Systems II. Imaging
To this point, we have considered optical systems that use a single detector element or at most four detectors in a quadrant array for angle measurement. In any event, the detector element or elements are read out individually and then electrically processed. Here we consider imaging systems, where a detector array or continuous detector surface can produce an electrical signal defining a one- or two-dimensional optical image at the focal plane of a receiver or camera. In an array of discrete detectors, the resolution is determined by the spacing of the detectors. In a continuous surface medium such as that of an electron-beam scanned vidicon, the resolution may be stated in terms of the spacing of the pixels or ...
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