Laser doppler displacement measuring system and apparatus

Details Laser doppler displacement measuring system and apparatus Laser doppler displacement measuring system and apparatus

1986-10-20

1987-12-29

Buczinski, Stephen C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 285, G01C 308

Patent

active

047157062

ABSTRACT:
Apparatus for the precise measurement of the displacement of a moving cooperative target from a reference position, traveling, for example, over a distance of several meters, and with the measurement accuracy being better than a fraction of a millimeter. The apparatus includes a low-cost laser which generates a beam of a selected frequency. The laser beam is directed at the moving target and is reflected by the target. The apparatus also includes additional elements which measure the Doppler phase shift of the reflected laser beam so as to obtain a precise measurement of the displacement of the target with respect to the reference position.

REFERENCES:
patent: 4236819 (1980-12-01), Green
patent: 4299484 (1981-11-01), Holzapfel
patent: 4336997 (1982-06-01), Ross et al.
patent: 4466738 (1984-08-01), Huang et al.
Wang et al, "Measurement and Control of Subangstrom Mirror Displacement by Acousto-Optical Technique," Rev. Sci. Instrum, Jul. 1, 1982, pp. 963-966.

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