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Uncertainly Analysis of Two Types of Humidity Sensors by a Humidity Generator with a Divided-Flow System

Humidity measurement is an important technique for the agricultural, foods, pharmaceuticals, and chemical industries. For the sake of convenience, electrical relative humidity (RH) sensors have been widely used. These sensors need to be calibrated to ensure their accuracy and the uncertainty measure...

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Autores principales: Chen, Ling-Hsi, Chen, Chiachung
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5855354/
https://www.ncbi.nlm.nih.gov/pubmed/29466313
http://dx.doi.org/10.3390/s18020637
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author Chen, Ling-Hsi
Chen, Chiachung
author_facet Chen, Ling-Hsi
Chen, Chiachung
author_sort Chen, Ling-Hsi
collection PubMed
description Humidity measurement is an important technique for the agricultural, foods, pharmaceuticals, and chemical industries. For the sake of convenience, electrical relative humidity (RH) sensors have been widely used. These sensors need to be calibrated to ensure their accuracy and the uncertainty measurement of these sensors has become a major concern. In this study, a self-made divided-flow generator was established to calibrate two types of electrical humidity sensors. The standard reference humidity was calculated from dew-point temperature and air dry-bulb temperature measured by a chilled mirror monitor. This divided-flow generator could produce consistent result of RH measurement results. The uncertainty of the reference standard increased with the increase of RH values. The combined uncertainty with the adequate calibration equations were ranged from 0.82% to 1.45% RH for resistive humidity sensors and 0.63% to 1.4% for capacitive humidity sensors, respectively. This self-made, divided-flow generator, and calibration method are cheap, time-saving, and easy to be used. Thus, the proposed approach can easily be applied in research laboratories.
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spelling pubmed-58553542018-03-20 Uncertainly Analysis of Two Types of Humidity Sensors by a Humidity Generator with a Divided-Flow System Chen, Ling-Hsi Chen, Chiachung Sensors (Basel) Article Humidity measurement is an important technique for the agricultural, foods, pharmaceuticals, and chemical industries. For the sake of convenience, electrical relative humidity (RH) sensors have been widely used. These sensors need to be calibrated to ensure their accuracy and the uncertainty measurement of these sensors has become a major concern. In this study, a self-made divided-flow generator was established to calibrate two types of electrical humidity sensors. The standard reference humidity was calculated from dew-point temperature and air dry-bulb temperature measured by a chilled mirror monitor. This divided-flow generator could produce consistent result of RH measurement results. The uncertainty of the reference standard increased with the increase of RH values. The combined uncertainty with the adequate calibration equations were ranged from 0.82% to 1.45% RH for resistive humidity sensors and 0.63% to 1.4% for capacitive humidity sensors, respectively. This self-made, divided-flow generator, and calibration method are cheap, time-saving, and easy to be used. Thus, the proposed approach can easily be applied in research laboratories. MDPI 2018-02-21 /pmc/articles/PMC5855354/ /pubmed/29466313 http://dx.doi.org/10.3390/s18020637 Text en © 2018 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
Chen, Ling-Hsi
Chen, Chiachung
Uncertainly Analysis of Two Types of Humidity Sensors by a Humidity Generator with a Divided-Flow System
title Uncertainly Analysis of Two Types of Humidity Sensors by a Humidity Generator with a Divided-Flow System
title_full Uncertainly Analysis of Two Types of Humidity Sensors by a Humidity Generator with a Divided-Flow System
title_fullStr Uncertainly Analysis of Two Types of Humidity Sensors by a Humidity Generator with a Divided-Flow System
title_full_unstemmed Uncertainly Analysis of Two Types of Humidity Sensors by a Humidity Generator with a Divided-Flow System
title_short Uncertainly Analysis of Two Types of Humidity Sensors by a Humidity Generator with a Divided-Flow System
title_sort uncertainly analysis of two types of humidity sensors by a humidity generator with a divided-flow system
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5855354/
https://www.ncbi.nlm.nih.gov/pubmed/29466313
http://dx.doi.org/10.3390/s18020637
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