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Distance detecting apparatus

  • US 4,905,208 A
  • Filed: 08/04/1987
  • Issued: 02/27/1990
  • Est. Priority Date: 08/04/1987
  • Status: Expired due to Fees
First Claim
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1. A distance detecting apparatus, comprising:

  • first means for producing a cyclic output pulse;

    second means operatively connected to the first means for setting the output pulse at a first frequency and means for connecting the apparatus to a transducer to convert the output pulse to an ultrasonic signal, the first frequency being any of a plurality of transmit frequencies in a bandwidth of frequencies, said transmit frequencies being separated by increments of frequency which are small relative to the bandwidth, thereby allowing the transmit frequency to be tuned for transducers of different resonant frequencies;

    third means for receiving a return pulse and having an adjustable centre frequency of response;

    fourth means operatively connected to the third means for adjusting the centre frequency of response of the third means, so said centre frequency of response is the same as said first frequency; and

    fifth means operatively connected to the first means and the third means for measuring time between an output pulse and a return pulse and thereby a distance.

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