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Thermal Infrared Emissivity Spectra of Mercury Analogues at PEL in Support for MERTIS on BepiColombo

Maturilli, Alessandro and Helbert, Jörn and Ferrari, Sabrina and D'Amore, Mario (2015) Thermal Infrared Emissivity Spectra of Mercury Analogues at PEL in Support for MERTIS on BepiColombo. AOGS 2015, 2-7 Aug 2015, Singapore.

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Abstract

At the Planetary Emissivity Laboratory (PEL, Institute of Planetary Research of the German Aerospace Center, Berlin) we routinely measure emissivity spectra of planetary analogues, in the spectral range from 1 to 100 µm. Complementary measurements include reflectance and transmittance, from the visible to the far-infrared. The MERTIS instrument on the ESA-JAXA BepiColombo mission will collect for the first time thermal infrared (TIR) spectra (7-14 µm) from the hot surface of the innermost planet, which at noon can locally reach a temperature of 450 °C. To prepare for the interpretation of this new dataset, we built a facility to measure the emissivity of very hot surfaces under vacuum (< 0.8 mbar). A Bruker Vertex 80V evacuable spectrometer is connected to an external chamber where the samples are heated under vacuum to temperatures from 50° to above 800° C. The use of an induction heating system to heat-up the stainless steel cups minimizes heat loss to the chamber. As a standard, we measure 4 grain size ranges, from very fines (<25 µm) to larger grain size (125-250 µm), and when possible even larger grain sizes or slabs. A sample carousel mounted on a high-precision rotating motor allows measuring several samples a day without breaking the vacuum. A monitoring webcam and a large number of temperature sensors (on samples, cups or other hardware parts in the chamber) complete the set-up. Ongoing laboratory work shows that the high surface temperature of Mercury analogues can significantly affect the spectral characteristics of surface materials. This can lead to misinterpretations when compared to room temperature measurements. The effects have to be taken into account when interpreting spacecraft data, but even more so when designing new instrumentation.

Item URL in elib:https://elib.dlr.de/101768/
Document Type:Conference or Workshop Item (Poster)
Title:Thermal Infrared Emissivity Spectra of Mercury Analogues at PEL in Support for MERTIS on BepiColombo
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Maturilli, AlessandroAlessandro.Maturilli (at) dlr.deUNSPECIFIED
Helbert, JörnJoern.Helbert (at) dlr.dehttps://orcid.org/0000-0001-5346-9505
Ferrari, Sabrinasabrina.ferrari (at) dlr.deUNSPECIFIED
D'Amore, MarioMario.DAmore (at) dlr.dehttps://orcid.org/0000-0001-9325-6889
Date:August 2015
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:PEL, emissivity, MERTIS
Event Title:AOGS 2015
Event Location:Singapore
Event Type:international Conference
Event Dates:2-7 Aug 2015
Organizer:AOGS
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 BepiColombo (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Experimentelle Planetenphysik
Deposited By: Maturilli, Alessandro
Deposited On:06 Jan 2016 15:29
Last Modified:01 Dec 2018 19:51

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