Tomographic imaging sensor with variable capacitance

Abstract

The invention relates to a tomographic imaging sensor with variable capacitance. The tomographic imaging sensor comprises an external electrode layer and an internal electrode layer, wherein the two electrode layers adopt a coaxially-arranged two-layer cylindrical tube structure; n electrodes are uniformly inlaid on the outer surface of a tube wall of the internal electrode layer, and n electrodes are uniformly arranged on the inner wall of the external electrode layer; one of the external electrode layer and the internal electrode layer is fixed, the other can axially horizontally move and rotate, during rotation, outer sides of the n electrodes of the internal electrode layer make contact with inner sides of the n electrodes of the external electrode layer, and the duty ratios and the areas of the electrodes are changed; when the internal electrode layer and the external electrode layer make contact, one of the external electrode layer and the internal electrode layer is fixed, the other axially horizontally moves, and the areas of the electrodes are changed. By means of the tomographic imaging sensor, the ECT imaging quality can be improved.

Description

[0001] Technical field: [0002] The invention belongs to the field of Electrical Capacitance Tomography (ECT), and in particular relates to a tomography sensor. [0003] Background technique: [0004] ECT is a technology used to measure and display the distribution of two or more mixed insulating (non-conductive) materials in the measured area, these materials include: oil, natural gas, plastic polymers, glass, etc., when ECT When the sensor measures that the pipe wall is an insulating material, it can complete the tasks of data acquisition and image reconstruction in a non-invasive and non-contact measurement method. Its basic principle and structure are: use a group of multi-polar plates (metal conductive materials) to surround the inner wall or outer wall of the measurement pipe, and measure each pair of independent electrode pairs; calculate the mixed substance in the pipe according to the independent capacitance value obtained from the measurement The permittivity distri...

AI Technical Summary

Problems solved by technology

Generally, the array electrodes of ECT sensors are fixed, that is, the number of electrodes is fixed, mostly 8 or 12, and the size is fixed. The capacitance and duty cycle cannot be adjusted, so it is difficult for the sensor to achieve ideal measurement accuracy.

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