| About this Abstract |
| Meeting |
2023 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2023)
|
| Symposium
|
2023 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2023)
|
| Presentation Title |
Wide-field Low-coherence Interferometry for Keyhole Depth Measurements in Laser Powder Bed Fusion |
| Author(s) |
Matthias Beuting, Kayvan Samimi, Sayed H. Hojjatzadeh, Erick L. Oberstar, Melissa C. Skala, Lianyi Chen, Scott T. Sanders |
| On-Site Speaker (Planned) |
Matthias Beuting |
| Abstract Scope |
We present a method for measuring keyhole depth and high-frequency melt pool fluctuations in laser powder bed fusion using optical interferometry. Previous studies utilized a technique called inline coherent imaging (ICI) based on the same principle involving scanning a focused interrogation beam across the area of interest to measure melt pool topography. In contrast, our proposed approach uses an enlarged beam fixed in position relative to the process laser to cover the entire keyhole area. We demonstrate that depth information can be reconstructed from this signal, enabling the identification of the lowest point within the keyhole. Eliminating the need for precise mechanical beam steering can improve time resolution while reducing the complexity and cost of on-machine sensors. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |