%0 Journal Article %T Spectroscopic closed loop control of penetration depth in laser beam welding process %A Sibillano, Teresa %A Ancona, Antonio %A Rizzi, Domenico %A Mezzapesa, Francesco %A Konuk, Ali Riza %A Aarts, Ronald %A Huis in 't Veld, Bert %A Lugarà, Pietro Mario %J Proceedings of SPIE %V 8239 %N 1 %P 82390S-82390S-8 %@ 0277-786X %D 2012-01-24 %I SPIE %~ DeepDyve