Study on a voidage measurement method based on ERT system and Otsu algorithm

A new voidage measurement method for gas-liquid two-phase flow based on electrical resistance tomography (ERT) and Otsu algorithm is studied. A 16-electrode ERT system carries out for data collection and image reconstruction. Otsu algorithm is used to select the threshold adaptively and binarize the reconstructed images. According to the binarized images, the cross-sectional void fraction of gas-liquid two-phase flow is calculated. Then the average void fraction can be achieved through continuous sampling. Experiments show that the errors of the measured average void fraction values are within 8% and the method is effective.

[1]  David G. Luenberger,et al.  Linear and nonlinear programming , 1984 .

[2]  Torbjørn Sund,et al.  An algorithm for fast adaptive image binarization with applications in radiotherapy imaging , 2003, IEEE Transactions on Medical Imaging.

[3]  Eung Je Woo,et al.  A robust image reconstruction algorithm and its parallel implementation in electrical impedance tomography , 1993, IEEE Trans. Medical Imaging.

[4]  Willis J. Tompkins,et al.  Comparing Reconstruction Algorithms for Electrical Impedance Tomography , 1987, IEEE Transactions on Biomedical Engineering.

[5]  N. Otsu.  A threshold selection method from gray level histograms , 1979 .

[6]  Steven L. Ceccio,et al.  Validation of Electrical-Impedance Tomography for Measurements of Material Distribution in Two-Phase Flows , 2000 .

[7]  C. J. Kotre,et al.  A sensitivity coefficient method for the reconstruction of electrical impedance tomograms. , 1989, Clinical physics and physiological measurement : an official journal of the Hospital Physicists' Association, Deutsche Gesellschaft fur Medizinische Physik and the European Federation of Organisations for Medical Physics.