×

Temperature, stress, and corrosive sensing apparatus utilizing harmonic response of magnetically soft sensor element (s)

  • US 6,639,402 B2
  • Filed: 01/31/2002
  • Issued: 10/28/2003
  • Est. Priority Date: 01/31/2001
  • Status: Expired due to Fees
First Claim
Patent Images

1. A temperature sensing apparatus, comprising:

  • a sensor element made of a magnetically soft material operatively arranged within a first and second time-varying interrogation magnetic field, said first time-varying magnetic field being generated at a frequency higher than that for said second magnetic field;

    a receiver, remote from said sensor element, to measure intensity of electromagnetic emissions from said sensor element to identify a relative maximum amplitude value for each of a plurality of higher-order harmonic frequency amplitudes so measured; and

    a unit to determine a value for temperature using said relative maximum harmonic amplitude values identified.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×