Optical coordinate measuring system for large objects

Details Optical coordinate measuring system for large objects Optical coordinate measuring system for large objects

1992-12-07

1994-04-19

Rosenberger, Richard A.

Optics: measuring and testing

By polarized light examination

With light attenuation

356358, 356363, 356 45, 33503, 250561, G01B 1114, G01B 1102

Patent

active

053050916

ABSTRACT:
A coordinate measuring system consists of multiple optical transceivers (transmitter-receivers) mounted onto a stable reference frame such as the walls of a room. The object to be measured is touched with a hand-held measuring probe. To measure, the probe triggers the transceivers to read the distance to two retroreflectors mounted on the probe. The location of the probe tip relative to the reference frame is computed from at least six transceiver readings (three for each retroreflector). The accurate determination of the distance between the transceivers and retroreflectors is done by measuring the phase shift of a high frequency modulation superimposed on light beams. To avoid ambiguity two high frequencies are used, one for coarse and one for fine resolution. The initial location of the transceivers can be found out by measuring an accurately known object and computing the transceiver locations. The transceivers include a beam steering device to track the position of the probe.

REFERENCES:
patent: 4585350 (1986-04-01), Pryor
patent: 4621926 (1986-11-01), Merry et al.
patent: 4627722 (1986-12-01), Falk et al.
patent: 4647206 (1987-03-01), Kunzmann et al.
patent: 4790651 (1988-12-01), Brown et al.
patent: 5106192 (1992-04-01), Tucker et al.
patent: 5198877 (1993-03-01), Schulz

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