Adaptive feedback beam shaping of the CO2 welding laser

0352708 - ÚPT 2014 RIV US eng C - Konferenční příspěvek (zahraniční konf.)
Jedlička, Petr - Mrňa, L. - Šarbort, M. - Řeřucha, Šimon
Adaptive feedback beam shaping of the CO2 welding laser.
Laser Beam Shaping XI (Proceedings of SPIE Vol. 7789). Bellingham: SPIE, 2010, 77890V: 1-8. ISBN 978-0-8194-8285-3.
[Laser Beam Shaping XI. San Diego (US), 02.08.2010]
Grant CEP: GA MPO 2A-3TP1/113
Výzkumný záměr: CEZ:AV0Z20650511
Klíčová slova: laser beam welding * adaptive optics * laser welding control * light emission monitoring
Kód oboru RIV: BH - Optika, masery a lasery

The depth of penetration is probably the most important factor that influences the quality of a laser weld. The depth strongly depends on the focus of the welding beam. The sublimating material forms plasma vapors, that act as a lens and defocus the laser beam. Our contribution presents a method to compensate this phenomenon using an adaptive mirror - a mirror with flexible surface that can adjust the shape of the welding beam. The mirror is regulated by a feedback control loop so that the focus of the laser beam and the penetration depth remain in an optimal range. Since the only possibility to state the penetration depth is to monitor outer effects to estimate desired parameters. a sensor unit is used to monitor the optical emissions of the plasma vapors and the measured data are inputs to an algorithm that estimates the penetration depth.
Trvalý link: http://hdl.handle.net/11104/0192158