Lidar scanning system

Details Lidar scanning system Lidar scanning system

H - Electricity

04

N

350/3.1

H04N 13/02 (2006.01) G01B 11/30 (2006.01) G01S 7/481 (2006.01)

Patent

CA 2038924

A LIDAR scanning system having a rotating multifaceted polygon mirror for transmitting modulated light from one of its facets to a surface. Diffuse light reflected off said surface is received by another facet of the polygon mirror and reflected to a photo detector. The phase difference between the transmitted and received light is then used to compute the range of the surface from the scanning system. The intensity of the returned light is used to create a gray scale image of the surface. The use of separate optical paths fro the transmitted and returned light, and a small scanned field of view results in an improved signal-to-noise ratio.

L'invention est un système de balayage à lidar qui comporte un miroir multifacette polygonal tournant dont l'une des faces transmet une lumière modulée à une surface. La lumière diffusée par cette surface est reçue sur une autre face du miroir polygonal qui la réfléchit sur un photodétecteur. Le déphasage entre la lumière transmise et la lumière réfléchie est utilisé pour calculer la distance séparant la surface du système de balayage. L'intensité de la lumière réfléchie est utilisée pour créer une image en échelle de gris de le surface en question. L'utilisation de trajets distincts pour la lumière transmise et la lumière réfléchie, ainsi que d'un champ de balayage étroit, améliore le rapport signal sur bruit.

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