Velocity detector

G - Physics – 01 – P

Patent

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Details

G01P 3/36 (2006.01) G01P 5/26 (2006.01) G01S 17/58 (2006.01)

Patent

CA 2661555

Apparatus for determining the velocity and direction of a moving object, the apparatus comprising: a coherent light (L) source arranged to generate an incident beam (B) of coherent light; an optical imaging system arranged to receive light reflected from a moving object passing through the incident beam and to focus the reflected light into a magnified image of the moving image; a first optical mask (M) through which the magnified image is projected, the mask having a first region of alternating opaque and non-opaque areas having a first spacing and second region of alternating opaque and non-opaque areas having a second spacing different from the first spacing; a first light detector (D) arranged to receive the light signal transmitted through the optical mask, the light signal comprising a series of pulses, and to calculate the velocity and direction of the moving object as a function of the pulse frequency and the spacing of the opaque areas of the optical mask.

L'invention concerne un appareil de détection de la vitesse et de la direction d'un objet mobile, l'appareil comprenant: une source de lumière cohérente destinée à produire un faisceau incident de lumière cohérente; un système d'imagerie optique destiné à recevoir la lumière réfléchie par l'objet mobile qui passe à travers le faisceau incident; un premier masque optique à travers lequel l'image grossie est projetée, le masque présentant une première région alternant des zones opaques et non opaques, ces dernières présentant un premier espace, et une seconde région alternant les zones opaques et non opaques, lesquelles comportent un second espace différent du premier; un premier détecteur de lumière disposé de manière à recevoir le signal lumineux émis à travers le masque optique, le signal lumineux comprenant une série d'impulsions et permettant de calculer la vitesse et la direction de l'objet mobile en fonction de la fréquence d'impulsions et de l'espace entre les zones opaques du masque optique.

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