| 摘要 |
The invention relates to a device for speed measurement with two sensors arranged at a predetermined distance from each other in a direction of movement of an object and arranged at a distance from the surface of the object, which emit signals to an evaluation device with two input channels, the evaluation device being a delay correlator which digitizes the signals occurring at its input channels and forms a closed control loop for determining the time shift of the signals emitted by the sensors, the control loop having a phase detector for a comparison of the time shift of input signals, a controller and an adjusting circuit for the controlled variable or parameter to be controlled by the controller, the delay correlator having a shift register of a constant length and variable clock frequency, wherein a phase comparison of the instantaneous values of the digitized signals of the two sensors, one of which is delayed by the controller, can be performed by the phase detector, the clock frequency of the shift register being adjustable by the controller in a way corresponding to the delay from which the speed results.
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