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本文我们介绍多光谱扫描器的设计和性能。空间实验室多光谱扫描器(S—192)是由一台象平面扫描器(望远镜),一台使辐射分离成13种光谱带的光谱仪和一个13单元(Hg、Cd)Te 探测器阵列组成的。象平面扫描器是一种新的系统,它根据三个互相关联的主要特征:(1)用反射元件适应史密特原理;(2)圆锥形的行扫描,用它将所有的场单元引到轴上并校正;和(3)扫描装置,在这个装置中固定在中继部件上的系统的孔径光阑被成象在球面主镜的曲率中心上。当用虚光阑替换用在古典史密特结构上的具体光阑的时候,便使系统变成更紧凑。由于象平面扫描和史密特对称,系统以大的半径角(11°直径)和非常高的速度(6000转/分)用比较小的扫描镜和大的入射光瞳(43厘米)来扫描。光谱仪把辐射分成13种光谱带,其中之12种固定在0.4和2.35微米之间,而其另一条在10.2—12.5微米。二色分束器将12种较低波长带与远红外带分开,这12种较低波长带是用棱镜来作色散的。实际飞行记录的照片重现示出在440公里高度上有80米分辨率。
In this article we introduce the design and performance of multispectral scanners. The Space Laboratory Multispectral Scanner (S-192) consists of an image plane scanner (telescope), a spectrometer that separates the radiation into 13 spectral bands and a 13-element (Hg, Cd) Te detector array of. Image plane scanners are a new system based on three interrelated main features: (1) the use of reflective elements to adapt to the Smith principle, (2) conical line scanning, which uses all of the field elements To the axis and corrected; and (3) scanning means in which the aperture stop of the system fixed to the relay member is imaged on the center of curvature of the spherical primary mirror. When a diaphragm is replaced with a virtual diaphragm for a particular aperture on a classical Schmidt structure, the system becomes more compact. The system scans with a small scan mirror and a large entrance pupil (43 cm) with a large radius angle (11 ° diameter) and very high speed (6000 rpm) due to the image plane scan and the Smith Symmetry . The spectrometer splits the radiation into 13 spectral bands, 12 of which are fixed between 0.4 and 2.35 microns and the other at 10.2-12.5 microns. The dichroic beam splitter separates the 12 lower wavelength bands from the far infrared bands, which are used for dispersion by the prism. Photograph reproduction of the actual flight record shows a resolution of 80 meters at a height of 440 km.