Impedance analysis technique for frequency domain...

Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Electrical signal parameter measurement system

Reexamination Certificate

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C702S056000, C702S189000, C324S076110, C324S600000

Reexamination Certificate

active

07912661

ABSTRACT:
Circuitry and program code adapted for carrying out an associated technique for characterizing the response of one or more magnetoelastic sensor elements during exposure to an excitation field generated by an interrogation coil: including: (a) measuring a total sensor signal from the coil with the sensor element positioned within the excitation field within a spacing created by a winding of the coil; and (b) automatically determining: (i) a total measured impedance spectrum from said total sensor signal so measured, and (ii) a plurality of magnitude values representing the real part of a reconstructed impedance spectrum for the sensor element. The reconstructed impedance spectrum for the sensor element, having been calculated by subtracting an impedance generally attributable to the coil during the time an AC excitation signal is provided, from the total measured impedance. Subtraction of coil impedance from total complex impedance is accomplished by separate subtraction of the real part and of the imaginary part, represented as followsin-line-formulae description="In-line Formulae" end="lead"?Re[Zs(ω)]=Re[Zt(ω)]−Re[Zc(ω)]  Equation (12)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?andin-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?Im[Zs(ω)]=Im[Zt(ω)]−Im[Zc(ω)]  Equation (13)in-line-formulae description="In-line Formulae" end="tail"?where subscript “t” indicates total complex impedance, “s” indicates sensor element impedance, and “c” indicates coil impedance.

REFERENCES:
patent: 5295084 (1994-03-01), Arunachalam et al.
patent: 5629209 (1997-05-01), Braun, Sr. et al.
patent: 6359444 (2002-03-01), Grimes
patent: 6393921 (2002-05-01), Grimes et al.
patent: 6397661 (2002-06-01), Grimes et al.
patent: 6586946 (2003-07-01), Hefti et al.
patent: 6639402 (2003-10-01), Grimes et al.
patent: 6688162 (2004-02-01), Bachas et al.
patent: 6815947 (2004-11-01), Scheiner et al.
patent: 6861852 (2005-03-01), Slates
patent: 7113876 (2006-09-01), Zeng et al.
patent: 2001/0054896 (2001-12-01), Mednikov et al.
patent: 2004/0061511 (2004-04-01), Kawakatsu
patent: 2005/0192765 (2005-09-01), Slothers et al.
patent: 2006/0071658 (2006-04-01), Mednikov et al.
Grimes, C.A., K G. Ong, et al, “Magnetoelastic sensors for remote query environment monitoring, ”Journal of Smart Materials and Structures, vol. 8, (1999) 639-646, printed in the UK; listed in applicants' specification.
K Zeng, K.G. Ong, C. Mungle, and C A. Grimes, “Time domain characterization of oscillating sensors; Application of frequency counting to resonance frequency determination,” Rev. Sci. Instruments vol. 73, 4375-4380 (Dec. 2002); listed in applicants' specification.
Jain, M.K., C. A. Grimes, “A Wireless Magnetoelastic Micro-Sensor Array for Simultaneous Measurement of Temperature and Pressure,” IEEE Transaction on Magnetics, vol. 37, No. 4, pp. 2022-2024, 2001; listed in applicants ' Specification.
H Reindl, et al. “Theory and Application of Passive SAW Radio Transporters as Sensors,” IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, vol. 45, No. 5, (Sep. 1998).

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