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Apparatus-for-remote-distance-measurement

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Apparatus for remote distance measurement

Details

Inventors: Koelpin, Thomas; Forster, Alfred;
Assignee: Siemens Aktiengesellschaft (Berlin and Munich, DE)
Primary Examiner: Williams; Hezron E.
Assistant Examiner: Arana; Louis M.
Attorney, Agent or Firm: Kenyon & Kenyon

An apparatus for remote distance measurement varies the decay time of an electronic transducer to measure the distance to objects that are close to the transducer. The decay time for the amplitude of the oscillations of the transducer is varied by changing the transmitting frequency of the transducer since the rate at which the transducer oscillations decay depends on the transmitting frequency. The frequency is changed using a circuit comprising an electroacoustic transducer, a generator, a receiving amplifier and a control circuit. The generator generates an oscillation signal having a constant transmitting frequency and constant amplitude for a given transmitting time that depends on the distance of the object from the transducer. The transmitting frequency is chosen to measure the distance to a close object so that the transducer amplitude decays so fast that the echo signal can be received and evaluated without interference. The circuit for the remote distance measurement apparatus has particular application in motor vehicles.

DETAILED DESCRIPTION The present invention provides an apparatus for remote distance measurement in which the decay time of the transducer is variable and is therefore suitable for detecting objects that are near.
The invention solves the problem mentioned above by using the generator to excite the transducer at a transmitting frequency that is chosen in such a way that the corresponding decay time of the transducer oscillation is shorter at shorter object distances than for longer distances.
The damping coefficient of the transducer oscillation can advantageously depend on the oscillation frequency.
An appropriate choice of the transmitting frequency can make the decay time of the transducer smaller for shorter object distances than for longer distances.
If the generator comprises a controlled oscillator and an output amplifier, the excitation of the transducer can be independent of the transmitting frequency at a constant voltage amplitude.
The influence of the oscillation frequency on the decay time is utilized to advantage because the transmitting frequency corresponding to the resonance frequency of the converter increases when going to a shorter object distance.
A transducer that oscillates at a higher frequency has a shorter decay time than at a lower frequency given a constant damping resistance.

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