8 December 2004 Receiver array design for conically scanned millimetre-wave imagers
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It is well known that the image detected by a camera is only a subset of the information available in a scene. The finite aperture of an optical system leads to a certain amount of diffraction and image blurring, as described by Rayleigh's diffraction criterion. The image of the scene is then sampled with a finite spatial frequency by the detector(s), be they individual elements in a CCD sensor, light-sensitive cells in the eye, or grains on a photographic film. It is important, when designing a camera system, to ensure that as much of the available image information as possible is collected by the sensor. This involves an analysis of the spatial frequencies that are present in the blurred image, and the design of the image plane detectors in order to best sample the image information. This paper describes the image sampling requirements of millimetre-wave imagers, in particular mechanically scanned imagers that use a conical scanning technique. The trade-off between the requirement to make optimum use of limited image resolution with the high cost of millimetre-wave receiver arrays is considered. Different array layouts used in existing millimetre-wave imagers are presented.
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Peter R. Coward, Rupert N. Anderton, Sean Price, "Receiver array design for conically scanned millimetre-wave imagers", Proc. SPIE 5619, Passive Millimetre-Wave and Terahertz Imaging and Technology, (8 December 2004); doi: 10.1117/12.581053; https://doi.org/10.1117/12.581053

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