Method and lidar system for measuring air turbulences on...

Details Method and lidar system for measuring air turbulences on... Method and lidar system for measuring air turbulences on...

G - Physics

01

S

G01S 17/95 (2006.01) G01P 5/26 (2006.01)

Patent

CA 2615950

The invention relates to a method for measuring air turbulences with a lidar system, particularly on board aircraft during which a pulsed expanded laser beam (12) of a predetermined wavelength is emitted up to a spatial area and light backscattered from this spatial area is received. At a first point in time t1 and at a second point in time t2 after emitting a laser pulse (L), the intensity distribution in the cross-section of the backscattered light is measured, and an air turbulence in a measuring field defined by points in time t1 and t2 is determined from the comparison of both intensity distributions. Images of speckle patterns are recorded with the aid of cameras (21, 22). An evaluation unit (30) conducts a cross correlation in order to render the turbulence visible and to display it on a monitor (35).

L'invention concerne un procédé pour mesurer des turbulences d'air au moyen d'un système Lidar, notamment à bord d'aéronefs, procédé selon lequel un rayon laser (12) élargi pulsé de longueur d'ondes donnée est envoyé dans une zone spatiale et de la lumière diffusée en retour de cette zone spatiale est reçue. A un premier moment (t1) et à un deuxième moment (t2) après l'envoi d'une impulsion laser (L), la répartition de l'intensité est mesurée dans la section transversale de la lumière diffusée en retour et la comparaison des deux répartitions d'intensité permet de déterminer une turbulence d'air dans un champ de mesure défini par les moments (t1) et (t2), des images de motifs de taches étant prises au moyen de caméras (21, 22). Une unité d'évaluation (30) effectue une corrélation croisée pour rendre les turbulences visibles et les afficher sur un écran (35).

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