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Experimental Verification of Validity for Kirchhoff's Law (E=1-R) in Vacuum and Purged Air

Maturilli, Alessandro and Helbert, Jörn and D'Amore, Mario and Ferrari, Sabrina (2015) Experimental Verification of Validity for Kirchhoff's Law (E=1-R) in Vacuum and Purged Air. In: Lunar and Planetary Science. LPSC 2015, March 16-20, 2015, The Woodlands, Texas, USA.

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Abstract

The simplest postulation (without wavelength or directional subscripts) for Kirchhoff’s law reads Ɛ=1-R, where Ɛ is emissivity and R is reflectance. However, Kirchhoff’s law was originally postulated for opaque materials in thermodynamic equilibrium with the surrounding medium (meaning the sample is isothermal and at the same temperature of the background to wich it radiates) [1]. Such a condition is rarely found in laboratory on Earth and never met in space; nevertheless, for simplification or lacking of suitable emissivity datasets (and being reflectance measurements much easier than emissivity measurements), Kirchhoff’s law is widely used to substitute emissivity with 1 minus reflectance measurements (and often bi-conical or bi-directional reflectance is used, and not hemispherical as it should be). The purpose of this paper is to show the behavior of emissivity vs. bi-directional reflectance measurements for samples of small to large grain sizes, under vacuum or purged air, at various sample temperatures.

Item URL in elib:https://elib.dlr.de/101702/
Document Type:Conference or Workshop Item (Poster)
Title:Experimental Verification of Validity for Kirchhoff's Law (E=1-R) in Vacuum and Purged Air
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
D'Amore, MarioMario.DAmore (at) dlr.dehttps://orcid.org/0000-0001-9325-6889
Ferrari, Sabrinasabrina.ferrari (at) dlr.deUNSPECIFIED
Date:March 2015
Journal or Publication Title:Lunar and Planetary Science
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Emissivity, Kirchhoff's Law
Event Title:LPSC 2015
Event Location:The Woodlands, Texas, USA
Event Type:international Conference
Event Dates:March 16-20, 2015
Organizer:LPI
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 13:58
Last Modified:31 Jul 2019 19:59

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