Laser fresnel distance measuring system and method
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United States of America Patent
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Nov 4, 2008
Grant Date -
N/A
app pub date -
Sep 18, 2006
filing date -
Sep 18, 2006
priority date (Note) -
Expired
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Abstract
A method and system for determining range to a target are provided. A beam of electromagnetic energy is transmitted through an aperture in an opaque screen such that a portion of the beam passes through the aperture to generate a region of diffraction that varies as a function of distance from the aperture. An imaging system is focused on a target plane in the region of diffraction with the generated image being compared to known diffraction patterns. Each known diffraction pattern has a unique value associated therewith that is indicative of a distance from the aperture. A match between the generated image and at least one of the known diffraction patterns is indicative of a distance between the aperture and target plane.
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