Method and apparatus for sensing environmental conditions
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United States of America Patent
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Dec 25, 2018
Grant Date -
Nov 16, 2017
app pub date -
Jul 31, 2017
filing date -
Nov 18, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
A wireless sensor includes a radio frequency (RF) receiving circuit including a plurality of components, where impedances of the plurality of components establish a resonant frequency of the RF receiving circuit. The wireless sensor further includes a sensing element that when exposed to an environmental condition, affects the resonant frequency of the RF receiving circuit. The wireless sensor further includes a processing module that is operable to determine a first value for an adjustable element of a plurality of elements for a known environmental condition based on the resonant frequency and the carrier frequency, determine a second value for the adjustable element for an unknown environmental condition based on the resonant frequency and the carrier frequency, and determine a difference between the first and second values that corresponds to a change between the known environmental condition and the unknown environmental condition.
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