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Capacity coupling non-contact conductance measuring device based on series resonance and method

A non-contact conductance and series resonance technology, which is applied in the direction of measuring devices, measuring electrical variables, measuring resistance/reactance/impedance, etc., can solve problems such as low resolution, small conductivity range, and unsuitable measurement of high-concentration solutions

Inactive Publication Date: 2009-03-18
ZHEJIANG UNIV
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  • Application Information

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Problems solved by technology

[0005] Due to the influence of coupling capacitance and parasitic capacitance, the existing capacitively coupled non-contact conductivity device can measure the conductivity in a small range and the resolution is not high, so it is not suitable for the measurement of the conductivity of solutions with high concentration

Method used

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  • Capacity coupling non-contact conductance measuring device based on series resonance and method
  • Capacity coupling non-contact conductance measuring device based on series resonance and method
  • Capacity coupling non-contact conductance measuring device based on series resonance and method

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Embodiment Construction

[0032] Such as figure 1 As shown, the capacitively coupled non-contact conductivity measurement device based on series resonance includes a conductivity sensor, a signal generator, an inductance module, a rectification filter circuit, a data acquisition module, and a computer. Metal shielding layer, the excitation electrode and detection electrode are installed on the outer wall of the insulated measuring pipe, and the periphery of the detection electrode is provided with a metal shielding layer. Modules and computers are connected. The wires between the excitation electrodes and the inductance module, and the wires between the inductance module and the signal generator adopt shielded wires.

[0033] The process of using the device and method to measure the conductance of the solution is: the frequency of the signal generator outputting the AC voltage is the resonance frequency, the AC voltage is applied to the excitation electrode after passing through the inductor, and the ...

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Abstract

The invention discloses a measurer of capacity coupling type contactless conductivity, based on serial resonance and a method. The measurer comprises a signal generator, an inductor module, an insulated measurement tube, an exciting electrode, a detection electrode, a rectifying filtering circuit, a data acquisition module and a computer, wherein the output of the signal generator excites the exciting electrode via the inductor module, the detection electrode obtains the solution conductivity measurement information in the insulated measurement tube, the rectifying filtering circuit and the data acquisition module convert the information into voltage signals to be transmitted to the computer, and the computer utilizes the one-to-one relationship between voltage and conductivity to obtain the conductivity measurement value of the object liquid. The invention utilizes serial resonance method to effectively eliminate the effect of coupling capacitance and parasitic capacitance on the conductivity measurement and expands the conductivity measurement range. The relative measurer has the advantages of wide measurement range, high sensitivity, simple structure, contactless property and low cost, which provides an effective path for measuring the liquid conductivity in tube.

Description

technical field [0001] The invention relates to conductance detection technology, in particular to a capacitively coupled non-contact conductance measurement device and method based on series resonance. Background technique [0002] The liquid phase system in the pipeline widely exists in the scientific research and production process of metallurgy, chemical industry, medicine, biology and sewage treatment and other departments. The detection of liquid-related physical parameters is of great significance to the scientific research and production of various departments. Among them, Conductivity is one of the basic physical parameters of liquids. The detection of conductivity plays an important role in analyzing other characteristic parameters of liquids in pipelines, such as concentration, liquid components, and chemical reaction rates. It is precisely because many differences in physical and chemical properties of liquids will be reflected in changes in their electrical cond...

Claims

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Application Information

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IPC IPC(8): G01N27/08G01R27/02
Inventor 黄志尧周鑫淼姜娓娓何潮洪冀海峰王保良李海青
Owner ZHEJIANG UNIV
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