探测条件对红外热成像系统MRTD影响的研究  

Effect of detection conditions on MRTD of infrared thermal imaging system

作　　者：高怀平[1] 吴平[1] 张立帅[1] 

机构地区：[1]南京航空航天大学理学院,江苏南京211100

出　　处：《激光与红外》2016年第1期67-71,共5页Laser & Infrared

摘　　要：在考虑目标的尺寸、探测等级、探测概率及大气环境等因素情况下,研究了热成像系统的最小可分辨温差(MRTD),建立了一个改进的MRTD模型。由于大气透过率与波长和距离相关,利用光谱等分法计算大气透过率,将探测波长范围等分为一个个窄波段,利用MODTRAN软件计算在一定大气条件和距离下每个窄波段的大气透过率。通过调用对应波长的透过率,计算了探测波长范围内热成像系统的MRTD,提高了MRTD的准确性和适用性。Considering the factors such as the size of the target, the level of detection, detection probability and atmospheric environment ,minimum resolvable temperature difference（MRTD） of thermal imaging systems is studied. An improved MRTD model is established. As atmospheric transmittance is related to wavelength and distance, atmospheric transmittance is calculated by spectral bisection method. Detection wavelength range can be divided into a series of equal narrow bands. The atmospheric transmittance of each narrow band is calculated by MODTRAN in a certain atmospheric condition and distance. Through the corresponding wavelength transmittance, MRTD of thermal imaging system is calculated. The accuracy and applicability of MRTD are improved by this method.

关 键 词：红外热成像系统 MRTD 光谱等分法 大气透过率 MODTRAN 

分 类 号：TN216[电子电信—物理电子学]