Method of measuring length and coordinates using laser...

Details Method of measuring length and coordinates using laser... Method of measuring length and coordinates using laser...

2005-03-22

2005-03-22

Bruce, David V. (Department: 2882)

Optics: measuring and testing

Range or remote distance finding

With photodetection

C359S490020

Reexamination Certificate

active

06870605

ABSTRACT:
A laser tracking interferometric length measuring instrument has a laser source and a tracking articulating optical lever provided on an optical path of an interferometric optical system. To track a retroreflector, the optical lever reflects a laser beam at the retroreflector, which reflects the beam back to the optical lever. This beam is reflected onto a quadrant photodiode. An attitude control means is used to control the attitude of the optical lever so that the laser beam reflected by the optical lever falls on the neutral point of the photodiode.

REFERENCES:
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patent: 4707129 (1987-11-01), Hashimoto et al.
patent: 4714339 (1987-12-01), Lau et al.
patent: 4790651 (1988-12-01), Brown et al.
patent: 5092898 (1992-03-01), Bekki et al.
patent: 5920394 (1999-07-01), Gelbart et al.
patent: 2795612 (1998-06-01), None
patent: 2795613 (1998-06-01), None

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