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红外辐射在大气的传输过程中,受到大气分子对光谱的选择性吸收,以及大气环境、距离等影响,使得大气透过率成为一个复杂的参量。采用光谱间隔等分方法,给出了红外成像系统作用距离新的估算方程和求解方法。利用MODTRAN软件计算出微小光谱区域的大气透过率,利用所编计算程序调用计算值,计算各微小光谱区域的红外辐射,对各微小光谱区域的计算数据求和,取代了采用常数或平均大气透过率的常用计算方法,提高了计算的准确度。综合考虑了大气能见度、海拔高度、天顶角和空间频率等多种因素对热成像系统作用距离的影响,给出了作用距离估算实例及结果。
Infrared radiation in the atmospheric transmission process, by the atmospheric molecules on the selective absorption of the spectrum, as well as the atmospheric environment, distance and other effects, making the atmospheric transmittance becomes a complex parameter. Using spectral interval method, a new estimation equation and solving method for the distance of infrared imaging system are given. Use MODTRAN software to calculate the atmospheric transmittance of the tiny spectral region, calculate the infrared radiation of each tiny spectral region by using the calculated calculation program to call the calculated value, and sum the calculated data of each small spectral region instead of using constant or average atmosphere The commonly used calculation method of transmittance improves the accuracy of calculation. Considering the influence of atmospheric visibility, altitude, zenith angle and spatial frequency on the working distance of thermal imaging system, examples and results of distance estimation are given.