Kreid D K
Appl Opt. 1976 Jul 1;15(7):1823-31. doi: 10.1364/AO.15.001823.
A modulated cw lidar is described for the remote sensing of atmospheric visibility. An analysis of the system response is given, optimum design parameters are established, and the theoretical capabilities of the new technique are compared with the results of previous work with similar systems. In the new technique, the output from a low power, cw laser is amplitude-modulated and transmitted by a telescope into the atmosphere where scattering and absorption occur. Backscattered light from along the visible beam path is collected and focused on a detector whose output is filtered and fed into a phase discriminator. The phase of the return signal (relative to the source) is directly related to the visibility, wherein lies the basis of this technique.
描述了一种用于遥感大气能见度的调制连续波激光雷达。给出了系统响应分析，确定了最佳设计参数，并将这项新技术的理论性能与先前类似系统的工作结果进行了比较。在这项新技术中，低功率连续波激光器的输出经过幅度调制后，由望远镜发射到大气中，在大气中会发生散射和吸收。沿可见光束路径的后向散射光被收集起来并聚焦到一个探测器上，该探测器的输出经过滤波后输入到鉴相器中。返回信号（相对于光源）的相位与能见度直接相关，这就是这项技术的基础所在。
