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Capacitive Sensing of Icing under Vacuum and Cryogenic Temperatures

In certain industrial processes, ice aggregations on surfaces can occur under almost vacuum conditions and at very low to cryogenic temperatures due to residual water molecules. This aggregation can affect the performance of the process and it is therefore of interest to monitor such surfaces. In th...

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Autores principales: Padilha Leitzke, Juliana, Mitterer, Tobias, Zangl, Hubert
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6719181/
https://www.ncbi.nlm.nih.gov/pubmed/31426374
http://dx.doi.org/10.3390/s19163574
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author Padilha Leitzke, Juliana
Mitterer, Tobias
Zangl, Hubert
author_facet Padilha Leitzke, Juliana
Mitterer, Tobias
Zangl, Hubert
author_sort Padilha Leitzke, Juliana
collection PubMed
description In certain industrial processes, ice aggregations on surfaces can occur under almost vacuum conditions and at very low to cryogenic temperatures due to residual water molecules. This aggregation can affect the performance of the process and it is therefore of interest to monitor such surfaces. In this paper, we present a capacitive ice measurement system capable to operate in vacuum and temperatures of about [Formula: see text] [Formula: see text] and below. We present a capacitive sensor setup with a separation of sensor element and sensor electronics, such that the sensor electronics can reside outside the cold environment. It is demonstrated that the permittivity of such ice formations at vacuum and low temperatures is sufficient for measurement using the proposed sensor configuration. Results from a long-term study using a prototype further demonstrate the stability of the system and thus the feasibility of the proposed system for long term condition monitoring of surfaces in vacuum that are e.g., cooled by cryogenic liquids. The developed system uses wireless communication in order to allow for simple retrofitting of existing infrastructure even in remote locations.
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spelling pubmed-67191812019-09-10 Capacitive Sensing of Icing under Vacuum and Cryogenic Temperatures Padilha Leitzke, Juliana Mitterer, Tobias Zangl, Hubert Sensors (Basel) Article In certain industrial processes, ice aggregations on surfaces can occur under almost vacuum conditions and at very low to cryogenic temperatures due to residual water molecules. This aggregation can affect the performance of the process and it is therefore of interest to monitor such surfaces. In this paper, we present a capacitive ice measurement system capable to operate in vacuum and temperatures of about [Formula: see text] [Formula: see text] and below. We present a capacitive sensor setup with a separation of sensor element and sensor electronics, such that the sensor electronics can reside outside the cold environment. It is demonstrated that the permittivity of such ice formations at vacuum and low temperatures is sufficient for measurement using the proposed sensor configuration. Results from a long-term study using a prototype further demonstrate the stability of the system and thus the feasibility of the proposed system for long term condition monitoring of surfaces in vacuum that are e.g., cooled by cryogenic liquids. The developed system uses wireless communication in order to allow for simple retrofitting of existing infrastructure even in remote locations. MDPI 2019-08-16 /pmc/articles/PMC6719181/ /pubmed/31426374 http://dx.doi.org/10.3390/s19163574 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
Padilha Leitzke, Juliana
Mitterer, Tobias
Zangl, Hubert
Capacitive Sensing of Icing under Vacuum and Cryogenic Temperatures
title Capacitive Sensing of Icing under Vacuum and Cryogenic Temperatures
title_full Capacitive Sensing of Icing under Vacuum and Cryogenic Temperatures
title_fullStr Capacitive Sensing of Icing under Vacuum and Cryogenic Temperatures
title_full_unstemmed Capacitive Sensing of Icing under Vacuum and Cryogenic Temperatures
title_short Capacitive Sensing of Icing under Vacuum and Cryogenic Temperatures
title_sort capacitive sensing of icing under vacuum and cryogenic temperatures
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6719181/
https://www.ncbi.nlm.nih.gov/pubmed/31426374
http://dx.doi.org/10.3390/s19163574
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