Monitoring of Air Bubbles in Pulp Flow based on Electrical Impedance Tomography

Shaomin Zhou, Jouko Halttunen

Institute of Measurement and Information Technology, Tampere University of Technology,

P.O. Box 692, FIN-33720 Tampere, Finland, shaomin.zhou@tut.fi

ABSTRACT

Electrical impedance tomography (EIT) offers a non-intrusive method to measure the resistivity distribution within a domain. This paper focuses on applying this technique to monitor air bubbles in pulp flow. The cross-sectional image is reconstructed by Modified Newton-Raphson algorithm. Sinusoidal excitation and DC pulse excitation are implemented in the prototype system. Preliminary results show that the air bubbles can be identified in the pulp.

Keywords Electrical impedance tomography, air bubble, flow measurement