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红外扫描器(图1)的任务是用景物中目标自身热辐射产生视频信号。典型的自然地表景物各部分一般均接近于300°K,且其发射率无多大变化,故红外系统必须在占主导的300°K背景中探测出极小的辐照强度差别。因此评价红外探测器的标准是在很大的平均通量中探测极小对比度的能力。由于景物的辐射图象是在红外探测器上被扫描的,故所需信号是探测器电流的变化分量,而对应于平均背景辐照的探测器平均电流则使用
The task of the infrared scanner (Figure 1) is to generate the video signal with the target's own thermal radiation in the scene. The typical natural surface features are typically close to 300 ° K for various parts and their emissivity does not change much so the infrared system must detect very small differences in irradiance over the dominant 300 ° K background. Therefore, the standard for evaluating infrared detectors is the ability to detect very small contrasts over a large average flux. Since the radiation image of the scene is scanned on the infrared detector, the desired signal is a variation of the detector current, and the average detector current corresponding to the average background radiation is used