Inductive detection of the free surface of liquid metals

A novel measurement system to determine the surface position and topology of liquid metals is presented. It is based on the induction of eddy currents by a time-harmonic magnetic field and the subsequent measurement of the resulting secondary magnetic field using gradiometric induction coils. The sy...

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Bibliographic Details
Published in:Measurement science & technology 2017-11, Vol.28 (11), p.115301
Main Authors: Zürner, Till, Ratajczak, Matthias, Wondrak, Thomas, Eckert, Sven
Format: Article
Language:English
Subjects:
inductive measurement
liquid metal
surface topology
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Summary:A novel measurement system to determine the surface position and topology of liquid metals is presented. It is based on the induction of eddy currents by a time-harmonic magnetic field and the subsequent measurement of the resulting secondary magnetic field using gradiometric induction coils. The system is validated experimentally for static and dynamic surfaces of the low-melting liquid metal alloy gallium-indium-tin in a narrow vessel. It is shown that a precision below 1 mm and a time resolution of at least 20 Hz can be achieved.
ISSN:0957-0233
1361-6501
DOI:10.1088/1361-6501/aa7f58