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Acoustic measuring system

  • US 5,062,088 A
  • Filed: 10/09/1990
  • Issued: 10/29/1991
  • Est. Priority Date: 10/09/1990
  • Status: Expired due to Fees
First Claim
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1. Distance measuring apparatus comprising a first and second ultrasonic device each including transmitting means for emitting an ultrasonic pulse and a receiving means for receiving ultrasonic pulses, a first control means connected to said transmitting and receiving means of said first device to activate each of said transmitting and receiving means at predetermined intervals;

  • a second control means including timing means integral with said second device and responsive to signals received from said first device to activate the transmitting and receiving means of said second device at predetermined intervals;

    means for varying said predetermined time intervals as distance between the devices changes;

    means connected to said first device and responsive to reception of ultrasonic signals from said second device to measure the elapsed time from transmission of the pulse from said first device to reception of said pulse from said second device;

    means to convert the measured time lapse to a signal indicative of the distance between said devices.

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