ECT-based dual-array sensor system with adjustable duty ratio

Abstract

The invention relates to an ECT-based dual-array sensor system with an adjustable duty ratio. The system comprises a shielding cover, a plurality of differential electrodes, a plurality of measuring electrodes and an adjustable bracket; the plurality of the measuring electrodes are mounted on the outer side of the outer circumferential surface of a pipeline through adjustable supports in an annular shape at intervals; the plurality of the differential electrodes are mounted on the outer sides of the plurality of the measuring electrodes through adjustable supports; each differential electrodecorresponds to one measuring electrode in position, and the measuring electrodes and the differential electrodes are concentrically arranged; the differential electrodes and the measuring electrodes are sequentially connected with external data acquisition system and imaging system through wires; and the shielding cover is arranged on the outer sides of the differential electrodes. By adding the differential electrodes, the precision can be greatly improved when an effective capacitance value is measured, and can be intuitively reflected from an imaging effect. The application of the ECT system is very wide, so that in a few industrial applications, the differential electrodes are easier to mount than isolated electrodes, the effect of denoising is achieved, and the effect is better than that of the isolated electrodes.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing, in particular to an ECT-based dual-array sensor system with adjustable duty cycle. Background technique [0002] In the pipelines used in industrial fields such as petroleum, chemical industry, metallurgy, electric power, energy and environmental monitoring, there are a large number of two-phase or multi-phase mixed flow substances, and generally it is necessary to obtain the concentration distribution of each phase of the multi-phase flow, multi-phase Parameters such as the flow rate and flow rate of the phase flow, and these parameters are used as reference quantities for real-time monitoring. At present, electrical capacitance tomography (ECT) technology has been applied in these fields, and achieved good results. According to the measurement principle of sensitive devices, process tomography can be divided into: acoustic ET system, nuclear magnetic resonance PT, electrical ET...

AI Technical Summary

Problems solved by technology

However, traditional ECT sensor systems are single-layer electrodes. In practical industrial applications, the current technology cannot embed isolated electrodes into insulating pipes, and embedding them into insulating pipes will also affect the service life and quality of the pipes.

[0006] In the traditional ECT sensor system, the measuring electrodes are fixed on the pipe wall. Since the distance from the measuring electrode to the center of the pipe is fixed, the duty cycle (EGR) is also constant, so the position of the measured substance in the pipe Different, the size is different because it is impossible to choose the appropriate duty cycle, so that the reconstruction image with better effect cannot be obtained, so it is necessary to design a new type of sensor system that can adjust the optimal duty cycle for different flow patterns

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