| 摘要 |
A device for the transit time measurement of electric, electromagnetic or acoustic signals, particularly supersonic signals, of at least one predetermined frequency range, having a signal transmitter for the sending of measurement signals to an object and a signal receiver for the receiving of the measurement signals reflected by the object which have a substantially predetermined frequency corresponding to the frequency of the other signals sent and having a time measuring device for determining the transit time of the measurement signals between the signal transmitter and/or receiver and an object, from which the distance of the object from the signal transmitter and/or the signal receiver can be derived. A signal generator is provided both at least to trigger the signal transmitter and to control the signal receiver, and a filter stage for the tuning of the signal receiver in accordance with the reception frequency and for filtering out external frequencies is connected with the signal generator.
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