| 摘要 |
Two or more laser positioning systems are used to position a moving object. The system includes a laser, mirror or photodiodes sensor on three different rotation units. The unit includes two fine rotation and two coarse rotation stages. By rotating fine stages, the laser on the first rotation unit constantly emits laser beam to a mirror on the second rotation unit which is rigidly mounted on the moving object, the mirror constantly reflects laser beam onto a photodiodes sensor on the third rotation unit. The amount of rotations of fine stages and the geometry among laser, mirror and sensor gives precisely the position of the moving object. After fine rotation stages nearly reach their rotation limit, they return to their starting positions by rotating the coarse rotation stages. The fine stages in different laser positioning systems work alternatively to position a moving object in high precision.
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