Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Electrical signal parameter measurement system
Reexamination Certificate
2006-06-20
2006-06-20
Tsai, Carol S. W. (Department: 2857)
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Electrical signal parameter measurement system
C340S572100
Reexamination Certificate
active
07065459
ABSTRACT:
A method of determining the frequency of a plurality of resonant devices (for example three SAW devices) includes determining optimal interrogation frequencies for each of the devices, the optimal interrogation frequencies having maximum power spectral densities, accumulating a plurality of responses for each sensor, performing discrete Fourier transforms on the sampling results to estimate the three resonant frequencies, and averaging the results of the Fourier transforms to provide an indication of resonant frequencies. The averaging step may include the calculation of a standard deviation and the rejection of any results which fall more than a pre-determined multiple of the standard deviation from the average frequency result. The frequency determined by the method may be employed to calculate the pressure and temperature of the sensor devices. The sensor devices may be located in a vehicle tire.
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A. Pohl, G. Ostermayer and Franz Seifert; Wireless Sensing Using Oscillator Circuits Locked to Remote High-Q SAW Resonators; IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, Sep. 1998,; pp. 1161-1168; vol. 45. No. 5.
Beckley John Peter
Bown George E.
Kalinin Victor Alexandrovich
Keusey, Tutunjian & & Bitetto, P.C.
Transense Technologies Plc
Tsai Carol S. W.
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