A capacitive tomography sensor with helical electrodes

Abstract

The invention discloses an electrical capacitance tomography sensor with helical-structure electrodes, wherein the sensor belongs to the electrical capacitance tomography (ECT) equipment field. The sensor comprises a main body structure part and a capacitance measurement part. The main body structure part is formed by an insulating tube and a fixed support; and the circular space in the insulating tube is measured space. The capacitance measurement part is characterized in that radical electrodes are arranged between detection electrodes; and the radial electrodes are connected with electrode ends in a shielding mode. When the sensor works, capacitance values obtained by measuring the electrodes are transmitted to ECT signal acquisition equipment by signal transmission cables arranged at surfaces of the detection electrodes; after signal processing, detected capacitance signals are converted into electrical signals; the signals are transmitted to a computer terminal; and then the signals are reconstructed to form images based on a reconstruction algorithm of the computer. According to the invention, thermal parameter information including material position distribution, shapes, temperatures, humidity, and flowing speeds, and directions and the like of materials at any place in the measured space at the axial direction can be reconstructed, so that the major breakthrough of the ECT detection technology in terms of three-dimensional imaging is also realized.

Description

technical field [0001] The invention belongs to the scope of an electric capacitance tomography imaging device, in particular to an electric capacitance tomography sensor with a spiral structure electrode. Background technique [0002] Electrical Capacitance Tomography (ECT) is a multiphase flow parameter detection technology developed in the mid-1980s. ECT technology is based on the capacitance sensitive mechanism. When the shape and distribution of the multiphase flow medium in the measured area changes, it will cause the capacitance value between the detection capacitor plates to change, so as to reconstruct the multiphase flow in the measured area through the reconstruction algorithm. distribution image. [0003] The source of the capacitance of the ECT system is the sensor. The traditional ECT sensor is mostly a two-dimensional sensor structure arranged in a single layer, generally an array structure of 8, 12, and 16 electrodes. These electrodes are only arranged aroun...

AI Technical Summary

Problems solved by technology

Although this kind of sensor arrangement realizes three-dimensional imaging, the signal in the area between layers is weak and only relies on the edge effect, so the axial distribution rate is still low, and the axial distribution is uneven, and the error is relatively large. Unable to accurately detect multiphase flow flow axial parameters

[0006] It can be seen that the existing ECT three-dimensional sensors can only perform imaging in subsections. Strictly speaking, they belong to 2.5D images, which require a large number of electrode plates, greatly increase the dimension of detection data, increase costs, and post-processing time growth, real-time performance decreases, and computer storage data capacity increases

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