| 摘要 |
A non-contacting measuring apparatus for measuring a displacement in dependence on the incidence of a laser beam on a laser beam detector, e.g., for determining dimensions, the position or the spacing of objects, comprises a scanning unit for moving a laser beam, which has been emitted by a laser and projected across a measuring area from one edge thereof, and a receiver, which is disposed on the other side of the measuring area and arranged to receive said laser beam. Said receiver comprises a detector for generating an output signal in response to the incidence and nonincidence of said laser beam on said detector. A measuring circuit is responsive to said output signal. To provide such a measuring apparatus which is structurally simple and has a wide field of application and can be designed to have a large measuring area, a beam-transmitting element of the scanning unit and an associated beam-receiving element of the receiver, which includes also the detector, are movable parallel to each other and in synchronism with each other in a direction which is normal to the direction in which the laser beam is projected across the measuring area. At least one of the transmitting and receiving elements is coupled to a length-measuring system, which includes an indicating or evaluating circuit that is controlled by the detector and constitutes a part of the measuring circuit.
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