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Wireless Readout of Multiple SAW Temperature Sensors
Gudrun Bruckner1, Jochen Bardong2
1Carinthian Tech Research (CTR AG), 9524 Villach, Austria. gudrun.bruckner@ctr.at.
Sensors (Basel, Switzerland)
|July 25, 2019
Summary
Surface Acoustic Wave (SAW) sensors offer robust, battery-free wireless sensing for industrial applications. Researchers developed a system for parallel readout of four temperature sensors using SAW devices in the 2.45 GHz ISM band.
Area of Science:
- Physics
- Electrical Engineering
- Materials Science
Background:
- Surface Acoustic Wave (SAW) devices are established passive wireless sensors for various physical quantities.
- SAW sensors offer advantages like robustness, battery-free operation, high-temperature capability, and high resolution.
- Industrial applications face challenges with wireless multi-sensor systems, including frequency regulations and cost.
Purpose of the Study:
- To address challenges in establishing multi-sensor wireless readout for industrial applications.
- To investigate design approaches and constraints for SAW-based industrial sensor systems.
- To demonstrate the feasibility of parallel wireless readout for multiple SAW sensors.
Main Methods:
- Utilized SAW devices based on reflective delay lines.
- Designed a system for parallel readout of independent temperature sensors.
- Operated within the 2.45 GHz Industrial, Scientific, and Medical (ISM) frequency band.
Main Results:
- Successfully designed and fabricated SAW sensors enabling parallel readout.
- Demonstrated the parallel measurement of four independent temperature sensors.
- Validated the system's performance and applicability in an industrial context.
Conclusions:
- SAW sensors are suitable for industrial applications requiring wireless multi-sensor systems.
- The developed approach overcomes limitations imposed by ISM band regulations and system costs.
- Parallel readout of multiple SAW sensors is achievable within standard ISM bands.
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