Variable pitch grating for diffraction range finding system
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United States of America Patent
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Dec 3, 2002
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N/A
app pub date -
Jun 17, 1999
filing date -
Dec 30, 1996
priority date (Note) -
Expired
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Abstract
A means for overcoming perspective foreshortening in the receiver of a diffraction range finder by use of chirp diffraction grating 121. In a diffraction range finder, a diffraction grating with variations in pitch such that the displacement of higher-order diffraction images in a receiver are separated from their associated zero-order image by an arbitrary displacement with respect to an arbitrary target distance. A system for ranging a target comprising a variable pitch grating 122 and a receiver 200 of the diffraction images formed by said grating.
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