Electrical capacitance tomography (ECT) is a new technology for testing parameters of solid-air two-phase flow during
the past decades. The key technique of ECT is the fast and accurate image reconstruction. In this paper, the principle and
measuring process of ECT were elaborated, the reconstruction algorithm called generalized vector sampled pattern
matching (GVSPM) method was used in two-phase flow particle concentration visualization. GVSPM method achieves
accurate reconstruction by using an objective function that is calculated as the inner product calculation between the
experimental capacitance and the reconstructed image capacitance. Mathematica simulation results showed that this
method proved superior in the three parameters of capacitance residual, image error and image correlation, compared
with the linear back projection (LBP) method. Using the GVSPM method, the "soft-field" effect and the ill-posed inverse
problem in ECT technology can be effectively conquered, meanwhile, the reconstructed image has the advantages of
high spatial resolution and low distortion.
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