A non-contact electrical impedance tomography device and method
A tomography, non-contact technology, applied in the direction of material resistance, etc., can solve the problems of imaging effect and parameter measurement performance constraints, incomplete information extraction of gas-liquid two-phase flow characteristics and other problems
Active Publication Date: 2020-06-05
ZHEJIANG UNIV
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Problems solved by technology
The existing ERT system ignores the imaginary part information of gas-liquid two-phase flow electrical impedance, which will inevitably lead to incomplete extraction of flow characteristic information of gas-liquid two-phase flow, and the corresponding imaging effect and parameter measurement performance will be restricted
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[0096] Such as figure 1 As shown, N pieces of metal electrodes are installed on the outer wall of the insulated measuring pipe 1 to form a non-contact array electrical impedance sensor 2. Each piece of metal electrode is connected to the corresponding excitation and detection unit 3 through a metal wire. N groups of excitation and detection units 3 and the signal processing and data acquisition unit 4 are connected through a flexible cable, and the signal processing and data acquisition unit 4 is connected with the image reconstruction computer 5 through a universal serial bus (USB) data line.
[0097] Such as figure 2 As shown, the signal processing and communication module is composed of DSP, FPGA, DAC, ADC and USB communication module. The DSP chip is the control core of the entire module, controlling the working process and data communication of the entire signal processing and communication module; the FPGA chip is responsible for generating excitation signals, sending ...
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Abstract
The invention discloses a noncontact-type electric impedance chromatographic imaging apparatus and method. The noncontact-type electric impedance chromatographic imaging apparatus comprises an insulation measurement pipeline, a contact array-type electric impedance sensor, an excitation and detection unit, a signal processing and data acquisition unit and an image reconstruction computer, whereineach metal electrode in the noncontact array-type electric impedance sensor is connected with the corresponding excitation and detection unit by virtue of a conducting wire, the excitation and detection unit is connected with the signal processing and data acquisition unit by virtue of a flexible flat cable, and the signal processing and data acquisition unit is connected with the image reconstruction computer by virtue of a universal serial bus (USB). By adopting the noncontact-type electric impedance chromatographic imaging apparatus and method, the defects of electrochemical corrosion and electrode polarization caused by the contact-type measurement can be effectively overcome, and the measurement performance of the system can be improved. Meanwhile, the invention can also perform the image reconstruction by acquiring complete electric impedance (a real part, a virtual part and an amplitude value of the electric impedance) of gas and liquid fluid in a pipeline, and by combining theinformation fusion and data mining technology, the image reconstruction quality can be effectively improved.
Description
technical field [0001] The invention relates to a two-phase flow fluid detection technology, in particular to a non-contact electrical impedance imaging device and method. Background technique [0002] Gas-liquid two-phase flow has a very wide and important application in many industrial fields such as petrochemical, energy, power, aerospace, environmental protection and military industry. Dynamic monitoring of its flow process is of great significance to the mechanism research of gas-liquid two-phase flow and the reliable operation of corresponding industrial application systems, energy saving and efficiency enhancement, quality control and automation level improvement. [0003] Electrical resistance tomography (Electrical Resistance Tomography, ERT) is an important electrical process imaging technique. Based on the resistance / conductance sensing mechanism, this technology can non-invasively obtain the two-dimensional / three-dimensional spatial distribution information of t...
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IPC IPC(8): G01N27/06G01N27/04
CPCG01N27/04G01N27/06
Inventor 黄志尧王宇鑫王保良冀海峰李海青
Owner ZHEJIANG UNIV