Fringe Effect-Induced Artifact Suppression via Reconstruction Discrepancy-Based Measurement Correction in Dual-Plane ERT

Electrical Resistance Tomography (ERT) is widely used for multiphase flow monitoring due to its non-invasiveness and high temporal resolution. However, the fringe effect induces artifacts in the reconstructed images from conductivity perturbations beyond the measurement plane, compromising tomographic imaging accuracy. Existing mitigation strategies, such as sensor structural optimization or multi-plane auxiliary imaging, face limitations like extended sensing ranges or the requirement for prior object knowledge. In this paper, a boundary measurement correction method based on reconstruction discrepancies in dual-plane ERT is proposed to suppress the fringe effect-induced artifacts. The distinct sensitivity responses of dual planes to identical spatial perturbations can be manifested as discrepancies in dual-plane reconstructed images. Based on these discrepancies, it is able to extract the measurement components corresponding to the perturbations within the measurement plane. Independent reconstruction of these components eliminates the artifacts induced by the perturbations outside the measurement plane. The results demonstrate substantial improvement in reconstruction quality after correction, significantly outperforming the grounded-guard single-plane tomography and dual-plane 3D tomography. The correction method also shows robust suppression capability for perturbations at arbitrary off-plane locations and superiority in handling severe fringe effect induced by axially longer perturbations.