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杂散辐射是指到达红外探测系统靶面的非目标成像的辐射能量。杂散辐射经过光电器件后增加了系统的噪声,降低了系统的输出信噪比,影响到红外探测系统对目标的探测能力。为了提高红外探测系统对空间弱小目标的探测能力,分析了红外探测系统的杂散辐射来源;推导了不同地理纬度、不同时刻下的红外探测系统太阳辐射入射角计算公式;分别计算了红外探测系统的太阳辐射、天空背景、热辐射噪声等效电子数;比较了杂散辐射噪声和探测器的固有噪声,分析了红外探测系统的最小噪声极限,得出地基红外探测系统的背景噪声决定了系统的探测极限。
Stray radiation refers to the non-target imaging radiant energy that reaches the target surface of an infrared detection system. Stray radiation after the photoelectric device increases the system noise, reducing the system’s output signal to noise ratio, affecting the infrared detection system on the target detection capability. In order to improve the detection ability of the infrared detection system on the small space targets, the sources of spurious radiation in the infrared detection system are analyzed. The formula of the incident angle of the solar radiation in the infrared detection system at different geographical latitudes and different times is deduced. The infrared detection system The solar radiation, the sky background and the equivalent number of thermal radiation noise were compared. The stray radiation noise and the intrinsic noise of the detector were compared, and the minimum noise limit of the infrared detection system was analyzed. The background noise of the infrared detection system of the foundation was determined, The detection limit.