Process and device for optically measuring the distance and the

Details Process and device for optically measuring the distance and the Process and device for optically measuring the distance and the

1987-02-24

1990-05-22

Buczinski, Stephen C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 285, G01C 308, G01P 336

Patent

active

049281526

ABSTRACT:
A device for optically measuring the distance of a target (20) comprising a monomode coherent light source (18) means (18a, 21, 30) for periodically varying the wavelength of the light of the source, a photodetector (19) for detecting the variation in the wavelength between the light from the source (18) and that retroradiated by the target (20), and means (23, 24, 25; 33, 34, 35; 41, 43, 46) for processing the output signal of the photodetector (19) corresponding to the composite optical signal issuing from the cavity of the source of light and resulting from the re-injection into this cavity of the light retroradiated by the target (20), the frequency of the output signal of the photodetector being representative of the distance between the source (18) and the target (20).

REFERENCES:
patent: 3733129 (1973-05-01), Bridges
patent: 3811774 (1974-05-01), Honeycutt et al.
patent: 3825340 (1974-07-01), Debart
patent: 4611912 (1986-09-01), Falk et al.
Patents Abstracts of Japan, vol. 9, No. 1-9, (P-380) (1922)m 16 aout 1985; & JP-A-60 64 284 (Matsushita Denki Sangyo K.K. (12-04-1985 *Resume*.
L'Onde Electrique, vol. 51, No, 5, Mai 1971, pp. 406-410, Paris, FR; J. P. Landrot: "Radioaltimetre a Modulation de Frequence", *En entier*.

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