Interrogation method for passive wireless sensor interrogation system
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United States of America Patent
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Oct 23, 2012
Grant Date -
Sep 30, 2010
app pub date -
Mar 22, 2010
filing date -
Mar 25, 2009
priority date (Note) -
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Abstract
A method of wirelessly interrogating a sensing device comprising a plurality of passive sensors, to determine a measurement parameter, comprises the steps of repeatedly interrogating the sensing device using a predetermined transmission signal and detecting the response; estimating the measurement parameter for each sensor by means of an analysis of the data accumulated as a result of the interrogation step, and determining the average of the parameters derived from the estimating step for each sensor, using a weighted average, in which the weightings depend on the amplitude of the sensor response. The measurement parameter may be a resonant frequency where the passive sensors are resonant devices, and the sensors may be SAW devices.
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