Contactless integrated capacitance/resistance dual-mode tomography measurement apparatus and method

Abstract

The invention discloses a contactless integrated capacitance / resistance dual-mode tomography measurement apparatus and a method. The apparatus comprises a sensor, a data acquisition module and an image reconstruction computer, wherein the sensor, the data acquisition module and the image reconstruction computer are connected, the sensor comprises an insulation pipeline and rectangular metal electrodes surrounded on the outer surface of the insulation pipeline at intervals, the data acquisition module comprises a direct digital frequency synthesizer (DDS) unit, a phase sensitive demodulation (PSD) unit, and a control and communication unit, every PSD unit is respectively connected with the corresponding rectangular metal electrode, and any one PSD unit is connected with the DDS unit, is connected with the other PSD units in parallel through arrangement wires, and then is connected with the control and communication unit. According to the present invention, the sensor integration is adopted to ensure consistency of the measurement space, the data acquisition module integration is adopted to ensure consistency of the measurement time, and problems of electrode polarization and corrosion of the traditional contact type measurement are effectively overcome with the contactless measurement.

Description

technical field [0001] The invention relates to the technical field of detection, in particular to a non-contact integrated capacitance / resistance dual-mode tomography measuring device and method. Background technique [0002] Electrical Capacitance Tomography (abbreviated as ECT) and electrical resistance tomography (abbreviated as ERT) are two relatively mature electrical tomography technologies in the field of process tomography. These two technologies are suitable for different application ranges in the field of multiphase flow detection. ECT is suitable for the measurement where the continuous phase is a non-conductive medium, and ERT is suitable for the measurement where the continuous phase is a conductive medium. Due to the complexity and changeability of multiphase flow, there is often the problem of continuous phase conversion. For example, in oil-water two-phase flow, when more oil is used as the continuous phase and less water is used as the discrete phase, ECT s...

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Problems solved by technology

[0003] The existing ECT / ERT dual-mode system often combines two independent ECT and ERT devices, and the sensor electrodes of ECT and ERT are respectively installed in different sections of the same pipeline, or the electrodes of ECT and ERT are combined into a composite electrode first Then install it on the inner and outer surfaces of the pipeline, and the data acquisition modules of different modes need to be designed separately based on different measurement principles. Alternate work, these dual-mode systems often have the following disadvantages: 1) The separate design of the sensor electrodes makes it difficult to ensure the consistency of the measurement space, and the alternate work of the data acquisition module makes it difficult to ensure the consistency of the measurement time, so the two modes It is difficult to guarantee the temporal and spatial consistency of the measurement between states; 2) The electrode of the ERT is in contact with the fluid in the tube, which is prone to electrode polarization and electrochemical corrosion. Application in the industrial production process of liquid; 3) Different sensor electrodes and data acquisition modules need to be designed for the two modes of ECT and ERT, and the system structure is more complicated

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