| 摘要 |
<p>A measuring apparatus for determining the position of a movable element with respect to a pair of spaced reference means, e.g. mirrors (9,10), rotatable around parallel shafts (11,12). The movable element (4) emits a light beam from a position to both mirrors. As a result of the rotation, the two mirrors convert the reflected light beam into a light pulse series. Each of these light pulse series is detected by a detector (15,16), which detected light pulse series are supplied to a processing unit (6) for calculating from the light pulse series and from a starting pulse the position of the movable element with respect to both mirrors. <IMAGE></p> |
