温度、湿度及压强对激光在水中衰减特性的影响∗

摘要

In this paper, the attenuation characteristics of 532 nm laser beam in water under different atmospheric conditions (temperature, humidity, air pressure) are investigated experimentally. Experimental results show that the attenuation coefficient of laser beam in water is significantly influenced by the atmospheric environment. The attenuation coefficient decreases with the increase of air pressure, and increases with the increase of temperature. The maximum value of attenuation coefficient of light appears in the case of high temperature and low air pressure, while the minimum value appears in the high air pressure and low temperature. The maximum attenuation coefficient of laser in water is about three times the minimum value. The mechanisms of these phenomena are discussed. These results are valuable for Brillouin lidar to achieve the remote sensing of ocean.%从实验上研究了不同大气环境(温度、湿度、气压)条件下532 nm激光在水中的衰减特性。实验结果显示大气环境对激光的衰减系数有着重要的影响。衰减系数随大气压强的增加而减小，随温度的增加而增加，最大衰减系数出现在最高水温和最低气压条件下。当气压低并且温度高时，衰减系数最大，最大衰减系数值是最小衰减系数的三倍。在实验测量的基础上，详细分析了大气环境影响激光衰减特性的物理机理，研究结果对分析布里渊激光雷达海洋遥感探测具有重要意义。