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Wireless Readout of Multiple SAW Temperature Sensors

It has since long been known that surface acoustic wave (SAW) devices, resonators as well as delay lines, can be used as passive wireless sensors for physical quantities, like temperature and pressure, as well as gas sensors or identification-tags (ID-tags). The sensors are robust, work passively wi...

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Detalles Bibliográficos
Autores principales: Bruckner, Gudrun, Bardong, Jochen
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6679283/
https://www.ncbi.nlm.nih.gov/pubmed/31336854
http://dx.doi.org/10.3390/s19143077
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author Bruckner, Gudrun
Bardong, Jochen
author_facet Bruckner, Gudrun
Bardong, Jochen
author_sort Bruckner, Gudrun
collection PubMed
description It has since long been known that surface acoustic wave (SAW) devices, resonators as well as delay lines, can be used as passive wireless sensors for physical quantities, like temperature and pressure, as well as gas sensors or identification-tags (ID-tags). The sensors are robust, work passively without a battery, can be applied at high temperatures, and provide a high resolution. Nevertheless, if the devices are used wirelessly in an industrial environment, several constraints have to be taken into account, especially when more than one quantity or device needs to be measured at the same time. The paper addresses the challenges that must be tackled when establishing multi-sensor-wireless-readout for industrial applications. Major issues here are the legal regulations for industrial, scientific and medical frequency bands (ISM-bands), as well as sampling time and costs, which impose severe restrictions to any system design. We describe several design approaches and their constraints. We successfully designed sensors based on reflective delay lines that allow the parallel readout of four independent temperature sensors in the 2.45 GHz ISM-band. These devices were fabricated and positively tested, demonstrating the applicability of SAW sensors for industrial applications.
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spelling pubmed-66792832019-08-19 Wireless Readout of Multiple SAW Temperature Sensors Bruckner, Gudrun Bardong, Jochen Sensors (Basel) Article It has since long been known that surface acoustic wave (SAW) devices, resonators as well as delay lines, can be used as passive wireless sensors for physical quantities, like temperature and pressure, as well as gas sensors or identification-tags (ID-tags). The sensors are robust, work passively without a battery, can be applied at high temperatures, and provide a high resolution. Nevertheless, if the devices are used wirelessly in an industrial environment, several constraints have to be taken into account, especially when more than one quantity or device needs to be measured at the same time. The paper addresses the challenges that must be tackled when establishing multi-sensor-wireless-readout for industrial applications. Major issues here are the legal regulations for industrial, scientific and medical frequency bands (ISM-bands), as well as sampling time and costs, which impose severe restrictions to any system design. We describe several design approaches and their constraints. We successfully designed sensors based on reflective delay lines that allow the parallel readout of four independent temperature sensors in the 2.45 GHz ISM-band. These devices were fabricated and positively tested, demonstrating the applicability of SAW sensors for industrial applications. MDPI 2019-07-12 /pmc/articles/PMC6679283/ /pubmed/31336854 http://dx.doi.org/10.3390/s19143077 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Bruckner, Gudrun
Bardong, Jochen
Wireless Readout of Multiple SAW Temperature Sensors
title Wireless Readout of Multiple SAW Temperature Sensors
title_full Wireless Readout of Multiple SAW Temperature Sensors
title_fullStr Wireless Readout of Multiple SAW Temperature Sensors
title_full_unstemmed Wireless Readout of Multiple SAW Temperature Sensors
title_short Wireless Readout of Multiple SAW Temperature Sensors
title_sort wireless readout of multiple saw temperature sensors
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6679283/
https://www.ncbi.nlm.nih.gov/pubmed/31336854
http://dx.doi.org/10.3390/s19143077
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