International Journal of Extreme Manufacturing, Volume. 1, Issue 3, 35002(2019)
3D particle tracking velocimetry for the determination of temporally resolved particle trajectories within laser powder bed fusion of metals
Within this work, we present a system for the measurement of the three-dimensional (3D) trajectories of spatters and entrained particles during laser powder bed fusion (L-PBF) of metals. It is comprised of two ultrahigh-speed cameras and a reconstruction task specific processing reconstruction algorithm. The system enables an automated determination of 3D measures from the trajectories of a large number of tracked particles. Ambiguity evolving from an underdetermined geometrical situation induced by a two-camera setup is resolved within the tracking using a priori knowledge of L-PBF of metals. All processing steps were optimized to run on a graphics processing unit to allow the processing of large amounts of data within an appropriate time frame. The overall approach was validated by a comparison of the measurement results to synthetic images with a known 3D ground truth.
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Eric Eschner, Tobias Staudt, Michael Schmidt. 3D particle tracking velocimetry for the determination of temporally resolved particle trajectories within laser powder bed fusion of metals[J]. International Journal of Extreme Manufacturing, 2019, 1(3): 35002
Received: Jul. 31, 2019
Accepted: --
Published Online: Jun. 4, 2020
The Author Email: Eschner Eric (eric.eschner@lpt.uni-erlangen.de)