Measurement of plasma electron density generated in an experiment of laser shock processing, utilizing the H­α­-line

Moreno-Diaz, Cristina and Alonso Medina, Aurelia and Colón Hernández, Cristóbal and Porro González, Juan Antonio and Ocaña Moreno, José Luis (2016). Measurement of plasma electron density generated in an experiment of laser shock processing, utilizing the H­α­-line. "Journal of Materials Processing Technology", v. 232 ; pp. 9-18. ISSN 0924-0136. https://doi.org/10.1016/j.jmatprotec.2016.01.026.

Description

Title: Measurement of plasma electron density generated in an experiment of laser shock processing, utilizing the H­α­-line
Author/s:
  • Moreno-Diaz, Cristina
  • Alonso Medina, Aurelia
  • Colón Hernández, Cristóbal
  • Porro González, Juan Antonio
  • Ocaña Moreno, José Luis
Item Type: Article
Título de Revista/Publicación: Journal of Materials Processing Technology
Date: June 2016
ISSN: 0924-0136
Volume: 232
Subjects:
Freetext Keywords: Laser shock processing; plasma diagnosis; electron density; Hydrogen
Faculty: E.T.S.I. Diseño Industrial (UPM)
Department: Ingeniería Eléctrica, Electrónica Automática y Física Aplicada
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

In this work we have realized plasma diagnosis produced by Laser (LPP), by means of emission spectroscopy in a Laser Shock Processing (LSP). The LSP has been proposed as an alternative technology, competitive with classical surface treatments. The ionic species present in the plasma together with electron density and its temperature provide significant indicators of the degree of surface effect of the treated material. In order to analyze these indicators, we have realized spectroscopic studies of optical emission in the laser-generated plasmas in different situations. We have worked focusing on an aluminum sample (Al2024) in air and/or in LSP conditions (water flow) a Q-switched laser of Nd:YAG (λ = 1.06 μm, 10 ns of pulse duration, running at 10 Hz repetition rate). The pulse energy was set at 2,5 J per pulse. The electron density has been measured using, in every case, the Stark broadening of H Balmer α line (656.27 nm). In the case of the air, this measure has been contrasted with the value obtained with the line of 281.62 nm of Al II. Special attention has been paid to the self-absorption of the spectral lines used. The measures were realized with different delay times after the pulse of the laser (1–8 μs) and with a time window of 1 μs. In LSP the electron density obtained was between 1017 cm−3 for the shortest delays (4–6 μs), and 1016 cm−3 for the greatest delays (7,8 μs).

Funding Projects

TypeCodeAcronymLeaderTitle
Government of SpainMAT2012-37782UnspecifiedUnspecifiedAnálisis integrado teórico-experimental de la técnica LSP aplicada a la mejora de propiedades mecánicas y superficiales de componentes metálicos de alta fiabilidad

More information

Item ID: 39474
DC Identifier: http://oa.upm.es/39474/
OAI Identifier: oai:oa.upm.es:39474
DOI: 10.1016/j.jmatprotec.2016.01.026
Official URL: https://doi.org/10.1016/j.jmatprotec.2016.01.026
Deposited by: Memoria Investigacion
Deposited on: 26 Feb 2016 09:48
Last Modified: 13 Mar 2019 16:39
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