Optics: measuring and testing – Range or remote distance finding – With photodetection
Reexamination Certificate
2006-09-18
2008-11-04
Tarcza, Thomas H. (Department: 3662)
Optics: measuring and testing
Range or remote distance finding
With photodetection
Reexamination Certificate
active
07446860
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.
REFERENCES:
patent: 4678324 (1987-07-01), De Witt
patent: 6323949 (2001-11-01), Lading et al.
patent: 2001/0048517 (2001-12-01), Shirai
patent: 2006/0164630 (2006-07-01), Hofbauer
Allison Stephen W.
Campbell Jonathan W.
Earl Dennis Duncan
Lehner David L.
Sanders Alvin J.
Bergen Peter J. Van
McGroary James J.
Ratcliffe Luke D
Tarcza Thomas H.
The United States of America as represented by the Administrator
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