Non-contact conductivity measuring device based on double shield structure and acceptor resonance and method thereof
A non-contact conductance, series resonance technology, applied in measurement devices, measurement of electrical variables, fluid resistance measurement, etc., can solve the problems of conductance measurement resolution and measurement range limitation, unfavorable conductance measurement, etc., to avoid electrode polarization and electrical resistance. Chemical corrosion, contamination avoidance, easy to implement effects
Inactive Publication Date: 2011-05-18
ZHEJIANG UNIV
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Problems solved by technology
The additional electrical impedance generated by the coupling capacitor is an unfavorable background signal for the conductance measurement, which limits the resolution and measurement range of the conductance measurement.
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[0025] Such as figure 1 , 2 , 3, the non-contact conductance measurement device based on double shielding structure and series resonance includes a signal generator 1, an inductance module 2, an insulating measurement pipeline 3, an excitation electrode 4, a detection electrode 5, a double shielding structure 6, and a rectification and filtering circuit 7 , data acquisition module 8, computer 9, the double shielding structure comprises the metal shielding layer 10 of excitation electrode, the voltage follower 11 and the metal shielding layer 12 of detection electrode, and excitation electrode 4 and detection electrode 5 are installed on the outer wall of insulated measuring pipeline, The periphery of the excitation electrode 4 is provided with a metal shielding layer 10, and the two input ends of the voltage follower 11 are respectively connected with the excitation electrode 4 and its metal shielding layer 10, and the periphery of the detection electrode 5 is provided with a ...
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The invention discloses a non-contact conductivity measuring device based on a double shield structure and an acceptor resonance and a method thereof. The device comprises a signal generator, an inductance module, an insulation measurement pipeline, an exciting electrode, a detection electrode, a double shield structure, a rectifier-filter circuit, a data acquisition module and a computer, wherein, the double shield structure comprises a metal shielding layer of the exciting electrode, a voltage follower and a metal shielding layer of the detection electrode. Through the application of the double shield structure, the effect on a parasitic capacitor is completely eliminated; meanwhile, under a resonant state, the effect on a coupling capacitor formed by electrode-pipe wall-conducting liquid is overcome by adopting the principle that inductive reactance and capacity reactance are cancelled. The method effectively eliminates the effect of the parasitic capacitor and the coupling capacitor, enlarges the conductivity measurement range, and improves the measurement resolution ratio; and the corresponding device has the advantages of wide measuring range, high sensitivity, non contact type and the like, and provides beneficial reference for conductive liquid conductivity measurement in the pipeline.
Description
technical field [0001] The invention relates to conductance detection technology, in particular to a non-contact conductance measurement device and method based on double shielding structure and series resonance. Background technique [0002] Liquid phase systems widely exist in chemical industry, biomedicine, environmental protection and metallurgy and other industrial fields. Conductivity is one of the basic physical parameters of liquids. Therefore, online measurement of liquid conductivity is of great significance to scientific research and production. [0003] The traditional conductivity measurement method is mainly contact measurement. After years of research and development, the contact conductivity measurement method has developed relatively mature and has been widely used. However, the contact conductivity measurement method has problems such as electrode polarization effect and electrochemical corrosion due to the direct contact between the electrode and the measu...
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IPC IPC(8): G01R27/02G01R27/22
Inventor 黄志尧姜娓娓周鑫淼王磊冀海峰王保良李海青
Owner ZHEJIANG UNIV