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本文提出的是用于目标识别的前视红外系统(FLIR)的设计,首先是根据目标与背景之间可能存在的温度差(△T_B),大气透过率(t_a)和系统所要求的识别概率(P_d)求出系统所需的最小可分辨温度差(MRTD);其次是确定被研究的目标在已知距离上满足某种分辨性能要求(如对目标进行探测、识别和辨认等)的空间频率(f_T);然后,由系统提供的参数、光学系统和探测器性能计算出表征系统热灵敏度的噪声等效温度差(NETD),基于这样的方法导出一系列设计公式,并给出设计方框图和步骤。
This paper presents the design of FLIR for target recognition. Firstly, based on the possible temperature difference between target and background (ΔT_B), atmospheric transmittance (t_a) and the system identification (P_d) to find the minimum temperature difference (MRTD) required by the system; secondly, to determine whether the studied target satisfies certain resolution performance requirements (such as detecting, recognizing and recognizing the target) at the known distance (F_T). Then, the noise equivalent temperature difference (NETD), which characterizes the thermal sensitivity of the system, is calculated from the parameters provided by the system, the optical system and the detector performance. Based on this method, a series of design formulas are derived and the design is given Block diagram and steps.