Apparatus and method for distance measurement by laser interfero

Details Apparatus and method for distance measurement by laser interfero Apparatus and method for distance measurement by laser interfero

1984-03-27

1985-01-08

Arnold, Bruce Y.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356349, G01C 300

Patent

active

044924640

ABSTRACT:
The apparatus and method include adjusting two single frequency lasers to separate longitudinal modes of an interferometer, the plates of which are separated by a distance to be measured. A rough estimate of the distance is made using a tape measure or the like. The rough estimate, together with the frequency distance (.DELTA.F) of the lasers adjusted to the longitudinal modes of the interferometer is used to solve the equation: ##EQU1## where c is the speed of light and L.sub.1 is the rough estimate. The parameter k then calculated by rounding k.sub.1 to the nearest integer and the accurate distance L is calculated according to the equation: ##EQU2##

REFERENCES:
patent: 3661464 (1972-05-01), Hubbard
patent: 3970389 (1976-07-01), Mendrin et al.
Bien et al., "Absolute Distance Measurements by Variable Wavelength Interferometry", Applied Optics, vol. 20, No. 3, Feb. 1, 1981.
French Search Report.

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