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Publisher DOI: 10.3390/s21072367
Title: Miniaturized hybrid frequency reader for contactless measurement scenarios using resonant surface acoustic wave sensors
Language: English
Authors: Scheiner, Benedict 
Probst, Florian 
Michler, Fabian 
Weigel, Robert 
Kölpin, Alexander  
Lurz, Fabian 
Keywords: frequency measurement system;SAWsensor;wireless sensors;torque;radio frequency sensors;MEMS sensor
Issue Date: 29-Mar-2021
Publisher: Multidisciplinary Digital Publishing Institute
Source: Sensors 21 (7): 2367 (2021-03-29)
Journal: Sensors 
Abstract (english): 
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.
DOI: 10.15480/882.3420
ISSN: 1424-8220
Other Identifiers: doi: 10.3390/s21072367
Institute: Hochfrequenztechnik E-3 
Document Type: Article
License: CC BY 4.0 (Attribution) CC BY 4.0 (Attribution)
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