Bubble detection in liquid metals
The detection of bubbles in liquid metals is important for many technical applications. The opaqueness and the high temperature of liquid metals set high demands on the measurement system. The high electrical conductivity of the liquid metal can be exploited for contactless methods based on electromagnetic induction. Challenge is the detection of the weak conducting bubble inside the liquid metal.
The video present an ascending bubble inside a quadratic cube. The alternating excitation field is applied with the black rectangular coil. The induced voltage UInd captured with the red/blue planar gradiometer.
Gundrum, T.; Büttner, P.; Dekdouk, B.; Peyton, A.; Wondrak, T.; Galindo, V.; Eckert, S.
Contactless Inductive Bubble Detection in a Liquid Metal Flow
Sensors 16(2016)1, 63