TY - CONF
T1 - Illumination and image processing for real-time control of directed energy deposition additive manufacturing
AU - Seltzer, D.
AU - Schiano, J. L.
AU - Nassar, A. R.
AU - Reutzel, E. W.
N1 - Funding Information:
The authors would like to thank Ms. Dalonia O. Lenoir and Dr. Timothy B. Tighe for their assistance with the Optical Profilometry measurements. This work was supported by the Office of Naval Research, under Contract No. N00014-11-1-0668. Any opinions, findings, and conclusions or recommendations expressed in this publication are those of the authors and do not reflect the views of the Office of Naval Research.
Publisher Copyright:
© 2016 The Department of Energy’s Kansas City National Security Campus is operated and managed by Honeywell Federal Manufacturing Technologies, LLC under contract number DE-NA0002839.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2016
Y1 - 2016
N2 - This paper describes the optical setup and image processing required to estimate melt-pool width and build height for real-time control of melt-pool geometry in directed energy deposition additive manufacturing. To overcome optical interference from plasma emissions and laser interactions, the melt-zone is imaged using laser illumination. A single camera, fixed to the processing laser, views the laser interaction zone and provides images for estimating melt-zone width and build height. Using a bandpass filter and a single aspheric lens, the camera system provides sufficient magnification and depth of field to achieve a 1-mil (25.4 µm) resolution. Maintaining melt-zone geometry within desired tolerances requires an image acquisition and processing rate on the order of 100 frames per second. This bandwidth is achieved by a Camera Link camera and field-programmable gate array that implements algorithms for estimating melt-pool width and build height. The design and experimental verification of the camera, illumination, and processing systems are discussed.
AB - This paper describes the optical setup and image processing required to estimate melt-pool width and build height for real-time control of melt-pool geometry in directed energy deposition additive manufacturing. To overcome optical interference from plasma emissions and laser interactions, the melt-zone is imaged using laser illumination. A single camera, fixed to the processing laser, views the laser interaction zone and provides images for estimating melt-zone width and build height. Using a bandpass filter and a single aspheric lens, the camera system provides sufficient magnification and depth of field to achieve a 1-mil (25.4 µm) resolution. Maintaining melt-zone geometry within desired tolerances requires an image acquisition and processing rate on the order of 100 frames per second. This bandwidth is achieved by a Camera Link camera and field-programmable gate array that implements algorithms for estimating melt-pool width and build height. The design and experimental verification of the camera, illumination, and processing systems are discussed.
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M3 - Paper
AN - SCOPUS:85049255242
SP - 1479
EP - 1486
T2 - 27th Annual International Solid Freeform Fabrication Symposium - An Additive Manufacturing Conference, SFF 2016
Y2 - 8 August 2016 through 10 August 2016
ER -