红外辐射大气透射比的简易计算

The Simple Method to Calculate the Atmosphere Transmittance of Infrared Radiation

简述了红外辐射在大气中传输时衰减的物理原因 ,研究了计算光谱透射比的方法。利用实验数据 ,计算得到了大气中水汽 (H2 O)、CO2 的光谱吸收系数 ,推导了水汽吸收系数与温度、相对湿度之间的关系 ,给出了在给定气象条件下计算大气透射比的方法。最后举例计算了大气在 0 .3～ 13.9μm波段的光谱透射比。

The physical reasons of attenuation when the infrared radiation transmits in the atmosphere were introduced. The methods to calculate the spectrum transmittance were studied. According to the experimental data, the absorption coefficients of H 2O and CO 2 were calculated. The relationship of H 2O absorption coefficient with the atmosphere temperature and relative humidity were deduced. The method to calculate the atmosphere transmittance was offered under certain meteorological condition. An example to calculate the spectrum transmittance ranged from 0.3 μm to 13.9 μm was given. The method is valuable in engineering application.