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Based on Ant System Algorithm (ASA) and 12-electrode Electrical Capacitance Tomography (ECT) system, a new method is proposed for the on-line voidage measurement of oil-gas two-phase flow. The ASA is adopted to select the effective capacitance set (the capacitances in this set make significant contributions to the voidage measurement) from 66 measurement capacitances obtained from the ECT system and...