多光谱扫描仪整机传递函数和最小可分辨温差的计算

The Calculation of Modulate Transfer Function and Minimum Resolvable Temperature Difference of Multispectral Scanner

本文系统地讨论了红外整机各部分调制传递函数的表达式(特别是列阵探测器的调制传递函数的表达式)以及机载热成象系统的噪声等效温差和最小可分辨温差的表达式。以上海技术物理研究所最近研制成功的多光谱扫描仪为例,在用电子计算机算出该仪器的光学系统的弥散盘之后,计算了这些系统参数,并与实验结果作了比较,二者符合得较好。

This paper gives a systematic discussion on the formulae of modulate transfer functions (MTF) of infrared system (including the detector array), noise equivalent temperature difference (NETD) and minimum resolvable temperature difference (MRTD) for airborne thermal imaging system. As an example, the MTF, NETD and MRTD of a multispectral scanner are calculated. They are compared with the experimental results and proved themselves closely consistent.