Optics: measuring and testing – By polarized light examination – With light attenuation
Patent
1998-12-03
2000-12-26
Rosenberger, Richard A.
Optics: measuring and testing
By polarized light examination
With light attenuation
G01B 1124
Patent
active
061668109
ABSTRACT:
A method and apparatus for precision distance measurement are provided to perform accurate measurement of distance to an object according to light spots formed on the light receiving surface of a detector even when multiple reflections are involved. A beam of light emitted from a light source and reflected from the object is focused on the viewing surface as light spots through an optical member. The focal position of a reflected beam of light is determined according to a focal position detection process. When there are peaks in a luminosity curve generated on the detector, prior to performing the focal position detection process, the peaks are separated into individual light spots and a correct light spot for deriving the precise distance is selected by a selection process.
REFERENCES:
patent: 4708483 (1987-11-01), Lorenz
patent: 4961144 (1990-10-01), Ozeki et al.
patent: 4971443 (1990-11-01), Koyagi
Ishi et al., "A Laser Vision Sensor for a Tracking Robot," Covers Sensing Instrument Control Engineering Systems Information Computer Ergonomics, pp. 107-111, 1994 (w/ English Abstract).
T. Sueda, "Use and Problems of Optical Devices," Optronics, pp. 109-115, 1995 (w/ English Abstract).
Katayama Atsushi
Nakayama Joji
Nippon Telegraph and Telephone Corporation
Rosenberger Richard A.
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