An optical sensor suitable for detecting the main faults which can occur during the laser welding process is described. Process-generated light is collected using an optical fibre and welding errors are detected by analysis of the temporal and chromatic characteristics of this light.
D. P. Hand, D. P. Hand,
"Non-intrusive optical sensor for laser welding", Proc. SPIE 4185, Fourteenth International Conference on Optical Fiber Sensors, 41855V (9 November 2000); doi: 10.1117/12.2302354; https://doi.org/10.1117/12.2302354