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oai:riuma.uma.es:10630/239702026-02-03T10:57:40Zcom_10630_2254col_10630_37953

Towards airborne laser-induced breakdown spectroscopy: A signal recovery method for LIBS instruments subjected to vibrations Palanco-López, Santiago Aranda Ruiz, Sergio Mancebo, Francisco J. López-Escalante, María Cruz Leinen, Dietmar Ramos-Barrado, José Ramón Aviones sin piloto Sample or instrument vibrations can scatter laser impacts across the sample surface, which increases the uncertainty of laser-induced breakdown spectroscopy (LIBS) measurements. The common sources of noise associated to mechanical vibration are described and a method for isolating LIBS measurements from artifacts introduced by such fluctuations is presented. The approach circumvents the use of mechanical stabilizers by leveraging simple components common in LIBS systems. A camera was used to capture close-up images of the sample for each laser shot and the laser spot position in the sample surface was measured using common image processing techniques. By associating spectra with spatial coordinates in the sample surface, it was possible to reduce the relative standard deviation of the Cu(I) 427.51 nm signal in a patterned Cu/Al sample from 122.0% to 53.31%, similar to that measured for a pure Cu sample in the same vibration conditions. The spatial resolution of the method was found to depend on the laser spot diameter, the illuminance at the sample, the camera sensitivity and trigger insertion delay, and the speed of the laser beam sweeping the sample surface. The spatial resolution obtained with the setup used was ±0.6 mm at 15 m, i.e., 40 μm per meter of separation between the instrument and the sample with a vibration speed limit of 12 cm·s−1. 2022-04-26T06:44:24Z 2022-04-26T06:44:24Z 2022-01 journal article Palanco-Lopez, Santiago ; Aranda Ruiz, Sergio ; Mancebo, Francisco J. ; López-Escalante, María Cruz ; Leinen, Dietmar ; Ramos-Barrado, Jose Ramon. Towards airborne laser-induced breakdown spectroscopy: A signal recovery method for LIBS instruments subjected to vibrations. Spectrochimica Acta Part B: Atomic Spectroscopy Volume 187, January 2022, 106342. https://doi.org/10.1016/j.sab.2021.106342 https://hdl.handle.net/10630/23970 10.1016/j.sab.2021.106342 eng http://creativecommons.org/licenses/by-nc-nd/4.0/ open access Attribution-NonCommercial-NoDerivatives 4.0 Internacional Elsevier