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Article

Miniaturized Hybrid Frequency Reader for Contactless Measurement Scenarios Using Resonant Surface Acoustic Wave Sensors

1
Insititute for Electronics Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Cauerstr. 9, 91058 Erlangen, Germany
2
Institute of High-Frequency Technology, Hamburg University of Technology, Denickestr. 22, 21073 Hamburg, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Mehmet Rasit Yuce
Sensors 2021, 21(7), 2367; https://doi.org/10.3390/s21072367
Received: 3 March 2021 / Revised: 24 March 2021 / Accepted: 25 March 2021 / Published: 29 March 2021
(This article belongs to the Special Issue Sensors: 20th Anniversary)
Due to higher automation and predictive maintenance, it becomes more and more important to acquire as many data as possible during industrial processes. However, many scenarios require remote sensing since either moving parts would result in wear and tear of cables or harsh environments prevent a wired connection. In the last few years, resonant surface acoustic wave (SAW) sensors have promised the possibility to be interrogable wirelessly which showed very good results in first studies. Therefore, the sensor’s resonance frequency shifts due to a changed measurand and thus has to be determined. However, up to now frequency reader systems showed several drawbacks like high costs or insufficient accuracy that blocked the way for a widespread usage of this approach in the mass market. Hence, this article presents a miniaturized and low cost six-port based frequency reader for SAW resonators in the 2.45 GHz ISM band that does not require an external calculation unit. It is shown that it can be either used to evaluate the scenario or measure the frequency directly with an amplitude or phase measurement, respectively. The performance of the system, including the hardware and embedded software, is finally shown by wired and contactless torque measurements. View Full-Text
Keywords: frequency measurement system; SAW sensor; wireless sensors; torque; radio frequency sensors; MEMS sensor frequency measurement system; SAW sensor; wireless sensors; torque; radio frequency sensors; MEMS sensor
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MDPI and ACS Style

Scheiner, B.; Probst, F.; Michler, F.; Weigel, R.; Koelpin, A.; Lurz, F. Miniaturized Hybrid Frequency Reader for Contactless Measurement Scenarios Using Resonant Surface Acoustic Wave Sensors. Sensors 2021, 21, 2367. https://doi.org/10.3390/s21072367

AMA Style

Scheiner B, Probst F, Michler F, Weigel R, Koelpin A, Lurz F. Miniaturized Hybrid Frequency Reader for Contactless Measurement Scenarios Using Resonant Surface Acoustic Wave Sensors. Sensors. 2021; 21(7):2367. https://doi.org/10.3390/s21072367

Chicago/Turabian Style

Scheiner, Benedict, Florian Probst, Fabian Michler, Robert Weigel, Alexander Koelpin, and Fabian Lurz. 2021. "Miniaturized Hybrid Frequency Reader for Contactless Measurement Scenarios Using Resonant Surface Acoustic Wave Sensors" Sensors 21, no. 7: 2367. https://doi.org/10.3390/s21072367

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