RT Journal Article
T1 LIBS-Acoustic Mid-Level Fusion Scheme for Mineral Differentiation under Terrestrial and Martian Atmospheric Conditions
A1 Álvarez-Llamas, César
A1 Purohit, Pablo
A1 Laserna-Vázquez, José Javier
K1 Calcita
AB The shockwave produced alongside the plasma during a laser-induced breakdown spectroscopy event can be recorded as an acoustic pressure wave to obtain information related to the physical traits of the inspected sample. In the present work, a mid-level fusion approach is developed using simultaneously recorded laser-induced breakdown spectroscopy (LIBS) and acoustic data to enhance the discrimination capabilities of different iron-based and calcium-based mineral phases, which exhibit nearly identical spectral features. To do so, the mid-level data fusion approach is applied concatenating the principal components analysis (PCA)-LIBS score values with the acoustic wave peak-to-peak amplitude and with the intraposition signal change, represented as the slope of the acoustic signal amplitude with respect to the laser shot. The discrimination hit rate of the mineral phases is obtained using linear discriminant analysis. Owing to the increasing interest for in situ applications of LIBS + acoustics information, samples are inspected in a remote experimental configuration and under two different atmospheric traits, Earth and Mars-like conditions, to validate the approach. Particularities conditioning the response of both strategies under each atmosphere are discussed to provide insight to better exploit the complex phenomena resulting in the collected signals. Results reported herein demonstrate for the first time that the characteristic sample input in the laser-produced acoustic wave can be used for the creation of a statistical descriptor to synergistically improve the capabilities of LIBS of differentiation of rocks
PB American Chemical Society
YR 2022
FD 2022-01-12
LK https://hdl.handle.net/10630/24293
UL https://hdl.handle.net/10630/24293
LA eng
NO Álvarez Llamas, César,  Purohit, Pablo,  Laserna-Vázquez, José Javier; LIBS-Acoustic Mid-Level Fusion Scheme for Mineral Differentiation under Terrestrial and Martian Atmospheric Conditions. Anal. Chem. 2022, 94, 3, 1840–1849 Publication Date:January 12, 2022 https://doi.org/10.1021/acs.analchem.1c04792
NO Fundings for this work were provided by the projects UMA18-FEDERJA-272 from the Junta de Andalucía and PID2020-119185GB-I00 from Ministerio de Ciencia e Innovación, Spain. P.P. is grateful to the Junta de Andalucía for his contract under the program Garantía Juvenil. Universidad de Málaga / CBUA".
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 22 ene 2026