1 Introduction</h5> Electrical Resistance Tomography (ERT) can implement the parameter measurement of conductive two-phase flows by providing cross-sectional images and has broad application prospects in many industrial fields, such as petroleum, chemical engineering, environment protection, etc. [1–4] . However, the conventional ERT systems are on the basis of contact conductivity detection technique, the electrodes are directly in contact with the conductive fluid, that may result in electrochemical erosion effect and polarization effect of the electrodes. Meanwhile, unpredictable measurement errors will arise, if the electrodes are contaminated. These drawbacks limit the practical applications of the conventional ERT systems.</P>Capacitively Coupled Contactless Conductivity Detection (C 4 D) was proposed by Zemann et al.  and da Silva and do Lago  independently in 1998. Its measurement principle is shown in Fig. 1 . A typical C 4 D sensor consists of an insulating pipe, two metal electrodes (an excitation electrode and a detection electrode) placed cylindrically around the outer surface of the insulating pipe, an AC source and an AC current pick-up unit, as shown in Fig. 1 (a). The electrodes, the insulating pipe and the conductive fluid can form two coupling capacitances C 1 and C 2 , and the
Flow Measurement and Instrumentation – Elsevier
Published: Dec 1, 2014
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