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Correcting for variable laser-target distances of laser-induced breakdown spectroscopy measurements with ChemCam using emission lines of Martian dust spectra

Melikechi, N. and Mezzacappa, A. and Cousin, A. and Lanza, N. L. and Lasue, J. and Clegg, S. M. and Berger, G. and Wiens, R. C. and Maurice, S. and Tokar, R. L. and Bender, S. and Forni, O. and Breves, E. A. and Dyar, M. D. and Frydenvang, J. and Delapp, D. and Gasnault, O. and Newsom, H. and Ollila, A. M. and Lewin, E. and Clark, B. C. and Ehlmann, B. L. and Blaney, D. and Fabre, C. (2014) Correcting for variable laser-target distances of laser-induced breakdown spectroscopy measurements with ChemCam using emission lines of Martian dust spectra. Spectrochimica Acta Part B: Atomic Spectroscopy, 96 . pp. 51-60. ISSN 0584-8547. https://resolver.caltech.edu/CaltechAUTHORS:20141219-105727188

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Abstract

As part of the Mars Science Laboratory, the ChemCam instrument acquires remote laser induced breakdown spectra at distances that vary between 1.56 m and 7 m. This variation in distance affects the intensities of the measured LIBS emission lines in non-trivial ways. To determine the behavior of a LIBS emission line with distance, it is necessary to separate the effects of many parameters such as laser energy, laser spot size, target homogeneity, and optical collection efficiency. These parameters may be controlled in a laboratory on Earth but for field applications or in space this is a challenge. In this paper, we show that carefully selected ChemCam LIBS emission lines acquired from the Martian dust can be used to build an internal proxy spectroscopic standard. This in turn, allows for a direct measurement of the effects of the distance of various LIBS emission lines and hence can be used to correct ChemCam LIBS spectra for distance variations. When tested on pre-launch LIBS calibration data acquired under Martian-like conditions and with controlled and well-calibrated targets, this approach yields much improved agreement between targets observed at various distances. This work lays the foundation for future implementation of automated routines to correct ChemCam spectra for differences caused by variable distance.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/j.sab.2014.04.004 DOIArticle
http://www.sciencedirect.com/science/article/pii/S0584854714000470PublisherArticle
ORCID:
AuthorORCID
Lanza, N. L.0000-0003-4445-7996
Clegg, S. M.0000-0002-0338-0948
Wiens, R. C.0000-0002-3409-7344
Frydenvang, J.0000-0001-9294-1227
Delapp, D.0000-0002-2514-337X
Clark, B. C.0000-0002-5546-8757
Ehlmann, B. L.0000-0002-2745-3240
Additional Information:© 2014 Elsevier B.V. Received 18 October 2013; Accepted 7 April 2014; Available online 22 April 2014. Selected paper from the 7th Euro-Mediterranean Symposium on Laser Induced Breakdown Spectroscopy (EMSLIBS 2013), Bari, Italy, 16–20 September 2013.
Subject Keywords:LIBS; Mars; Dust; Remote sensing; Geological analysis
Record Number:CaltechAUTHORS:20141219-105727188
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20141219-105727188
Official Citation:N. Melikechi, A. Mezzacappa, A. Cousin, N.L. Lanza, J. Lasue, S.M. Clegg, G. Berger, R.C. Wiens, S. Maurice, R.L. Tokar, S. Bender, O. Forni, E.A. Breves, M.D. Dyar, J. Frydenvang, D. Delapp, O. Gasnault, H. Newsom, A.M. Ollila, E. Lewin, B.C. Clark, B.L. Ehlmann, D. Blaney, C. Fabre, Correcting for variable laser-target distances of laser-induced breakdown spectroscopy measurements with ChemCam using emission lines of Martian dust spectra, Spectrochimica Acta Part B: Atomic Spectroscopy, Volume 96, 1 June 2014, Pages 51-60, ISSN 0584-8547, http://dx.doi.org/10.1016/j.sab.2014.04.004. (http://www.sciencedirect.com/science/article/pii/S0584854714000470)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:53038
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:19 Dec 2014 20:32
Last Modified:03 Oct 2019 07:46

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