Rotatable planar electrical capacitance tomography sensor

Abstract

The invention discloses a rotatable planar electrical capacitance tomography sensor which comprises a planar electrical capacitance measuring electrode array, a substrate, a shielding shell, a sleeve,a fixed end cap, a rotating position indicating sheet and an initial and final position indicating sheet. The planar capacitance measuring electrode array is arranged on the upper plane of the substrate, the lower plane of the substrate is connected with the rotating center shaft, and the rotating center shaft sequentially penetrates through a center hole of the shielding shell and the sleeve andis finally connected with the fixed end cap with the rotating position indicating piece. The electrode array comprises a plurality of fan-shaped outer ring electrodes and inner ring electrodes whichare distributed at equal intervals and formed by taking the center of the substrate as an original point, the fan-shaped outer ring electrodes and the inner ring electrodes are arranged in a staggeredmanner, and gaps are formed between fan-shaped inner arcs of the outer ring electrodes and fan-shaped outer arcs of the inner ring electrodes. The sensor has the beneficial effects that the media with anisotropism of different dielectric constants can be detected, so that the sensitivity is relatively uniformly distributed under different conditions, and the PECT can obtain a relatively good imaging effect in various media.

Description

technical field [0001] The invention relates to an electrical tomography sensor, in particular to a rotatable planar capacitance tomography sensor. Background technique [0002] Planar Electrical Capacitance Tomography (PECT) obtains a set of column capacitance measurements based on electrode arrays distributed in the same plane, and uses the relationship between the dielectric constant ε of the measured medium and the distribution of the medium to reconstruct the distribution of the medium. images, and have a wide range of application scenarios. The number of commonly used PECT sensor electrodes is 12 or 16, and a measurement can obtain 66 or 120 independent measurements respectively. [0003] For object detection and damage detection, especially when the dielectric constant of the medium is anisotropic, the damage mechanism is very complicated, it is difficult to estimate and measure accurately, and the detection is usually only from one surface, which is difficult to imp...

AI Technical Summary

Problems solved by technology

[0005] Existing PECT sensors are mainly designed for isotropic dielectric constant materials, and the greater sensitivity is mainly distributed in the electrode gap, and there is less consideration for the analysis of dielectric constant anisotropy

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