| 摘要 |
A measuring apparatus for determining the position of a movable element with respect to a pair of spaced reference means, e.g. mirrors, rotatable around parallel shafts. The movable element 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, which detected light pulse series are supplied to a processing unit for calculating from the light pulse series and from a starting pulse the position of the movable element with respect to both mirrors.
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