Ultrasound Doppler array measurement system for two-dimensional flow investigations in liquid metals

This paper presents a specific ultrasound Doppler measurement system for investigations of the velocity field in electromagnetically driven liquid metal flows. Two orthogonally arranged ultrasound sensor line arrays facilitate a two-dimensional measurement of two velocity components (2d/2c) within a square area of 70 x 70 mm². The line array elements are controlled by a specific multiplex mode to achieve both a high spatial and a high temporal resolution. The sensor design, the control electronics and the mode of operation of the measurement system are described. Preliminary results of velocity measurements in a liquid metal flow driven by a rotating magnetic field (RMF) are presented.