Numerical study of improving spatial sensitivity uniformity

What is it about?

This study introduces an elliptical inductive sensor as a geometry-based alternative to the ring. Using a cross-sectional sensitivity simulation model, an elliptical electrode sensor (major axis a = 10 mm, minor axis b = 6 mm) was compared with conventional ring electrodes using quantitative uniformity metrics. Results demonstrate that the elliptical electrode sensor geometry achieves near-homogeneous response (Uniformity Index, UI ≥ 0.9) for electrode axial width, W ≈ a, whereas the ring sensor requires the axial width on the order of the pipe diameter to reach comparable homogeneity. Under identical modelling conditions, the elliptical electrode sensor achieves greater uniformity and reduces centre–edge disparity compared to ring electrodes enabling balanced charge measurements with improved homogeneity and good resolution.

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Why is it important?

This study has examined the influence of electrode geometry on the spatial sensitivity of electrostatic inductive sensors using a comparative numerical framework. The conventional ring electrode was used as a baseline, reproducing the well-known peripheral bias in sensitivity and confirming that near-homogeneous response is achieved only at large electrode widths, where particle-level charge resolution is diminished. Introducing an elliptical electrode sensor geometry provides an alternative method.

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