Optical device for measuring moving speed of an object relative to a surface
AssigneeCommissariat a l'Energie Atomique
InventorsWilliam Fourcault, Viviane Cattin, Bernard Guilhamat
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Abstract
The invention relates to sensors of the speed of movement of a vehicle over the ground. The sensor comprises illumination means for illuminating the surface and at least one optical sensor able to detect the radiation returned by the surface. The illumination means and the optical sensor have one and the same optical axis, oblique in relation to the surface. This arrangement eliminates the risks of specular reflection dazzling the sensor while avoiding disturbance of the measurement by variations in the height of the sensor relative to the ground.
Claims11
A device for measuring the speed of an object by optical means from the observation of images of a surface relative to which the object moves, which device comprises:
- illumination means for illuminating the surface, at least one optical sensor able to detect the radiation returned by the surface and means for correlating these images, wherein the illumination means and the optical sensor have a common optical axis, oblique in relation to the surface, with an obliquity such that radiation emanating from the source and specularly reflected by the surface is not captured by the sensor.
Dependencies are inferred from the claim text.