Scanning system for lidar

G - Physics – 01 – S

Patent

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Details

G01S 7/481 (2006.01)

Patent

CA 2668064

The present invention relates to a scanning system optimized for lidar that includes a nodding mirror, a rotary electromagnetic drive, a rotary optical encoder, and control circuitry. The rotary electromagnetic drive includes a yoke incorporating a permanent magnet, and an arm having a coil at one end of the arm. The coil is enclosed within the yoke, and an opposite end of the arm is coupled to the nodding mirror, such that movement of the coil within the yoke in response to a current causes the nodding mirror to rotate. The rotary optical encoder produces an output signal in response to rotation of the nodding mirror, which serves as feedback to the control circuitry. The control circuitry adjusts the current provided to the rotary electromagnetic drive in response to the output signal, such that the nodding mirror rotates in a reference scan pattern.

La présente invention porte sur un système de balayage optimisé pour un lidar comprenant un miroir basculant, une commande électromagnétique rotative, un codeur optique rotatif et des circuits de commande. La commande électromagnétique rotative comprend un collier de déviation comprenant un aimant permanent, et un bras ayant une bobine à une extrémité du bras. La bobine est comprise dans le collier de déviation, et une extrémité opposée du bras est couplée au miroir basculant, de telle sorte qu'un mouvement de la bobine dans le collier de déviation en réponse à un courant amène le miroir basculant à tourner. Le codeur optique rotatif produit un signal de sortie en réponse à la rotation du miroir basculant, ce qui sert de rétroaction aux circuits de commande. Les circuits de commande ajustent le courant fourni à la commande électromagnétique rotative en réponse au signal de sortie, de telle sorte que le miroir basculant tourne dans un motif de balayage de référence.

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