Dirks R W, Spitzer D
Appl Opt. 1991 Feb 1;30(4):443-52. doi: 10.1364/AO.30.000443.
Transport of a small divergent (of several millirads) laser beam in shallow waters has been investigated. A simple model was developed to describe and calculate the first- and second-order power and energy flux. From evaluation of the truncation error the applicability of the second-order approach for clear waters is concluded. On the other hand, turbid waters can be treated by introducing an effective beam attenuation coefficient. The computations were performed for different geometrical configurations of a lidar system and for diverse aquatic conditions. Finally, an alternative method for remote sensing of the concentration of particulate material by an airborne lidar instrument is proposed by using off-axis detection.
对小发散角（几毫弧度）激光束在浅水中的传输进行了研究。开发了一个简单模型来描述和计算一阶和二阶功率及能量通量。通过对截断误差的评估，得出二阶方法在清澈水域的适用性结论。另一方面，对于浑浊水域，可通过引入有效光束衰减系数来处理。针对激光雷达系统的不同几何配置以及各种水生条件进行了计算。最后，提出了一种利用离轴探测通过机载激光雷达仪器遥感颗粒物浓度的替代方法。
