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Passive surface acoustic wave sensing system

  • US 8,384,524 B2
  • Filed: 11/25/2009
  • Issued: 02/26/2013
  • Est. Priority Date: 11/26/2008
  • Status: Active Grant
First Claim
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1. A sensing system comprising:

  • a plurality of surface acoustic wave based sensors, each of the surface acoustic wave based sensors including a sensor coil and a surface acoustic wave device, wherein each sensor coil, when energized, is configured to energize and interrogate the corresponding surface acoustic wave device to obtain a corresponding sensor value, wherein each sensor coil can be energized through inductively coupling;

    an electronic reader including;

    a plurality of reader coils, wherein when the electronic reader is aligned with the plurality of surface acoustic wave based sensors, each of the plurality of reader coils of the electronic reader is aligned with and inductively coupled to a corresponding one of the sensor coils of the plurality of surface acoustic wave based sensors;

    a multiplexer coupled to the plurality of reader coils;

    a memory;

    a controller coupled to the multiplexer and the memory;

    wherein;

    the controller is configured to control the multiplexer such that the multiplexer energizes only one of the plurality of reader coils at a given time to read the sensor value from the energized one of the plurality of surface acoustic wave based sensors; and

    the memory stores one or more calibration coefficients for each of the plurality of surface acoustic wave based sensors, the controller is configured to retrieve one or more of the calibration coefficients from the memory, and apply the calibration coefficients to the sensor values interrogated from the corresponding surface acoustic wave based sensors.

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