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Sensors 2009, 9(10), 7753-7770; doi:10.3390/s91007753
Article

Defect Detection in Arc-Welding Processes by Means of the Line-to-Continuum Method and Feature Selection

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Photonics Engineering Group, University of Cantabria, Avda. de los Castros S/N, 39005 Santander, Spain
* Author to whom correspondence should be addressed.
Received: 8 July 2009 / Revised: 28 August 2009 / Accepted: 24 September 2009 / Published: 29 September 2009
(This article belongs to the Section Chemical Sensors)
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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.
Keywords: arc-welding; plasma spectroscopy; feature selection; on-line monitoring arc-welding; plasma spectroscopy; feature selection; on-line monitoring
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Garcia-Allende, P.B.; Mirapeix, J.; Conde, O.M.; Cobo, A.; Lopez-Higuera, J.M. Defect Detection in Arc-Welding Processes by Means of the Line-to-Continuum Method and Feature Selection. Sensors 2009, 9, 7753-7770.

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