G - Physics – 01 – S
Patent
G - Physics
01
S
G01S 17/32 (2006.01) G01B 11/02 (2006.01) G01C 3/08 (2006.01) G01J 1/02 (2006.01) G11B 23/00 (2006.01)
Patent
CA 2255097
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.
Katayama Atsushi
Nakayama Joji
Marks & Clerk
Nippon Telegraph And Telephone Corporation
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