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Modeling of LIBS Spectra Obtained in Martian Atmospheric Conditions

Hansen, Peder Hansen (2022) Modeling of LIBS Spectra Obtained in Martian Atmospheric Conditions. Dissertation, Humboldt Universität zu Berlin. doi: 10.18452/25303.

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Official URL: https://edoc.hu-berlin.de/handle/18452/21613


Motivated by existing challenges in analysing LIBS spectra and the increasing quantity of Martian LIBS data, this thesis investigates the modelling and simulation of LIBS spectra for the application to LIBS data in Martian atmospheric conditions. This is done with the aim of providing insights into the characteristics of Martian LIBS plasmas as well as developing tools to assist the analysis of real mission data. The modelling of LIBS spectra is based on a stationary plasma in local thermal equilibrium (LTE). The plasma is then divided into a series of homogeneous zones and spectra are simulated using radiative transfer along a one-dimensional line-of-sight through the plasma zones. The results of this thesis show that spectral modelling based on LTE can be well applied to LIBS data in Martian atmospheric conditions. For time-resolved data, fits of a two-zone plasma model can be used to obtain insights into the plasma as well as improved concentration estimates compared to the Saha-Boltzmann plot method. However, attention to non-equilibrium effects should be given at the earliest and latest stages of the plasma lifetime. For time-integrated spectra, i.e. real mission data, fits of the two-zone model are not feasible due to too long computation times. Instead, a superposition of spectra of different temperatures and densities, i.e. the spectral unmixing method, can be used. Although not directly allowing for quantitative concentration estimates, the method is a great tool to overview the large amount of information contained in the spectra.

Item URL in elib:https://elib.dlr.de/193447/
Document Type:Thesis (Dissertation)
Title:Modeling of LIBS Spectra Obtained in Martian Atmospheric Conditions
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Hansen, Peder HansenUNSPECIFIEDhttps://orcid.org/0000-0002-5179-8265UNSPECIFIED
Refereed publication:Yes
Open Access:Yes
Number of Pages:185
Keywords:LIBS, laser-induced breakdown spectroscopy, Mars, Martian atmospheric conditions, atomic emission spectroscopy, plasma, radiative transfer, local thermodynamic equilibrium
Institution:Humboldt Universität zu Berlin
Department:Mathematisch-Naturwissenschaftliche Fakultät
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Robotics
DLR - Research area:Raumfahrt
DLR - Program:R RO - Robotics
DLR - Research theme (Project):R - OptoRob [RO]
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Optical Sensor Systems > Terahertz and Laser Spectroscopy
Deposited By: Hansen, Peder
Deposited On:20 Jan 2023 10:52
Last Modified:20 Jan 2023 10:52

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