Arrangement for checking dimensional accuracy

Details Arrangement for checking dimensional accuracy Arrangement for checking dimensional accuracy

1984-02-16

1985-12-03

Punter, William H.

Optics: measuring and testing

By polarized light examination

With light attenuation

350381, 356 1, G01B 1114, G01C 302, G02F 129

Patent

active

045563225

ABSTRACT:
An arrangement for measuring dimensions and/or checking the dimensional accuracy of large objects (1), such as car bodies or the like. The arrangement comprises a straight movement path (8) and one or a plurality of transmission units (10) movable along the path. During indication of each checking point which may comprise a bolt head, a suspended measuring rod (2-7) or the like, two measuring light beams are projected onto the point concerned from two different directions. When the light beams are projected, two are predetermined and one a variable of the following components: the distance between the starting positions for the first and the second light beam, the angular position between the first light beam and a line drawn between the starting positions and the angular position between the second light beam and said line. It is first ensured by movement of a transmission unit (10) that one of the light beams with a fixed angular relationship to the movement path impinges on the checking point or on a point at which, according to data for the object, the checking point should lie and subsequently the variable component is altered with a controllable control unit (11) so that the second measuring light beam also impinges on the checking point or on a point at which the checking point should lie according to data for the object.

REFERENCES:
patent: 2390652 (1945-12-01), Ives
patent: 3433139 (1969-03-01), Beyen et al.
patent: 3545086 (1970-12-01), Brill et al.
patent: 3765764 (1973-10-01), Niss
patent: 3817631 (1974-06-01), Kawahara
patent: 3918438 (1975-11-01), Hayamizu et al.
Kallard, T., "Exploring Laser Light", Optosonic Press 1977, pp. 18-19.
Lubrunie et al., "Nematic Liquid Crystal Digital Light Deflector", App. Optics, 8-1974, pp. 1802-1806.
Stocker, Jr., W. M., "Tape-Controlled `Inspector` Measures in Six Axes", American Machinist, 2-9-59, pp. 101-103.

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