论红外探测系统的作用距离(下)

On the Operating Range of Infrared Detection Systems(Ⅱ)

红外探测系统包括用于点源目标的探索系统和用于扩展源目标的热成像系统。作为一个系统级的性能描述参数,作用距离可用于表征探测过程的质量。探测器作用距离方程取决于目标是点源还是扩展源,同时还取决于所期望的是辐射能量形式还是光子形式。介绍了不同条件下的作用距离方程。讨论了系统参数(比如光学系统的F/#、直径和探测器张角等)对搜索系统和热成像系统作用距离的影响。介绍了对红外探测系统作用距离的理解和体会。

Infrared detection systems include the systems for detecting point targets and the thermal imaging systems for detecting extended source targets. As a system-level performance description pa- rameter, the operating range can be used to characterize the quality of a detection process. The equation of the operating range for a detector depends on whether the source is a point one or an extended one. Besides, it also depends on whether the desired energy is a radiation energy form or a photon form. The operating range equations under different conditions are presented. The influence of system parameters, such as the F/~ and diameter of optics and the field angle of a detector, on the operating range of both a search system and a thermM imaging system is discussed. Finally~ the understanding and comprehension for the operating range of infrared detection systems are given.