Electrical Capacitance-Ultrasonic Dual-mode Tomography for Gas-liquid Two-Phase Flow

Both the electrical capacitance tomography (ECT) and ultrasonic tomography (UT) can be used for processing imaging of gas-liquid two-phase flow. ECT can be used to reconstruct the permittivity distributions of the cross section, while UT is skilled to distinguish the boundaries of two-phase. In this paper, an image reconstruction method merging ECT and ultrasonic reflection tomography (URT) is proposed to improve the quality of the reconstructed image. The permittivity distribution reconstructed by ECT and sound velocity distribution reconstructed by URT are processed by pixel-to-pixel thresholding fusion method. Simulations were conducted to evaluate performance of the proposed method. The results show that the proposed dual-mode fusion method based on ECT and URT possess higher image quality and higher measurement accuracy of void fraction, compared with the single-mode method.