title: Defect Detection in Arc-Welding Processes by Means of the Line-to-Continuum Method and Feature Selection.
abstract: Plasma optical spectroscopy is widely employed in on-line welding diagnostics. The determination of the plasma electron temperature, which is typically selected as the output monitoring parameter, implies the identification of the atomic emission lines. As a consequence, additional processing stages are required with a direct impact on the real time performance of the technique. The line-to-continuum method is a feasible alternative spectroscopic approach and it is particularly interesting in terms of its computational efficiency. However, the monitoring signal highly depends on the chosen emission line. In this paper, a feature selection methodology is proposed to solve the uncertainty regarding the selection of the optimum spectral band, which allows the employment of the line-to-continuum method for on-line welding diagnostics. Field test results have been conducted to demonstrate the feasibility of the solution.
authors.affiliation: Photonics Engineering Group, University of Cantabria, Avda. de los Castros S/N, 39005 Santander, Spain; E-Mails:  jesus.mirapeix@unican.es  (J.M.);  olga.conde@unican.es  (O.M.C.);  adolfo.cobo@unican.es  (A.C.);  miguel.lopezhiguera@unican.es  (J.M.L.-H.).
authors.forename: P Beatriz
authors.initials: PB
authors.lastname: Garcia-Allende
authors.forename: Jesus
authors.initials: J
authors.lastname: Mirapeix
authors.forename: Olga M
authors.initials: OM
authors.lastname: Conde
authors.forename: Adolfo
authors.initials: A
authors.lastname: Cobo
authors.forename: Jose M
authors.initials: JM
authors.lastname: Lopez-Higuera