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Magnetostrictive multiple position sensing device

  • US 5,050,135 A
  • Filed: 12/20/1989
  • Issued: 09/17/1991
  • Est. Priority Date: 12/20/1989
  • Status: Expired due to Term
First Claim
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1. A position monitoring device, comprising:

  • an ultrasound transducer disposed along a line;

    means for generating an ultrasound interrogation pulse along said ultrasound transducer;

    a plurality of electromagnets disposed along said line of said ultrasound transducer, each of said electromagnets selectively actuated for generating a magnetic field for interacting with said ultrasound interrogation pulse and causing generation of a reflected torsional strain pulse and twisting of said ultrasound transducer;

    sensor means for detecting the arrival of said reflected torsional strain pulse;

    means for determining a time difference interval between generation of said ultrasound interrogation wave and the arrival of said reflected torsional strain pulse; and

    means for converting said time difference interval into a position measurement.

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