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Position determining system

  • US 4,231,260 A
  • Filed: 11/03/1978
  • Issued: 11/04/1980
  • Est. Priority Date: 11/03/1978
  • Status: Expired due to Term
First Claim
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1. A position determining system comprisingat least one delay means capable of supporting a signal which travels along said delay means;

  • first transducer means coupled to said delay means and capable, when activated, of producing a traveling signal having at least one selected frequency, which signal travels along said delay means;

    at least one second transducer means coupled to said delay means and responsive to said traveling signal to produce at least one electrical signal having said at least one selected frequency;

    amplifier means responsive to said at least one electrical signal and capable of producing an output signal comprising a plurality of signal components of different frequencies, at least one of said signal components having said at least one selected frequency, said at least one electrical signal being arranged to be in phase with the at least one signal component having said at least one selected frequency;

    means for supplying said output signal to said first transducer means to activate said first transducer means;

    receiver transducer means relatively movable with respect to said delay means and coupled thereto for detecting said traveling signal as it travels past said receiver transducer means;

    means for determining the delay of said detected signal as it travels from said first transducer means to said receiver transducer means whereby the position of said receiver transducer means relative to said first transducer means is determined; and

    means for substantially reducing reflections of said traveling signal in said delay means.

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