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Absorbance determination of a powder bed by high resolution coaxial multispectral imaging in laser powder bed fusion
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development. JENOPTIK Optical Systems GmbH, System Development Advanced Manufacturing, Göschwitzerstraße 25, 07745 Jena, Germany.ORCID iD: 0000-0001-8601-2923
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development. Fraunhofer Institute for Material and Beam Technology IWS, Winterbergstraße 28, 01277 Dresden, Germany.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.ORCID iD: 0000-0002-3569-6795
2024 (English)In: Optics and Laser Technology, ISSN 0030-3992, E-ISSN 1879-2545, Vol. 168, article id 109780Article in journal (Refereed) Published
Abstract [en]

This study presents an approach for in-situ monitoring of laser powder bed fusion. Using standard laser optics, coaxial high-resolution multispectral images of powder beds are acquired in a pre-objective scanning configuration. A continuous overview image of the entire 114 × 114 mm powder bed can be generated, detecting objects down to 20 µm in diameter with a maximum offset of 22–49 µm. Multispectral information is obtained by capturing images at 6 different wavelengths from 405 nm to 850 nm. This allows in-line determination of the absorbance of the powder bed with a maximum deviation of 2.5% compared to the absorbance spectra of established methods. For the qualification of this method, ray tracing simulations on powder surfaces and tests with 20 different powders have been carried out. These included different particle sizes, aged and oxidized powders.

Place, publisher, year, edition, pages
Elsevier, 2024. Vol. 168, article id 109780
Keywords [en]
Spectroscopic Measurement, Correction Method, Laser Powder Bed Fusion, Scanning Method, Metal Powder, Multispectral Imaging, Laser Material Processing
National Category
Manufacturing, Surface and Joining Technology
Research subject
Manufacturing Systems Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-99249DOI: 10.1016/j.optlastec.2023.109780ISI: 001051885900001Scopus ID: 2-s2.0-85166468238OAI: oai:DiVA.org:ltu-99249DiVA, id: diva2:1785491
Note

Validerad;2023;Nivå 2;2023-08-07 (hanlid)

Available from: 2023-08-02 Created: 2023-08-02 Last updated: 2024-03-07Bibliographically approved

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Brandau, BenediktBrueckner, FrankKaplan, Alexander F. H.

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