Non-scanning, three-axis, self-referenced heterodyn laser...

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G01P 5/00 (2006.01) G01P 5/26 (2006.01) G01P 13/02 (2006.01) G01S 17/58 (2006.01) G01S 17/87 (2006.01) G01S 7/481 (2006.01)

Patent

CA 2349260

A three-axis, non-scanning, self-referenced laser air data sensing system (10) comprises a support (12) having three separate laser diodes (56A-56C) providing beams (22A-22C) of coherent light, which beams (22A-22C) are directed toward separate beam expander mirrors (24A-24C). The expander mirrors (24A-24C) reflect an expanding beam (26A-26C) back toward a focusing mirror (28) that focuses the beams along three diverging axes (30A-30C) at known angles to each other at three separate locations in space. The focused beams (30A-30C) form small detection cell regions (32A-32C) through which particles in the fluid pass and reflect light. The reflected light is received back along the same paths (30A-30B; 26A-26C; 22A-22C) as the transmission of the source light, and is directed back toward detectors (70A-70C) on the support (12). The reflected light undergoes a Doppler shift, and this reflected light is combined with a reference signal (66A-66C) tapped from one of the other of the three coherent light sources (56A-56C) for heterodyning the signals for determining the Doppler shift and thus the relative velocity.

La présente invention concerne un système d'enregistrement de données aérodynamiques en trois axes sans balayage utilisant un laser hétérodyne à références internes (10) comprend un support (12) pourvu de trois diodes laser distinctes (56A-56C) fournissant des faisceaux (22A-22C) de lumière cohérente. Ces faisceaux (22A-22C) sont envoyés sur des miroirs dilatateurs de faisceaux (24A-24C). Les miroirs dilatateurs (24A-24C) renvoient un faisceau en dilatation sur un miroir focalisant (28) qui focalise les faisceaux selon trois axes de divergence (30A-30C) formant entre eux des angles connus en trois emplacements séparés dans l'espace. Les faisceaux focalisés (30A-30C) forment des petites régions de cellules de détection (32A-32C) par lesquels le fluide transmet et réfléchit la lumière. La lumière de réflexion est reçue en retour par les mêmes trajets (30A-30B; 26A-26C; 22A-22C) que pour l'émission de la source de lumière, à la suite de quoi elle est renvoyée sur les détecteurs (70A-70C) montés sur le support (12). La lumière de réflexion subit un décalage Doppler et vient se combiner avec un signal de référence (66A-66C) tiré de l'une des trois autres sources de lumière cohérente (56A-56C) de façon à réaliser un hétérodynage optique des signaux permettant de déterminer le décalage Doppler et donc la vitesse relative.

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