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Simple modeling of LIBS plasma parameters for extraterrestrial applications

Hansen, Peder Bagge und Vogt, David und Schröder, Susanne und Rammelkamp, Kristin und Kubitza, Simon und Hübers, Heinz-Wilhelm (2019) Simple modeling of LIBS plasma parameters for extraterrestrial applications. European Winter Conference on Plasma Spectrochemistry, 2019-02-03 - 2019-02-08, Pau, France. (nicht veröffentlicht)

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Kurzfassung

LIBS has been proven very useful for in-situ geochemical analysis on the Martian surface [1]. It has also been proposed for future missions to explore other bodies of the Solar System [e.g. 2]. For this reason, it has become more important to understand the capabilities and challenges of LIBS under atmospheric conditions that are different from Earth. There is also a high interest in calibration-free LIBS (CF-LIBS) due to the highly versatile measuring conditions in planetary exploration. In this study, we have developed a method to assist the analysis of LIBS spectra acquired under different atmospheric conditions corresponding to different extraterrestrial mission scenarios. The method is developed from first principles and without resorting to measurements on calibration standards, similar to CF-LIBS [3]. Our approach follows from the same theory and assumptions as the standard approaches of CF-LIBS, such as the construction of Boltzmann plots, but many labor intensive steps are automated. Assuming an optically thin plasma in local thermal equilibrium (LTE) with assumed distributions of electron density and temperature, a linear relationship exists between the intensities of the atomic emission lines and the elemental concentrations. Our approach is to set up a system of linear equations between the extracted integrated peak intensities, in a given spectrum, and the theoretically predicted peak-intensities by the Saha-Boltzmann equation. From this system of equations, the concentrations are solved semi-analytically by minimizing the residuals between the peak-intensities. The minimization is repeated using different simply parameterized functions of the electron densities and temperatures, i.e. the plasma parameters. We evaluate the applicability of the method to data acquired under different atmospheric conditions. Moreover, we investigate the consequences of different assumptions and distributions of the electron density and temperature to the results and discuss the limitations of the approach. [1] Maurice et.al., Mars. J. Anal. At. Spectrom. (2016). [2] Arp et.al., Spectrochimica Acta Part B: Atomic Spectroscopy. (2004). [3] Tognoni et.al., Spectrochimica Acta Part B: Atomic Spectroscopy. (2009).

elib-URL des Eintrags:https://elib.dlr.de/128435/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Simple modeling of LIBS plasma parameters for extraterrestrial applications
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Hansen, Peder BaggePederBagge.Hansen (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Vogt, DavidDavid.Vogt (at) dlr.dehttps://orcid.org/0000-0003-1109-6960NICHT SPEZIFIZIERT
Schröder, SusanneSusanne.Schroeder (at) dlr.dehttps://orcid.org/0000-0003-1870-3663NICHT SPEZIFIZIERT
Rammelkamp, KristinKristin.Rammelkamp (at) dlr.dehttps://orcid.org/0000-0003-4808-0823NICHT SPEZIFIZIERT
Kubitza, SimonSimon.Kubitza (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Hübers, Heinz-WilhelmHeinz-Wilhelm.Huebers (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:6 Februar 2019
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:nicht veröffentlicht
Stichwörter:LIBS, Laser-induced breakdown spectroscopy, Extraterrestrial applications, CF-LIBS
Veranstaltungstitel:European Winter Conference on Plasma Spectrochemistry
Veranstaltungsort:Pau, France
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:3 Februar 2019
Veranstaltungsende:8 Februar 2019
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Erforschung des Weltraums
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R EW - Erforschung des Weltraums
DLR - Teilgebiet (Projekt, Vorhaben):R - Exploration des Sonnensystems
Standort: Berlin-Adlershof
Institute & Einrichtungen:Institut für Optische Sensorsysteme > Terahertz- und Laserspektroskopie
Hinterlegt von: Hansen, Peder Bagge
Hinterlegt am:05 Aug 2019 13:29
Letzte Änderung:24 Apr 2024 20:32

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