| 摘要 |
An optical positioning system is provided in which an optical positioning target is used to determine the mis-alignment of a light beam. The optical position target comprises a rotary member 1 with respectively a spoke slit 2 and a spiral slit 3. These slits 2, 3 allow a presented light beam to separately pass through in order to be detected by respective light sensors for each slit 2, 3. Thus, by rotation of the rotary member 1 a unique combination of angular presentations of that member 1 is provided at which a light beam striking the member 1 passes separately through each slit 2, 3. In such circumstances, this unique combination of angular positions of the member 1 enables a controller to determine the strike position of the light beam and so the mis-alignment of the light beam source from the optical target location. The slits may direct incident light along tunnels (figure 2,11,12) to detectors attached to the target. |
