Outdoor range finder

G - Physics – 01 – B

Patent

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Details

G01B 11/00 (2006.01) G01B 11/02 (2006.01) G01C 3/06 (2006.01) G01C 3/08 (2006.01)

Patent

CA 2281551

A range finder for measuring a distance with a low power laser even outdoors. The range finder comprises a laser emitting means (101) which emits a pulse laser beam toward an object, an image reading means (105, 106) which takes in the image of the object synchronously with the emission and stop of the laser beam, a means (107) which detects "the minimum value of the differential image" between the images which are read by a plurality of emissions and stops of the laser beam, a means (108, 110) which determines a binary threshold from the minimum value of the differential image, and a means (114) which converts the minimum value of the differential image to binary data and detects the position where the laser beam is received.

L'invention porte sur un télémètre permettant de mesurer une distance avec un laser faible puissance, même à l'extérieur. Ce télémètre comprend un organe d'émission laser (101) qui émet un faisceau laser pulsé vers un objet, un organe de lecture d'image (105, 106) qui prend l'image de l'objet en synchronisme avec l'émission et l'arrêt du faisceau laser, un organe (107) qui détecte "la valeur minimale de l'image différentielle" entre les images qui sont lues par une pluralité d'émissions et d'arrêts du faisceau laser, un organe (108, 110) qui détermine un seuil binaire à partir de la valeur minimale de l'image différentielle et un organe (114) qui convertit la valeur minimale de l'image différentielle en données binaires et détecte la position dans laquelle est reçu le faisceau laser.

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