| About this Abstract |
| Meeting |
2024 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2024)
|
| Symposium
|
2024 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2024)
|
| Presentation Title |
Optical Tomography based on Near Infrared Imaging for Spatter and Distortion Detection in LPBF |
| Author(s) |
Eduardo Miramontes, Caleb Thomas Campbell, Brett Brady Eugene, Shuchi Khurana, Bradley Jared |
| On-Site Speaker (Planned) |
Eduardo Miramontes |
| Abstract Scope |
Laser Powder Bed Fusion(LPBF) has made significant strides, especially in the Aerospace, Defense and bio-medical industries. However, the process continues to be hampered by flaws such as distortion and spatter caused by process instability and cyclical thermal loading. To address the continued necessity for a system capable of detecting such flaws in-situ, in real time, an imaging technique known as Optical Tomography(OT) is being developed. By employing a near-infrared sensor, long exposure image capture, band-pass and neutral density filters, partial laser path images are obtained, which are combined into a cumulative image showing the pathway of the laser across a layer and variations in laser energy. Useful features are extracted from the images using Computer Vision(CV) and utilized to create a predictive model for pre and post-build distortion, and spatter. CT scanning and metallography supplied the ground truth for predictive models. Model predictions were tested on a validation build. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |