Active optical measurement device with weak signal...

Details Active optical measurement device with weak signal... Active optical measurement device with weak signal...

2008-04-01

2008-04-01

Tarcza, Thomas H. (Department: 3662)

Optics: measuring and testing

Velocity or velocity/height measuring

With light detector

C356S028000

Reexamination Certificate

active

07352447

ABSTRACT:
The invention relates to an optical measurement device designed notably to evaluate the velocity of an aircraft by detection of a Doppler shift. The device for measurement by optical probe comprises at least two light beams of different wavelengths λ1 , λ2, denoted as first beam and second beam, the device illuminating a reference medium MILREF (60) by the first beam and receiving a light echo Sr reflected back by the reference medium, and the device comprising:an optical coupler COUPL (70) receiving, on the one hand, the light echo Sr reflected back by the reference medium MILREF and, on the other, the second beam, the coupler delivering a resultant wave Or comprising the second beam and the light echo Sr;an optical amplification unit AMPLI (80), of bandwidth Bopt, receiving the resultant wave Or and delivering an amplified resultant wave Ora.

REFERENCES:
patent: 4902127 (1990-02-01), Byer et al.
patent: 5172181 (1992-12-01), Morbieu et al.
patent: 5847817 (1998-12-01), Zediker et al.
patent: 6100965 (2000-08-01), Nerin
patent: 2002/0105632 (2002-08-01), Holton
patent: 2003/0151732 (2003-08-01), Rogers et al.
patent: 2004/0036852 (2004-02-01), Bruel et al.
patent: 1 055 941 (2000-11-01), None
Abstract EP 1 055 941 Nov. 29, 2000 Mitsubishi Electric Corp.

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