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Time-resolved spectral imaging of LIBS plasma at low pressures for the exploration of Solar System bodies

Vogt, David and Hansen, Peder Bagge and Rammelkamp, Kristin and Kubitza, Simon and Frohmann, Sven and Schröder, Susanne and Hübers, Heinz-Wilhelm (2018) Time-resolved spectral imaging of LIBS plasma at low pressures for the exploration of Solar System bodies. SciX 2018, 21.-26. Okt. 2018, Atlanta, USA.

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Abstract

LIBS is an increasingly important tool in the exploration of Solar System bodies. It has met great success on Mars with the ChemCam instrument on board of the NASA Mars Science Laboratory. SuperCam, the successor of the ChemCam instrument, will use LIBS in combination with Raman and fluorescence spectroscopy on the Mars2020 mission. The Chandrayaan-2 mission of India will feature a lunar rover with an on-board LIBS instrument. Additionally, concepts for LIBS instruments that could be used on other planetary bodies in the Solar System have been proposed. The reduced atmospheric pressure on many Solar System bodies has a strong influence on the LIBS plasma. At lower pressures, the plasma plume becomes more optically thin, resulting in less plasma shielding and more material ablation. At the same time, the lifetime and the emissivity of the plasma plume decrease as it expands more quickly. This tradeoff yields maximum signal intensities at around 10 mbar, close to Martian atmospheric pressure. Below 1 µbar, the pressure of the LIBS plasma is significantly larger than the atmospheric pressure and a stable low-intensity plateau is reached. Laboratory studies at this pressure should therefore be a good approximation of planetary bodies without an atmosphere. In this study, we investigate plasma plumes of geological samples at pressures between 1 µbar and 1 bar with a custom time-resolved plasma imaging setup. We compare spatial distributions of atomic, ionic and molecular species inside the expanding plasma plumes for different pressures and calculate profiles for the temperature and the electron density. The results will indicate which approximations and assumptions still hold in low-pressure conditions, which is important for the analysis of LIBS data from Mars and other planetary exploration missions.

Item URL in elib:https://elib.dlr.de/125522/
Document Type:Conference or Workshop Item (Poster)
Title:Time-resolved spectral imaging of LIBS plasma at low pressures for the exploration of Solar System bodies
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Vogt, DavidDavid.Vogt (at) dlr.deUNSPECIFIED
Hansen, Peder BaggePederBagge.Hansen (at) dlr.deUNSPECIFIED
Rammelkamp, KristinKristin.Rammelkamp (at) dlr.deUNSPECIFIED
Kubitza, SimonSimon.Kubitza (at) dlr.deUNSPECIFIED
Frohmann, SvenSven.Frohmann (at) dlr.deUNSPECIFIED
Schröder, SusanneSusanne.Schroeder (at) dlr.deUNSPECIFIED
Hübers, Heinz-WilhelmHeinz-Wilhelm.Huebers (at) dlr.deUNSPECIFIED
Date:25 October 2018
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Roboter Sonnensystem Laser Plasma Mars Spektroskopie
Event Title:SciX 2018
Event Location:Atlanta, USA
Event Type:international Conference
Event Dates:21.-26. Okt. 2018
Organizer:FACSS
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Technik für Raumfahrtsysteme
DLR - Research theme (Project):R - Vorhaben OptoRob, R - Vorhaben Exploration des Sonnensystems
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Optical Sensor Systems > Terahertz and Laser Spectroscopy
Deposited By: Vogt, David
Deposited On:08 Jan 2019 09:29
Last Modified:31 Jul 2019 20:23

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