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Proceedings Paper

Real-time control of surface treatments with liquid phase: molten-depth on-line estimation
Author(s): Hugues Derouet; Frederic Coste; Lilian Sabatier; Remy Fabbro
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Paper Abstract

Surface treatments with remelting have often irregular quality. This article presents on-line control of laser melting which induces an improved quality of the treatment and more regular results. In order to build up a regulator, different sensor have been experimented. Responses are analyzed versus static and dynamic process commands. The molten depth is estimated on-line from molten pool dimensions measured by the CCD camera and image on-line processing. A state model is developed. The system is controlled by three variables: sample velocity, laser power and intensity distribution. The outputs of the system are the depth and width of the melted zone, and the temperature field. The commands and the outputs are chosen in accordance with the application under consideration. Therefore the process has been regulated.

Paper Details

Date Published: 23 September 1996
PDF: 9 pages
Proc. SPIE 2789, High-Power Lasers: Applications and Emerging Applications, (23 September 1996); doi: 10.1117/12.251187
Show Author Affiliations
Hugues Derouet, Lab. d'Applications des Lasers de Puissance/ETCA (France)
Frederic Coste, Lab. d'Applications des Lasers de Puissance/ETCA (France)
Lilian Sabatier, Lab. d'Applications des Lasers de Puissance/ETCA (France)
Remy Fabbro, Lab. d'Applications des Lasers de Puissance/ETCA (France)


Published in SPIE Proceedings Vol. 2789:
High-Power Lasers: Applications and Emerging Applications
Georges Sayegh; Michael R. Osborne, Editor(s)

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