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在直接测风激光雷达的接收光路中安装CCD监视器,发现了入射到标准具上光斑的形状及其强度分布对标准具透过率曲线产生的影响。理论分析表明:入射光斑影响了双Fabry-Perot标准具的频谱间距和透过率曲线的形状,双边缘直接测风激光雷达由此将引入较大的系统误差。另外,由于强度分布的随机性,使系统的校准常数失去实际意义。通过在传导光纤上安装扰模器,并在反演风速时引入强度分布函数,可以减小光斑引起的误差。理论和实验表明,文中方法对直接探测测风激光雷达的精度有直接影响。
A CCD monitor was installed in the receiving optical path of the direct wind laser lidar, and the effect of the shape of the spot incident on the etalon and its intensity distribution on the transmittance of the etalon was found out. The theoretical analysis shows that the incident spot affects the shape of the spectral spacing and the transmittance curve of the dual Fabry-Perot etalon, which will introduce larger systematic errors. In addition, due to the randomness of the intensity distribution, the calibration constants of the system lose their practical significance. By installing a scrambler on the conducting fiber and introducing the intensity distribution function when inverting the wind speed, the error caused by the flare can be reduced. Theoretical and experimental results show that the method in this paper has a direct impact on the accuracy of direct detection of wind-lidar.