Remote magneto-elastic analyte, viscosity and temperature sensing apparatus and associated methods of sensing
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United States of America Patent
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Jun 4, 2002
Grant Date -
N/A
app pub date -
Dec 30, 1998
filing date -
Dec 30, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An analyte, viscosity, or temperature sensing apparatus for operative arrangement within a time-varying magnetic field, including a sensor with an outer surface that is chemically, frictionally, or thermally responsive and adhered to a base magnetostrictive element, and a receiver to measure a first and second value for magneto-elastic emission intensity of the sensor taken at, respectively, a first and second interrogation frequency. A change in mass or a change in material stiffness of the sensor due to the responsiveness, the viscosity and mass density of a fluid therearound, or the temperature, can be identified. The receiver, alternatively, measures a plurality of successive values for magneto-elastic emission intensity of the sensor taken over an operating range of successive interrogation frequencies to identify a value for the sensor's magneto-elastic resonant frequency (a fundamental frequency or harmonic thereof). Several sensors in an ordered array will provide a 'package' of information.
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