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Humidity calibration of relative humidity devices in Martian conditions

Hieta, Maria and Genzer, Maria and Polkko, Jouni and Jaakonaho, Iina and Lorek, Andreas and Garland, Stephen and de Vera, J. P. and Martinez, German and Fischer, Erik (2020) Humidity calibration of relative humidity devices in Martian conditions. EGU General Assembly 2020, Wien, Österreich. doi: 10.5194/egusphere-egu2020-18057.

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Finnish Meteorological Institute (FMI) has developed relative humidity measurement devices for past and future Mars lander missions: REMS-H for Curiosity, MEDA HS for Mars 2020 and METEO-H for ExoMars 2020. The sensors used in these devices are HUMICAP® capacitive thin-film polymer sensors by Vaisala Inc. New calibration measurements are performed with ground reference models of these devices in the Mars Simulation Facility (MSF) and Planetary Analog Simulation Laboratory (PASLAB) at the German Aerospace Center (DLR) in spring 2020. The preliminary results will be given at the EGU 2020. Calibration of relative humidity devices requires in minimum two humidity points over the expected operational temperature and pressure range of the device. With two-point calibration the relative humidity devices can be used for scientific measurements with satisfactory quality but the uncertainty is notable. Stable humidity conditions between dry and saturation humidity in Martian conditions can be achieved reliably in very few laboratories in the whole world and humidity measurements in Martian conditions have been previously performed for the same devices in FMI laboratory and in Michigan Mars Environmental Chamber (MMEC) at the University of Michigan. The new measurement campaign will consist of stable humidity point measurements in multiple temperatures between +10°C to -70°C in CO2 gas and Martian pressure of approximately 7 hPa. The measurements are performed simultaneously for multiple devices in a small pressure vessel with continuous humidified carbon dioxide flow. The new measurement campaign will improve the characterization of the existing relative humidity devices in Mars lander missions and define in more detail the measurement uncertainties.

Item URL in elib:https://elib.dlr.de/138851/
Document Type:Conference or Workshop Item (Poster)
Title:Humidity calibration of relative humidity devices in Martian conditions
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Hieta, MariaFinnish Meteorological Institute (FMI), Helsinki, FinlandUNSPECIFIED
Genzer, MariaFinnish Meteorological Institute (FMI), Helsinki, FinlandUNSPECIFIED
Polkko, JouniFinnish Meteorological Institute (FMI), Helsinki, FinlandUNSPECIFIED
Jaakonaho, IinaFinnish Meteorological Institute (FMI), Helsinki, FinlandUNSPECIFIED
Lorek, AndreasAndreas.Lorek (at) dlr.dehttps://orcid.org/0000-0002-8960-6214
Garland, Stephenstephen.garland (at) dlr.deUNSPECIFIED
de Vera, J. P.jean-pierre.devera (at) dlr.dehttps://orcid.org/0000-0002-9530-5821
Martinez, GermanLunar and Planetary Institute/USRA, Houston, TX, USAUNSPECIFIED
Fischer, ErikUniversity of Michigan, Ann Arbor, USAUNSPECIFIED
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
DOI :10.5194/egusphere-egu2020-18057
Keywords:relative humidity; Mars conditions; Mars simulation chamber; calibration
Event Title:EGU General Assembly 2020
Event Location:Wien, Österreich
Event Type:international Conference
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Vorhaben Planetary Evolution and Life (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Laboratories
Deposited By: de Vera, Dr. Jean Pierre Paul
Deposited On:03 Dec 2020 11:29
Last Modified:03 Dec 2020 11:29

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