Capacitance/image method and volume field imaging sensor

Abstract

The invention discloses a capacitor / image-method same-volume field imaging sensor. The imaging sensor comprises a capacitor tomography sensor and a measuring pipeline. The capacitor tomography sensor comprises a shielding case and a measuring electrode arranged outside the measuring pipeline, wherein the two ends of the measuring electrode are respectively provided with an end shield along the axial direction; the end shields, the measuring electrode and the shielding case are in a porous net-shaped structure; and the measuring pipeline is made from a light-transmitting glass material. Compared with the prior art, the imaging sensor has the advantages that 'hard field' information of optical images of the same measurement domain is introduced through a light-transmitting sensor, the amount of the measured information can be increased, and the measurement of the same volume field is realized; and by complementation and modification of axial and cross-section information, the detection accuracy is improved, the measurement range is expanded and imaging can be realized for both dilute phase and dense phase.

Description

technical field [0001] The invention relates to a process imaging technology, in particular to a capacitance tomography sensor. Background technique [0002] Electrical Capacitance Tomography (ECT) is a new detection technology developed in the late 1980s. Its principle is to rely on a set of capacitance plates surrounding the measured area to obtain the capacitance between different electrode pairs, and then pass through The data acquisition device is passed to the computer, and finally the image reconstruction is realized by the computer. Because it can measure the material distribution on the entire cross-section, and it is cheap and fast, it has been widely used in pneumatic conveying, circulating fluidized bed, gas-liquid flow and other two-phase flow detection in recent years. [0003] Although ECT is widely used in the measurement of various two-phase flows, due to the traditional electrical capacitance tomography sensor, the measuring electrodes are often arranged o...

AI Technical Summary

Problems solved by technology

This traditional arrangement has the following problems. First, the axial length of the ECT measurement electrode is usually long, and the ECT reconstruction image is only a cross-sectional image of the pipeline, which cannot reflect the axial distribution information of the measurement area; secondly, the measurement electrode and shielding The covers all adopt a closed structure, which covers the measurement area. As a result, most of the current ECT and other optical methods are non-uniform volume field measurements. The measurement fields are not completely the same, and the flow pattern changes rapidly. The flow pattern cannot be guaranteed to be the same, which greatly reduces the accuracy of image reconstruction and parameter measurement

[0004] At the same time, ECT has a "soft field" characteristic, that is, the sensitivity distribution of ECT is affected by the distribution of substances in the measurement area, which affects the accuracy of parameter measurement and image reconstruction, and also makes the current ECT poor for low-concentration gas-solid two-phase flow measurement.

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