Spatially resolved temperature detection by double scanner and high speed pyrometry for process stabilization of SLS processes

Christian Zander; Jan F. Düsing; Gerrit Hohenhoff; Peter Jäschke; Stefan Kaierle; Ludger Overmeyer

doi:10.1117/12.2607361

4 March 2022 Spatially resolved temperature detection by double scanner and high speed pyrometry for process stabilization of SLS processes

Christian Zander, Jan F. Düsing, Gerrit Hohenhoff, Peter Jäschke, Stefan Kaierle, Ludger Overmeyer

Author Affiliations +

Proceedings Volume 11992, Laser 3D Manufacturing IX; 119920C (2022) https://doi.org/10.1117/12.2607361
Event: SPIE LASE, 2022, San Francisco, California, United States

Conference Poster

Abstract

Current strategies for closed loop control of the temperature sensitive selective laser sintering (SLS) process are often based on slow thermal cameras. Another method is single scanner pyrometry. In that case the pyrometer uses the same scanner as the laser. The pyrometer measuring spot and the laser spot are always in the same position. It is not possible to measure temperature outside of the laser spot. In a novel approach, a highly dynamic double scanner system is used to position the measuring beam of a high speed pyrometer. With this approach it is possible to position the laser and measurement spot independently on the powder bed surface (e.g. leading or trailing measurement relative to the laser spot). A very fast pyrometer which outputs measurement data up to 50 kilohertz and FPGA (Field Programmable Gate Array) technology will be used for real time processing of the measured temperature. With this it is possible to process temperature fluctuations on the surface and respond to them very quickly. This technique should be applied to make the SLS process more stable and to get the best results out of the entire build volume. For this purpose, the measured temperature is used to dynamically control the power of the laser.

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Christian Zander, Jan F. Düsing, Gerrit Hohenhoff, Peter Jäschke, Stefan Kaierle, and Ludger Overmeyer "Spatially resolved temperature detection by double scanner and high speed pyrometry for process stabilization of SLS processes", Proc. SPIE 11992, Laser 3D Manufacturing IX, 119920C (4 March 2022); https://doi.org/10.1117/12.2607361

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