. The simulation results show that the radar with the Mach-Zehnder interferometer as the spectral analyzer can be used for the direct detection of Martian wind-sand. Compared with the 354.7 nm laser pulse, the 1064 nm laser pulse (compatible with the laser-induced breakdown spectrometer) has a high interference contrast, and the Mie backscatter strength is higher than the Rayleigh backscatter strength.