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Reader Architectures for Wireless Surface Acoustic Wave Sensors

1
Institute for Electronics Engineering, Friedrich-Alexander University Erlangen-Nuremberg (FAU), 91058 Erlangen, Germany
2
RSSI GmbH, Bürgermeister-Graf-Ring 1, 82538 Geretsried, Germany
3
Department of General Electrical Engineering and Measurement Technology, Brandenburg University of Technology, 03046 Cottbus, Germany
*
Author to whom correspondence should be addressed.
Sensors 2018, 18(6), 1734; https://doi.org/10.3390/s18061734
Received: 3 May 2018 / Revised: 24 May 2018 / Accepted: 25 May 2018 / Published: 28 May 2018
(This article belongs to the Special Issue Surface Acoustic Wave and Bulk Acoustic Wave Sensors)
Wireless surface acoustic wave (SAW) sensors have some unique features that make them promising for industrial metrology. Their decisive advantage lies in their purely passive operation and the wireless readout capability allowing the installation also at particularly inaccessible locations. Furthermore, they are small, low-cost and rugged components on highly stable substrate materials and thus particularly suited for harsh environments. Nevertheless, a sensor itself does not carry out any measurement but always requires a suitable excitation and interrogation circuit: a reader. A variety of different architectures have been presented and investigated up to now. This review paper gives a comprehensive survey of the present state of reader architectures such as time domain sampling (TDS), frequency domain sampling (FDS) and hybrid concepts for both SAW resonators and reflective SAW delay line sensors. Furthermore, critical performance parameters such as measurement accuracy, dynamic range, update rate, and hardware costs of the state of the art in science and industry are presented, compared and discussed. View Full-Text
Keywords: surface acoustic waves; transceiver architecture; temperature sensor; pressure sensor; torque sensor; wireless sensor; frequency measurement surface acoustic waves; transceiver architecture; temperature sensor; pressure sensor; torque sensor; wireless sensor; frequency measurement
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MDPI and ACS Style

Lurz, F.; Ostertag, T.; Scheiner, B.; Weigel, R.; Koelpin, A. Reader Architectures for Wireless Surface Acoustic Wave Sensors. Sensors 2018, 18, 1734.

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