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

Moreno-Diaz, Cristina; Alonso Medina, Aurelia; Colón Hernández, Cristobal; Porro González, Juan Antonio y 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.

Descripción

Título: Measurement of plasma electron density generated in an experiment of laser shock processing, utilizing the H­α­-line
Autor/es:
  • Moreno-Diaz, Cristina
  • Alonso Medina, Aurelia
  • Colón Hernández, Cristobal
  • Porro González, Juan Antonio
  • Ocaña Moreno, José Luis
Tipo de Documento: Artículo
Título de Revista/Publicación: Journal of Materials Processing Technology
Fecha: Junio 2016
Volumen: 232
Materias:
Palabras Clave Informales: Laser shock processing; plasma diagnosis; electron density; Hydrogen
Escuela: E.T.S.I. Diseño Industrial (UPM)
Departamento: Ingeniería Eléctrica, Electrónica Automática y Física Aplicada
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

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).

Más información

ID de Registro: 39474
Identificador DC: http://oa.upm.es/39474/
Identificador OAI: oai:oa.upm.es:39474
Identificador DOI: 10.1016/j.jmatprotec.2016.01.026
URL Oficial: http://www.sciencedirect.com/science/article/pii/S0924013616300267
Depositado por: Memoria Investigacion
Depositado el: 26 Feb 2016 09:48
Ultima Modificación: 03 Mar 2017 16:39
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