Gimbaled scanning system and method

H - Electricity – 04 – N

Patent

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Details

H04N 5/225 (2006.01) H04N 3/08 (2006.01)

Patent

CA 2408259

A scanning system (10) and a method permit scanning a desired field-of-view within a maximized field-of-regard at a constant speed without reversing the scan direction about a primary axis (38). The system includes mirror (20) which rotates about the primary axis (38). The mirror (20) is supported for rotation about a flip axis (40) which is perpendicular to the primary axis (38). Rotation of the mirror (20) about the primary axis (38) is divided into a scan period during which the field-of-view is scanned by the mirror (20), and a flip period during which the mirror (20) rotates about the flip axis (40). The mirror (20) is mounted in a gimbal for independent rotation about a secondary axis (24) which is parallel to the primary axis (38). Rotation of the mirror (20) about the secondary axis (24) provides an adjustment of the mirror orientation such that at the end of the scan period the mirror (20) faces the end of the field-of-view, and at the end of the flip period the mirror (20) faces the beginning of the field-of-view.

L'invention concerne un système de balayage (10) et un procédé permettant de balayer un champ de vision désiré compris dans un champ de regard maximisé, à une vitesse constante, sans inverser la direction balayage autour d'un premier axe (38). Le système comprend un miroir (20) effectuant une rotation autour du premier axe (38). Le miroir (20) est supporté aux fins de rotation autour d'un axe de projection symétrique (40) qui est perpendiculaire au premier axe (38). Une rotation du miroir (20) autour du premier axe (38) est divisée en une période de balayage pendant laquelle le champ de vision est balayé par le miroir (20) et en une période de projection symétrique pendant laquelle le miroir (20) effectue une rotation autour de l'axe de projection symétrique (40). Le miroir (20) est monté à la Cadran, de manière à obtenir une rotation indépendante autour d'un second axe (24) qui est parallèle au premier axe (38). Une rotation du miroir (20) autour du second axe (24) permet un réglage de l'orientation du miroir, de manière qu'à la fin de la période de balayage, le miroir (20) soit en face de l'extrémité du champ de vision et qu'à la fin de la période de projection symétrique, le miroir (20) soit en face du début du champ de vision.

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