P027-0010
Perseverance’s SuperCam-Raman: a Quality Assurance of Analytical Spectral Variables
Wednesday, 9 December 2020
Poster
Imanol Torre Fernandez1, Julene Aramendia2, Cristina Garcia-Florentino1, Ann Ollila3, Patricia Ruiz-Galende1, Gorka Arana1, Sylvain Bernard4, Olivier Beyssac5, Kepa Castro1, Samuel M Clegg6, Agnes Cousin7, Miles Egan8, Olivier Forni9, Olivier Gasnault10, Guillermo Lopez-Reyes11, Juan Manuel Madariaga1, José Manrique12, Sylvestre Maurice7, Anupam K Misra13, Gilles Montagnac14, Tony Nelson6, Raymond T Newell6, Paolo Pilleri15, Scott Robinson6, Fernando Rull12, Shiv K Sharma16, Marco Veneranda17, Roger C Wiens18, Peter A Willis19 and SuperCam Science Team, (1)Universidad del País Vasco / Euskal Herriko Unibertsitatea, Leioa, Spain, (2)University of the Basque Country, Leioa, Spain, (3)University of New Mexico Main Campus, Los Lunas, NM, United States, (4)MNHN National Museum of Natural History Paris, IMPMC, Paris, France, (5)Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC), Sorbonne Université, CNRS, MNHN, Paris, France, (6)Los Alamos National Laboratory, Los Alamos, NM, United States, (7)Institut de Recherche en Astrophysique et Planétologie (IRAP), Toulouse, France, (8)University of Hawaii, Hawaii Institute of Geophysics and Planetology,, Honolulu, HI, United States, (9)IRAP-CNRS, Toulouse Cedex 4, France, (10)Universite de Toulouse, Toulouse Cedex 4, France, (11)Center of Astrobiology, Unidad Asociada UVa-CSIC-CAB, Valladolid, Spain, (12)Universidad de Valladolid, Valladolid, Spain, (13)University of Hawaii at Manoa, Hawaii Institute of Geophysics and Planetology, Honolulu, HI, United States, (14)Ecole Normale Supérieure Lyon, Lyon, France, (15)Research Institute in Astrophysics and Planetology, Toulouse, France, (16)Univ Hawaii, Honolulu, HI, United States, (17)University of Valladolid, Boecillo, Spain, (18)Space Science and Applications, Los Alamos, NM, United States, (19)NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States
Abstract:
Perseverance will search for signs of past habitable conditions on Mars during the upcoming NASA mission. In order to achieve that objective, the payload has several instruments that will analyze the Martian surface, among which is SuperCam, a multispectroscopic instrument capable of determining the geological and chemical composition of rocks from distances up to 7 meters [1,2]. In order to assess the quality of its Raman spectral parameters, Raman spectra of standard minerals and natural rocks were analyzed in Los Alamos National Laboratory (LANL), employing a setup comprised of the Flight Model-Body Unit / Engineering Qualification Model-Mast Unit (FM-BU/EQM-MU), while varying measurement conditions, such as temperature, distance (from 1.5 m to 7 m), and number of laser pulses accumulated on the CCD.
For gypsum, calcite, talc, apatite and quartz, the band center reproducibility was excellent regardless of the measurement conditions, obtaining a standard deviation between 0.1 and 4.3 cm-1, depending on the mineral and band position (the best were obtained for the bright minerals). In addition, it was observed that the relative standard deviation for Raman intensities (using areas under the curve to calculate it) was 10.7-15.1%, depending on the mineral.
In addition to the LANL experiments, the reproducibility of SuperCam’s Raman intensities were validated by comparing SuperCam’s Raman relative intensities of a white marble slab recorded during ATLO with the recorded intensities of the same sample by a commercial micro-Raman instrument (inVia-Raman, Renishaw). For the 282, 712 and 1086 cm-1 bands, the relative intensities for the main Raman signals were 0.40:0.11:1 for the inVia, and 0.44:0.11:1 for the (FM)SuperCam-Raman. The similarity of the SuperCam and μRaman measurements indicates that relative intensities of Raman bands could be used to characterize minerals and possible organic compounds found on Mars. Furthermore, analysis of Raman intensities and band positions given by SuperCam’s on-board calibration targets yields important insight into the Raman wavenumber calibration and instrument health through time, as SuperCam experiences Martian atmosphere conditions.
[1] R. C. Wiens et al., Spectroscopy, 32(5), 2017, 50-55.
[2] S. Maurice et al., 46th Lunar and Planetary Science conf., 2015, #1832
