Novel ultrasound array measurement system for flow mapping of complex liquid metal flows R. Nauber, M. Burger, L. Büttner, S. Franke, D. Räbiger, S. Eckert and J. Czarske Eur. Phys. J. Special Topics, 220 (2013) 43-52 Published online: 26 March 2013 DOI: 10.1140/epjst/e2013-01795-1