Method and device for detecting motion

G - Physics – 06 – F

Patent

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G06F 3/03 (2006.01) G01P 3/36 (2006.01) G01S 17/58 (2006.01)

Patent

CA 2757043

A method for detecting motion direction of an object (4) comprises the steps of: laser output light (L1) is generated, using a semiconductor laser (2) having a thermal response frequency (fr); - the laser is driven with rectangularly modulated DC current (I) having a modula-tion frequency higher than said thermal response frequen-cy (fr) and preferably higher than twice said thermal re-sponse frequency (fr), such as to triangularly modulate the wavelength of the laser output light; the laser output light is directed to the object; - a portion of reflected light (L3) is allowed to interfere with light (LO) within the laser; a portion of the laser light is used as measuring beam (5); the frequency spectrum of the measuring beam (5) is ana-lyzed in conjunction with the modulated laser current in order to determine the direction of movement of the object (4).

Un procédé pour détecter une direction de mouvement d'un objet (4) comprend les étapes consistant à : - générer une lumière laser de sortie (L1), au moyen d'un laser à semi-conducteurs (2) ayant une fréquence de réponse thermique (fr); - activer le laser avec un courant continu modulé rectangulairement (I) ayant une fréquence de modulation supérieure à ladite fréquence de réponse thermique (fr) et de préférence supérieure à deux fois ladite fréquence de réponse thermique (fr), de manière à moduler triangulairement la longueur d'onde de la lumière laser de sortie; - diriger la lumière laser de sortie vers l'objet; - permettre qu'une partie de la lumière réfléchie (L3) interfère avec la lumière (L0) dans le laser; - utiliser une partie de la lumière laser en tant que faisceau de mesure (5); - analyser le spectre de fréquence du faisceau de mesure (5) conjointement avec le courant laser modulé afin de déterminer la direction de mouvement de l'objet (4).

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