利用光谱等分法对红外系统作用距离的计算  

Calculation of operating range of infrared system using spectrum interval bisection method

作　　者：贾全涛[1] 吴平[1] 马鹤[1] 

机构地区：[1]南京航空航天大学理学院,江苏南京210016

出　　处：《红外与激光工程》2012年第10期2600-2603,共4页Infrared and Laser Engineering

基　　金：江苏省电磁波先进调控技术重点实验室开放基金(2011ESE002)

摘　　要：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。The infrared radiation flux in the atmosphere is determined by the selective absorption of the gas molecules, the atmospheric environment, and the transmission distance of the radiation, etc, so the atmospheric transmittance is an intricate parameter. A new assessment method of the operating range of the infrared image system based on the method of the equal spectral interval segments was described The atmospheric transmittance of the little segments were calculated by the MODTRAN software and were used to calculate transmitting infrared energy in the segments. The calculated data of the segments were summed up and used to calculate the operating range of the infrared image system. Instead of using a constant or average atmospheric transmittance in traditional method, the accuracy of the operating range obtained from the new method was improved. Considering factors which might affect the distance of image system, such as atmospheric visibility, altitude, targets zenith angle and spatial frequency, a real world example based on this method and its results were put forward.

关 键 词：大气透过率 点源目标 作用距离 MODTRAN 红外成像系统 

分 类 号：TN219[电子电信—物理电子学]