| 摘要 |
The invention provides an optical system for monitoring the position and orientation of an object in a frame of reference. The system includes at least four light sensors (10, 12, 14 and 16) (or light sources) fixed on the object in a non-coplanar arrangement, each producing a signal in response to a change in the intensity of light falling on it. The system also includes an optical scanner (18) that generates a fan-shaped light beam (20) (or acceptance beam) that scans a volume containing the object in a direction substantially perpendicular to the longitudinal axis of the beam, alternately in a first direction, and then in a second direction substantially perpendicular to the first direction; a signal generator that provides a time signal synchronized with a specific point in the scan; a timer (24) that record the times of position signals generated by the light sensors (10, 12, 14 and 16) and the time signals generated by the signal generator; and a computing device (26) that calculates the position and orientation of the object based on the times recorded by the timer (24) and the coordinates of the light sensors (10, 12, 14 and 16).
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