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OCT for process monitoring of laser transmission welding

Inline tracking of weld seams enables monitoring and quality control of polymer welding processes
: Schmitt, Robert; Ackermann, Philippe

Laser-Technik-Journal (2016), Nr.5, S.15-18
ISSN: 1613-7728
ISSN: 1863-9119
Fraunhofer IPT ()
Lasermaterialbearbeitung; Messtechnik; optical metrology; optische Messtechnik; Prozessüberwachung

Non-destructive monitoring of laser transmission welding of polymers is a crucial topic in different production areas. Process parameter deviation may result in product failure. Current monitoring often relies on post process or inline methods which are not able to give a qualitative process feedback. Optical Coherence Tomography (OCT) enables tomographic measurements of transparent material structures with a few microns resolution. It provides high accuracy for monitoring and quality assurance of pre, inline and post process situations.