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温度灵敏度是红外遥感系统和红外热成象系统的重要参数之一,高的温度更敏度是这些仪器设计的主要目标,为获得高的温度灵敏度,就要分析影响系统的各种因素。在系统设计阶段,采用噪声等效温差(NETD),作为性能参数的衡量和性能试验的判断提供依据是适当的。本文分析了红外遥感和热成象系统的NETD方程中各参数的影响及影响的程度;如并扫、串扫、串-并扫、探测器的数目、光学特性以及目标特性的影响。工作波段的选择对温度灵敏度也有较大影响,如采用多波段同时工作,可提高对比度和对目标的分辨识别的能力。
Temperature sensitivity is one of the important parameters of infrared remote sensing system and infrared thermal imaging system. High temperature sensitivity is the main goal of these instrument designs. To obtain high temperature sensitivity, it is necessary to analyze the various factors that affect the system. In the system design stage, the use of noise equivalent temperature difference (NETD) as a measure of performance parameters and performance testing to provide the basis for judgments is appropriate. In this paper, the influence of each parameter in the NETD equation of infrared remote sensing and thermal imaging system and the degree of influence are analyzed; such as sweep and sweep, string and sweep, the number of detectors, optical characteristics and target characteristics. The choice of working band also has a greater impact on temperature sensitivity, such as the use of multi-band work at the same time, can improve the contrast and recognition of the target’s ability to distinguish.