Towards airborne laser-induced breakdown spectroscopy: A signal recovery method for LIBS instruments subjected to vibrations
| Autor: | Sergio Aranda, M.C. López-Escalante, S. Palanco, Francisco Mancebo, José R. Ramos-Barrado, Dietmar Leinen |
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| Rok vydání: | 2022 |
| Předmět: |
Materials science
LIBS business.industry Noise (signal processing) UAV Illuminance Laser-induced breakdown spectroscopy Unmanned aerial vehicle Laser Signal Sample (graphics) Atomic and Molecular Physics and Optics Stand-offRemote Analytical Chemistry law.invention Vibration Optics law Airborne business Aviones sin piloto Instrumentation Image resolution Spectroscopy |
| Zdroj: | RIUMA. Repositorio Institucional de la Universidad de Málaga instname |
| Popis: | 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. The authors would like to express their gratitude to Carlos Malagon ´of Astroshop (Málaga, Spain) for donating the telescope used in the stand-off LIBS instrument. This work has been partially supported by the Programa Estatal para la Incorporacion ´ Estable de Doctores (IEDI-2017-00828) and by the I Plan Propio de Investigacion ´ de la Universidad de Malaga ´ (Spain). Funding for open access charge: Universidad de Malaga/CBUA. |
| Databáze: | OpenAIRE |
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