Method and apparatus for determining the distance between a base

Details Method and apparatus for determining the distance between a base Method and apparatus for determining the distance between a base

1997-02-12

1999-08-03

Font, F. G.

Optics: measuring and testing

By polarized light examination

With light attenuation

356 311, 35613903, G01B 1124, G02B 514

Patent

active

059332409

ABSTRACT:
The invention relates to a method and an apparatus for determining the distance (h) between a base (1) and a specular surface (2) of an object (3). The method is based on the measurement of the direct reflection of radiation of a first light source (4) by a first detector (5) and the measurement of radiation of a second light source (6), located at least approximately at the location of the first detector (5), by a second detector (7), located at least approximately at the location of the first light source (4), in order then to determine with the known geometry of the setup and the measured values obtained for the angles of appearance (.gamma., .alpha.) of the virtual images of the light sources (4, 6) the position with respect to the base (1) of the specular surface (2) to be measured.

REFERENCES:
patent: 3815994 (1974-06-01), Peckham
patent: 4281245 (1981-07-01), Brogardh et al.
patent: 4736247 (1988-04-01), Graham et al.
patent: 5146290 (1992-09-01), Hartrumpf
patent: 5414517 (1995-05-01), Furuhashi
"A Photoelectric Range Scanner Using An Array of LED Chips," by Jamusz A. Marszalec and Heimo M. Keranen, Proceedings of the International Conference on Robotics and Automation, Nice, May 12-14, 1992, Bd. vol. 1, Nr. Conf. 8, May 12, 1992, Institute of Electrical and Electronics Engineers, pp. 593-598.

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