Actions for Application of distance correction to ChemCam laser-induced breakdown spectroscopy measurements [electronic resource].

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Application of distance correction to ChemCam laser-induced breakdown spectroscopy measurements [electronic resource].

Published
Washington, D.C. : National Aeronautics and Space Administration Announcement, 2016.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description
pages 19-29 : digital, PDF file
Additional Creators
Los Alamos National Laboratory, National Aeronautics and Space Administration Announcement, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Laser-induced breakdown spectroscopy (LIBS) provides chemical information from atomic, ionic, and molecular emissions from which geochemical composition can be deciphered. Analysis of LIBS spectra in cases where targets are observed at different distances, as is the case for the ChemCam instrument on the Mars rover Curiosity, which performs analyses at distances between 2 and 7.4 m is not a simple task. Previously, we showed that spectral distance correction based on a proxy spectroscopic standard created from first-shot dust observations on Mars targets ameliorates the distance bias in multivariate-based elemental-composition predictions of laboratory data. In this work, we correct an expanded set of neutral and ionic spectral emissions for distance bias in the ChemCam data set. By using and testing different selection criteria to generate multiple proxy standards, we find a correction that minimizes the difference in spectral intensity measured at two different distances and increases spectral reproducibility. When the quantitative performance of distance correction is assessed, there is improvement for SiO2, Al2O3, CaO, FeOT, Na2O, K2O, that is, for most of the major rock forming elements, and for the total major-element weight percent predicted. But, for MgO the method does not provide improvements while for TiO2, it yields inconsistent results. Additionally, we observed that many emission lines do not behave consistently with distance, evidenced from laboratory analogue measurements and ChemCam data. This limits the effectiveness of the method.
Report Numbers
E 1.99:la-ur--17-26884
la-ur--17-26884
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Note
Published through SciTech Connect.
04/04/2016.
"la-ur--17-26884"
Spectrochimica Acta. Part B, Atomic Spectroscopy 120 C ISSN 0584-8547 AM
A. Mezzacappa; N. Melikechi; A. Cousin; R. C. Wiens; J. Lasue; S. M. Clegg; R. Tokar; S. Bender; N. L. Lanza; S. Maurice; G. Berger; O. Forni; O. Gasnault; M. D. Dyar; T. Boucher; E. Lewin; C. Fabre.
Funding Information
AC52-06NA25396
NNX10AN63H
NNX09AU90A
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