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本文对10.6μm激光大气衰减作了分析,认为10.6μm激光在大气传输时,以大气分子的吸收和气溶胶的散射衰减为主,大气分子的散射可以忽略。晴天时以吸收为主,阴霾天气时,由于气溶胶微粒密度很高,所以,以气溶胶衰减为主。介绍了在不同地区、不同气候条件下准确测量10.6μm大气衰减系数的方法,并利用这些方法,根据成都、昆明两地区的地域和气候条件,分别测量出了其大气衰减系数β。
In this paper, the attenuation of laser at 10.6μm is analyzed. It is considered that the absorption of atmospheric molecules and the scattering attenuation of aerosol at 10.6μm are dominant in the atmospheric transport, and the scattering of atmospheric molecules can be neglected. In sunny days, absorption is the main factor. In haze weather, due to the high aerosol particle density, aerosol attenuation is the main factor. The method of accurately measuring atmospheric attenuation coefficient of 10.6μm in different regions and different climates is introduced. Based on the regional and climatic conditions in Chengdu and Kunming, the atmospheric attenuation coefficient β is measured by these methods respectively.