Laser gated camera imaging system and method

G - Physics – 01 – S

Patent

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Details

G01S 17/89 (2006.01) G01S 7/486 (2006.01)

Patent

CA 2516070

A gated camera imaging system and method, utilizing a laser device for generating a beam of long duration laser pulses toward a target. A camera receives the energy of light reflexes of the pulses reflected from the target. The camera gating is synchronized to be set OFF for at least the duration of time it takes the laser device to produce a laser pulse in its substantial entirety, including an end of the laser pulse, in addition to the time it takes the laser pulse to complete traversing a zone proximate to the system and back to the camera, and set ON for an ON time duration thereafter until the laser pulse reflects back from the target and is received in the camera. The laser pulse width substantially corresponds to at least the ON time duration. Preferably, the laser device includes a Diode Laser Array (DLA).

Cette invention concerne un système d'imagerie par caméra faisant intervenir un dispositif laser pour générer un faisceau d'impulsions laser longue durée vers une cible. Une caméra reçoit l'énergie des reflets lumineux d'impulsions réfléchies par la cible. Le système de déclenchement de la caméra est synchronisé de manière à être coupé (OFF) pendant la durée qu'il faut au dispositif laser pour produire une impulsion laser dans sa quasi totalité, fin de l'impulsion y compris, en plus du temps requis par cette impulsion pour traverser une zone proche du système et de revenir à la caméra, et être activé (ON) pendant un certain temps, jusqu'à ce que l'impulsion laser soit réfléchie par la cible et revienne à la caméra. La largeur de l'impulsion laser correspond sensiblement à au moins une durée d'activation. Le dispositif laser comprend de préférence un ensemble de laser à diode (DLA).

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