激光雷达大气湍流测量方法研究
Method of atmospheric turbulence measurement by lidar
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摘要: 报道了一种用激光雷达方法测量大气湍流的技术，利用发射激光束在空间所需位置产生一个聚焦光斑，通过此光斑处的大气分子瑞利散射机制形成一个空间的人造散射光源，接收系统对此光源的散射光进行探测，测量出从地面到此空间散射光源之间的大气湍流参数。给出了对武汉上空大气湍流测量的初步结果。得到了不同高度层的大气相干长度随时间的变化特性、平均值和起伏均方差，并对实验测量和模型计算的大气折射率结构常数在相应高度段的积分值进行了比较，二者积分值都在10-12量级，得到的结果基本相符。这种测量方法的实现，为测量空间不同方位、不同距离的大气湍流提供了一种新的手段。Abstract: A method for measuring atmospheric turbulence by lidar is reported with its principle, technology and the primary measurement results. Time variations of atmospheric coherence length measured in different altitude range, average atmospheric coherence length and the deviation of atmospheric coherence length are obtained. The integration of the measured atmospheric structure parameter is compared with that of model atmospheric structure parameter, and the roughly coincident result is obtained. The realization of this method provides a new means for the measurement of atmospheric turbulence in different direction and different altitude, and also a technical base of the laser guide star for adaptive optics.
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