PASSIVE SURFACE ACOUSTIC WAVE SENSING SYSTEM
First Claim
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, wherein a sensor value for the corresponding surface acoustic wave based sensor can be interrogated from the corresponding surface acoustic wave based sensor by energizing the corresponding sensor coil through inductively coupling;
an electronic reader including;
a plurality of reader coils;
a multiplexer coupled to the plurality of reader coils;
a memory;
a controller coupled to the multiplexer and the memory;
the plurality of reader coils are configured to inductively couple to only one of the sensor coils of the surface acoustic wave based sensors at a given time;
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;
the memory includes one or more calibration coefficients for 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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Abstract
The present disclosure relates generally to wireless detection systems. In one illustrative embodiment, a wireless detection system includes a plurality of surface acoustic wave (SAW) sensors, and an electronic reader for interrogating the plurality of SAW sensors. In some instances, each of the surface acoustic wave based sensors includes an integrated sensor coil. The electronic reader may include a plurality of reader coils and a controller. The controller may be configured to interrogate the plurality of surface acoustic wave based sensors using a time division interrogation. In some cases, each of the plurality of reader coils is inductively coupled to only one of the integrated coils of the SAW sensors at any given time.
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Citations
20 Claims
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1. A sensing system comprising:
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a plurality of surface acoustic wave based sensors, each of the surface acoustic wave based sensors including a sensor coil, wherein a sensor value for the corresponding surface acoustic wave based sensor can be interrogated from the corresponding surface acoustic wave based sensor by energizing the corresponding sensor coil through inductively coupling; an electronic reader including; a plurality of reader coils; a multiplexer coupled to the plurality of reader coils; a memory; a controller coupled to the multiplexer and the memory; the plurality of reader coils are configured to inductively couple to only one of the sensor coils of the surface acoustic wave based sensors at a given time; 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; the memory includes one or more calibration coefficients for 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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A detection system comprising:
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a plurality of sensors, each of the plurality of sensors including a surface acoustic wave device and a corresponding sensor coil, wherein the sensor coil, when energized, is configured to energize and interrogate the corresponding surface acoustic wave device; a plurality of reader coils, each of the plurality of reader coils, when energized, is configured to energize one of the sensor coils through inductively coupling and interrogate the corresponding surface acoustic wave device; and a controller coupled to the plurality of reader coils, wherein the controller is configured to sequentially energize the plurality of reader coils to sequentially energize and interrogate each of the corresponding plurality of sensors. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A wireless detection system comprising:
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a plurality of surface acoustic wave based sensors, each of the surface acoustic wave based sensors including a sensor coil; an electronic reader including a plurality of reader coils and a controller, wherein each of the plurality of reader coils are configured to inductively couple to a corresponding one of the sensor coils; and the controller is configured to sequentially activate the plurality of reader coils to sequentially interrogate the plurality of surface acoustic wave based sensors using time division interrogation. - View Dependent Claims (19, 20)
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Specification