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Humidity measurement with capacitive humidity sensors between −70°C and 25°C in low vacuum

Lorek, Andreas (2014) Humidity measurement with capacitive humidity sensors between −70°C and 25°C in low vacuum. Journal of Sensors and Sensor Systems, 3 (2), pp. 177-185. Copernicus Publications. DOI: 10.5194/jsss-3-177-2014 ISSN 2194-8771

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Official URL: http://www.j-sens-sens-syst.net/3/177/2014/


At the German Aerospace Center (DLR), capacitive humidity sensors are used to measure relative humidity in experiments under extreme atmospheric conditions such as on Mars or in the coldest regions on Earth. This raises the question whether such experiments can be performed using low-cost humidity sensors with a tolerable measurement uncertainty. As part of the standardizing project SMADLUSEA (project no. SF11021A), nine capacitive humidity sensors (Sensirion SHT75) were investigated for pressure ranging from 10 to 1000 hPa (low vacuum) and temperatures from −70 to 25 �C. It has been shown that these sensors worked reliably and with reproducibly measured values over the entire investigated pressure and temperature range. There was no aging of the sensors observable. In addition to the known strong temperature dependency, the SHT75 also shows a pressure dependency below −10 �C. A characteristic curve for the SHT75 was calculated with an expanded uncertainty of 7% of the measured values. In conclusion, low-cost capacitive humidity sensors offer the option to obtain reliably measured values even under extreme conditions with comparatively little effort.

Item URL in elib:https://elib.dlr.de/90471/
Document Type:Article
Additional Information:gefördert durch das BMWi im TNS-Projekt SMADLUSEA (project no. SF11021A)
Title:Humidity measurement with capacitive humidity sensors between −70°C and 25°C in low vacuum
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Lorek, Andreasandreas.lorek (at) dlr.deUNSPECIFIED
Date:29 August 2014
Journal or Publication Title:Journal of Sensors and Sensor Systems
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
DOI :10.5194/jsss-3-177-2014
Page Range:pp. 177-185
Publisher:Copernicus Publications
Keywords:humidity, vaccum, SHT75, capacitive humidity sensor, low temperature, martian condition, humidity measurement
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Vorhaben Exploration des Sonnensystems
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Experimentelle Planetenphysik
Deposited By: Lorek, Dr.rer.nat. Andreas
Deposited On:06 Oct 2014 08:57
Last Modified:14 Dec 2019 04:22

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