3D Reconstruction Based on 2D ERT Slices in Dredging Engineering

Electrical Resistance Tomography (ERT) can visually reconstruct target objects with high time resolution in a two-dimensional (2D) detection field. But in most applications, ERT can hardly reconstruct all three-dimensional (3D) objects due to unavailable measuring hardware or incomplete complex computation. This paper demonstrates that when the flow velocity is larger than the floating velocity in a pipe, all 3D objects can be reconstructed using a single sensor. The proposed method first recovers the relative invariance of all flow objects along the vertical direction of a pipe. Then a group of consecutive 2D ERT images is collected for any 3D objects. According to a typical 3D algorithm, all objects near the ERT sensor can be effectively reconstructed. Finally, the applicable range of the proposed method is illustrated. The 3D objects in the pipe of a self-made experimental platform are reconstructed to verify the effectiveness of the proposed method.