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THERMAP: a mid-infrared spectro-imager based on an uncooled micro-bolometer for space missions to small bodies of the solar system

Brageot, E. and Groussin, O. and Lamy, J. and Reynaud, J.-L. and Fargant, G. and Licandro, J. and Helbert, J. and Knollenberg, J. and Kührt, E. (2012) THERMAP: a mid-infrared spectro-imager based on an uncooled micro-bolometer for space missions to small bodies of the solar system. Space Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave, 1-6 Jul 2012, Amsterdam, Netherlands.

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Official URL: http://dx.doi.org/10.1117/12.924345

Abstract

We report on the feasibility study of a mid-infrared (8-18 µm) spectro-imager called THERMAP, based on an uncooled micro-bolometer detector array. Due to the recent technological development of these detectors, which have undergone significant improvements in the last decade, we wanted to test their performances for the Marco Polo R ESA Cosmic Vision mission. In this study, we demonstrate that the new generation of uncooled micro-bolometer detectors has all the imaging and spectroscopic capabilities to fulfill the scientific objectives of this mission. In order to test the imaging capabilities of the detector, we set up an experiment based on a 640x480 ULIS micro-bolometer array, a germanium objective and a black body. Using the results of this experiment, we show that calibrated radiometric images can be obtained down to at least 255 K (lower limit of our experiment), and that two calibration points are sufficient to determine the absolute scene temperature with an accuracy better than 1.5 K. Adding flux attenuating neutral density mid-infrared filters (transmittance: 50%, 10%, 1%) to our experiment, we were able to evaluate the spectroscopic performances of the detector. Our results show that we can perform spectroscopic measurements in the wavelength range 8-16 µm with a spectral resolution of R~40-80 for a scene temperature <300 K, the typical surface temperature of a Near Earth Asteroid at 1 AU from the Sun. The mid-infrared spectro-imager THERMAP, based on the above detector, is therefore well suited for the Marco Polo R mission.

Item URL in elib:https://elib.dlr.de/80258/
Document Type:Conference or Workshop Item (Paper)
Title:THERMAP: a mid-infrared spectro-imager based on an uncooled micro-bolometer for space missions to small bodies of the solar system
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Brageot, E.Lab. d'Astrophysique de Marseille, CNRS, Univ. d'Aix-Marseille (France)UNSPECIFIED
Groussin, O.Lab. d'Astrophysique de Marseille, CNRS, Univ. d'Aix-Marseille (France))UNSPECIFIED
Lamy, J.Lab. d'Astrophysique de Marseille, CNRS, Univ. d'Aix-Marseille (France))UNSPECIFIED
Reynaud, J.-L.Lab. d'Astrophysique de Marseille, CNRS, Univ. d'Aix-Marseille (France))UNSPECIFIED
Fargant, G.Thales Alenia Space (France)UNSPECIFIED
Licandro, J.Instituto de Astrofísica de Canarias (Spain)UNSPECIFIED
Helbert, J.joern.helbert (at) dlr.deUNSPECIFIED
Knollenberg, J.joerg.knollenberg (at) dlr.deUNSPECIFIED
Kührt, E.ekkehard.kuehrt (at) dlr.deUNSPECIFIED
Date:September 2012
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:8442
Series Name:Proceedings of the SPIE
Status:Published
Keywords:infrared asteroids small bodies
Event Title:Space Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave
Event Location:Amsterdam, Netherlands
Event Type:international Conference
Event Dates:1-6 Jul 2012
Organizer:SPIE
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 Asteroiden und Kometen (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Experimentelle Planetenphysik
Deposited By: Helbert, Dr.rer.nat. Jörn
Deposited On:08 Jan 2013 10:22
Last Modified:08 Jan 2013 10:22

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