Towards in-situ process monitoring in selective laser sintering using optical coherence tomography

2016 ◽  
Author(s):  
Guangying Guan ◽  
Zeng H. Lu ◽  
Matthias Hirsch ◽  
Ruth Goodridge ◽  
David T. D. Childs ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Process Monitoring ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Optical Coherence

scholarly journals In situ process monitoring in selective laser sintering using optical coherence tomography

2018 ◽  
Vol 57 (04) ◽  
pp. 1 ◽  
Author(s):  
Michael R. Gardner ◽  
Adam Lewis ◽  
Jongwan Park ◽  
Austin B. McElroy ◽  
Arnold D. Estrada ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Process Monitoring ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Optical Coherence

scholarly journals Evaluation of selective laser sintering processes by optical coherence tomography

2015 ◽  
Vol 88 ◽  
pp. 837-846 ◽  
Author(s):  
Guangying Guan ◽  
Matthias Hirsch ◽  
Zeng Hai Lu ◽  
David T.D. Childs ◽  
Stephen J. Matcher ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Optical Coherence ◽  
Sintering Processes

scholarly journals Loose powder detection and surface characterization in selective laser sintering via optical coherence tomography

2016 ◽  
Vol 472 (2191) ◽  
pp. 20160201 ◽  
Author(s):  
Guangying Guan ◽  
Matthias Hirsch ◽  
Wahyudin P. Syam ◽  
Richard K. Leach ◽  
Zhihong Huang ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Surface Texture ◽  
Surface Characterization ◽  
Selective Laser Sintering ◽  
Variable Density ◽  
Laser Sintering ◽  
Layer By Layer ◽  
Optical Coherence ◽  
Surface Profiling ◽  
Loose Powder

Defects produced during selective laser sintering (SLS) are difficult to non-destructively detect after build completion without the use of X-ray-based methods. Overcoming this issue by assessing integrity on a layer-by-layer basis has become an area of significant interest for users of SLS apparatus. Optical coherence tomography (OCT) is used in this study to detect surface texture and sub-surface powder, which is un-melted/insufficiently sintered, is known to be a common cause of poor part integrity and would prevent the use of SLS where applications dictate assurance of defect-free parts. To demonstrate the capability of the instrument and associated data-processing algorithms, samples were built with graduated porosities which were embedded in fully dense regions in order to simulate defective regions. Simulated in situ measurements were then correlated with the process parameters used to generate variable density regions. Using this method, it is possible to detect loose powder and differentiate between densities of ±5% at a sub-surface depth of approximately 300 μm. In order to demonstrate the value of OCT as a surface-profiling technique, surface texture datasets are compared with focus variation microscopy. Comparable results are achieved after a spatial bandwidth- matching procedure.

Optical Coherence Tomography for the Detection of Laser In Situ Keratomileusis in Donor Corneas

Cornea ◽  
2003 ◽  
Vol 22 (1) ◽  
pp. 46-50 ◽  
Author(s):  
Siegfried G. Priglinger ◽  
Aljoscha S. Neubauer ◽  
Christian-Albrecht May ◽  
Claudia S. Alge ◽  
Armin H. Wolf ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Laser In Situ Keratomileusis ◽  
Optical Coherence ◽  
Donor Corneas
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