Harwit M
Appl Opt. 1971 Jun 1;10(6):1415-21. doi: 10.1364/AO.10.001415.
Frequently one would like to know how an object appears, viewed at many different wavelengths. An optical device is described that encodes light from an extended object and focuses it onto a single detector in such a way as to provide information on both the spatial distribution of points on the object and the spectral distribution of light coming from each point on the object. The actual spatial and spectral properties of the object then are recovered by decoding the signals received by the detector. A mask pattern is described that is used in providing spatial information. It can be stepped cyclically to encode a two-dimensional pattern (intensity distribution of radiation). The pattern is simple compared to previously described masks. For an image resolved into, say, m x p spatial elements, the mask need only have (2m - 1)(2p - 1) encoding elements; this results in a considerable reduction in the cost of producing the mask. The device should have many applications, particularly in the field of satellite or space-probe surveillance. A modification of the instrument permits an analysis of the polarization of radiation in each spatial and spectral resolution element.
人们常常希望了解一个物体在许多不同波长下的外观。本文描述了一种光学装置，该装置对来自扩展物体的光进行编码，并将其聚焦到单个探测器上，以便提供有关物体上各点的空间分布以及来自物体上各点的光的光谱分布的信息。然后，通过对探测器接收到的信号进行解码，恢复物体的实际空间和光谱特性。文中描述了一种用于提供空间信息的掩模图案。它可以循环步进以编码二维图案（辐射强度分布）。与先前描述的掩模相比，该图案很简单。对于一个分解为例如m×p个空间元素的图像，掩模仅需要具有(2m - 1)(2p - 1)个编码元素；这将导致掩模生产成本的大幅降低。该装置应有许多应用，特别是在卫星或太空探测器监视领域。对该仪器的一种改进允许对每个空间和光谱分辨率元素中的辐射偏振进行分析。
