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由于制冷探测器焦平面制作工艺的缺陷,使其各部分组分不会完全相同,从而导致焦平面在进行光电转换时各个位置的光电流大小存在差异.本文以国产640×512中波凝视型制冷热像仪整机研制项目为基础,通过对探测器接收红外辐射并转换为光电流的过程中主要参量与焦平面材料Hg1-xCdxTe中组分x的关系进行分析,推导出探测器焦平面光电流与组分x的关系模型.在探测器能够正常工作的宽温度范围内利用黑体面源对探测器进行照射,采集各个温度点下探测器输出数据,并对本探测器整体响应特性及单个像素点的响应特性进行分析.根据影响光电流的最主要的参量变化情况,提出了双指数曲线模型来描述实际响应数据,并通过大量的数据和图表分析,证明了该模型能够提高对探测器实际响应描述的精确程度,对实际的工程应用具有指导意义.
Due to the defects of the fabrication process of the focal plane of the refrigerant detector, the components of each part of the detector will not be completely the same, resulting in the difference of the photocurrent in each position of the focal plane during photoelectric conversion.In this paper, Based on the whole development project of the thermal imaging camera, by analyzing the relationship between the main parameters of the detector and the component x in the focal plane material Hg1-xCdxTe when the infrared radiation is received by the detector and converted to photocurrent, the detector focal plane Photocurrent and component x of the relationship between the model in the detector to work within a wide temperature range using blackbody surface source of the detector irradiation, acquisition of the detector output data at each temperature point, and the detector overall response characteristics and a single According to the change of the most important parameter affecting the photocurrent, a double exponential curve model is proposed to describe the actual response data, and through a large amount of data and chart analysis, it is proved that the model can improve the detection accuracy of the detector The accuracy of the actual response description is instructive for practical engineering applications.