Line-scan, fiber-based confocal sensing for surface characterization and thermal distribution monitoring for selective laser melting system

Yujie Yang; Thomas Weyrauch

doi:10.1117/12.3003059

12 March 2024 Line-scan, fiber-based confocal sensing for surface characterization and thermal distribution monitoring for selective laser melting system

Yujie Yang, Thomas Weyrauch

Author Affiliations +

Proceedings Volume 12876, Laser 3D Manufacturing XI; 128760A (2024) https://doi.org/10.1117/12.3003059
Event: SPIE LASE, 2024, San Francisco, California, United States

Abstract

Laser additive manufacturing of metallic materials may be improved by in-situ process monitoring. For example, determination of surface characteristics of the building layers and measurements of the temperature of the melting pool may be utilized in powder-bed selective laser melting systems. In this paper, we experimentally investigate the possibility of determining surface characteristics, specifically surface roughness, using a prototype setup comprising a fiber-based line-scan confocal optical system with a laser probe beam that operates at a low numerical aperture over at least 200 mm distance between its optical elements and the sample surface. A similar setup for thermal radiation, without the probe beam, was used to determine 2D thermal distributions at the melt pool and to demonstrate melt pool temperature stabilization.

Conference Presentation

Citation Download Citation

Yujie Yang and Thomas Weyrauch "Line-scan, fiber-based confocal sensing for surface characterization and thermal distribution monitoring for selective laser melting system", Proc. SPIE 12876, Laser 3D Manufacturing XI, 128760A (12 March 2024); https://doi.org/10.1117/12.3003059

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