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. © 2009 by the authors.
Garcia-Allende, P. B., Mirapeix, J., Conde, O. M., Cobo, A., & Lopez-Higuera, J. M. (2009). Defect detection in arc-welding processes by means of the line-to-continuum method and feature selection. Sensors, 9(10), 7753–7770. https://doi.org/10.3390/s91007753