US Patent Number
6639402
Publication Date
10-28-2003
Abstract
A temperature sensing apparatus including a sensor element made of a magnetically soft material operatively arranged within a first and second time-varying interrogation magnetic field, the first time-varying magnetic field being generated at a frequency higher than that for the second magnetic field. A receiver, remote from the sensor element, is engaged to measure intensity of electromagnetic emissions from the sensor element to identify a relative maximum amplitude value for each of a plurality of higher-order harmonic frequency amplitudes so measured. A unit then determines a value for temperature (or other parameter of interst) using the relative maximum harmonic amplitude values identified. In other aspects of the invention, the focus is on an apparatus and technique for determining a value for of stress condition of a solid analyte and for determining a value for corrosion, using the relative maximum harmonic amplitude values identified. A magnetically hard element supporting a biasing field adjacent the magnetically soft sensor element can be included.
Assignees
University of Kentucky Research Foundation, Lexington, KY (US)
Application Number
10/061,840
Filing Date
01/31/2002
Recommended Citation
Grimes, Craig A. and Ong, Keat Ghee, "Temperature, Stress, and Corrosive Sensing Apparatus Utilizing Harmonic Response of Magnetically Soft Sensor Element (s)" (2003). Chemical and Materials Engineering Faculty Patents. 14.
https://uknowledge.uky.edu/cme_patents/14
