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The Berlin emissivity database

Maturilli, A. and Helbert, J. and Moroz, L. (2008) The Berlin emissivity database. Planetary and Space Science, 56 (3-4), pp. 420-425. Elsevier. DOI: 10.1016/j.pss.2007.11.015.

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Abstract

Remote-sensing infrared spectroscopy is the principal field of investigation for planetary surfaces composition. Past, present and future missions to the solar system bodies include in their payload, instruments measuring the emerging radiation in the infrared range. Apart from measuring the reflected radiance, more and more spacecrafts are equipped with instruments measuring directly the emitted radiation from the planetary surface. The emitted radiation is not only a function of the composition of the material but also of its texture and especially the grain size distribution. For the interpretation of the measured data an emissivity spectral library of planetary analogue materials in grain size fractions appropriate for planetary surfaces is needed. The Berlin emissivity database (BED) presented here is focused on relatively fine-grained size separates, providing thereby a realistic basis for the interpretation of thermal emission spectra of planetary regoliths. The BED is therefore complimentary to existing thermal emission libraries, like the ASU library for example. BED currently contains emissivity spectra of plagioclase and potassium feldspars, low Ca and high Ca pyroxenes, olivine, elemental sulfur, Martian analogue minerals and volcanic soils, and a lunar highland soil sample measured in the wavelength range from 7 to 22 μm as a function of particle size. For each sample we measured the spectra of four particle size separates ranging from &lt;25 to 250 μm. The device we used is built at DLR (Berlin) and is coupled to a Fourier-transform infrared spectrometer Bruker IFS 88 purged with dry air and equipped with a nitrogen-cooled MCT detector. All spectra were acquired with a spectral resolution of 4 cm<sup>‑1</sup>. We are currently working on upgrading our emissivity facility. A new spectrometer (Bruker VERTEX 80 V) and new detectors will allow us to measure the emissivity of samples in the wavelength range from 1 to 50 μm in a vacuum environment. This will be particularly important for the interpretation of the MERcury Thermal Infrared Imaging Spectrometer (MERTIS) data.

Document Type:Article
Title:The Berlin emissivity database
Authors:
AuthorsInstitution or Email of Authors
Maturilli, A.UNSPECIFIED
Helbert, J.UNSPECIFIED
Moroz, L.UNSPECIFIED
Date:March 2008
Journal or Publication Title:Planetary and Space Science
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:56
DOI:10.1016/j.pss.2007.11.015
Page Range:pp. 420-425
Publisher:Elsevier
Status:Published
Keywords:IR-spectroscopy; Emittance; Analogue materials; Mars; Mercury
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - Vorhaben BepiColombo (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Physics
Deposited By: Stefanie Hempel
Deposited On:14 Oct 2008
Last Modified:27 Apr 2009 15:13

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