Process and apparatus for three-dimensional surveying

Details Process and apparatus for three-dimensional surveying Process and apparatus for three-dimensional surveying

1988-02-04

1989-10-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356 1, G02B 2742

Patent

active

048734497

ABSTRACT:
The invention relates to process and apparatus for three-dimensional surveying by triangulation with a laser beam source. Pursuant to known practice, a laser beam scans a scene to be surveyed, by means of controlled rotary positioning of a mirror. The reflected beam is detected by a linear array of photosensitive receptors, enabling the location of the illuminated point to be determined by triangulation. Significant to the invention is the use of a secondary light source for precision measurement of the angular location of the scanning mirror, rather than relying upon controlled positioning of the mirror, which is much less accurate.

REFERENCES:
patent: 3961851 (1976-06-01), Gerharz
patent: 4102571 (1978-07-01), Hayamizu et al.
patent: 4136949 (1979-01-01), Hayamizu et al.
patent: 4146327 (1979-03-01), Harris
patent: 4373804 (1983-02-01), Pryor et al.
patent: 4456829 (1984-06-01), Fohey
patent: 4567347 (1986-01-01), Ito et al.

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