Capacitor coupling noncontact conductance measurement device and method

A non-contact conductance and capacitive coupling technology, applied in the direction of fluid resistance measurement, material resistance, etc., can solve problems such as instability and complex structure, achieve stable performance, expand the measurement range, and simplify the circuit

Active Publication Date: 2016-02-24
ZHEJIANG UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the virtual inductance involved in this patent is a floating inductance with a relatively complex structure and a certain degree of instability in the conductance measurement process

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  • Capacitor coupling noncontact conductance measurement device and method
  • Capacitor coupling noncontact conductance measurement device and method
  • Capacitor coupling noncontact conductance measurement device and method

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Embodiment Construction

[0026] The present invention will be further elaborated and illustrated below in conjunction with the accompanying drawings and embodiments. The technical features of the various implementations in the present invention can be combined accordingly on the premise that there is no conflict with each other.

[0027] Such as figure 1 As shown, a capacitively coupled non-contact conductivity measurement device is characterized in that it includes an AC excitation source 1, an insulating measurement pipeline 2, an excitation electrode 3, a detection electrode 4, a range resistance 5, a virtual inductance 6, a differential amplification module 7, and a signal The processing module 8; the excitation electrode 3 and the detection electrode 4 are installed on the outer wall of the insulating measurement pipeline 2, the AC excitation source 1 is connected to the excitation electrode 3, the detection electrode 4, the range resistance 5, and the virtual inductance 6 are connected in sequen...

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Abstract

The invention discloses a capacitor coupling noncontact conductance measurement device and method. The device comprises an alternating-current excitation source, an insulated measurement pipeline, an excitation electrode, a detection electrode, a range resistor, a virtual inductor, a differential amplifier module and a signal processing module, wherein one end of the virtual inductor is connected with the range resistor, while the other end is grounded, meanwhile, two ends of the range resistor are connected with the differential amplifier module. The virtual inductor substitutes an actual inductor, thus effectively overcoming the adverse effect of a coupled capacitor on the measurement result according to the series resonance principle. The virtual inductor is a grounding inductor, and compared with a floating inductor, the virtual inductor is good in working stability and simple in circuit structure; compared with an actual inductor, the virtual inductor capable of adjusting the equivalent inductance value reduces the requirement for the frequency of the excitation source. In addition, different from a noncontact conductance measurement method adopting a current method, the capacitor coupling noncontact conductance measurement method adopts a voltage method to obtain the equivalent conductance value of measured conductive fluid, thus providing helpful reference for solving the conductance measurement problem of conductive fluid in a pipeline.

Description

technical field [0001] The invention relates to conductance detection technology, in particular to a capacitively coupled non-contact conductance measurement device and method. Background technique [0002] Many properties of liquids, such as changes in liquid composition, fluctuations in concentration, and changes in chemical reaction rates, can be indicated by changes in conductivity. Since the conductivity has the characteristics of reflecting the difference in the physical and chemical properties of the liquid, the measurement of the conductivity of the liquid is of great significance to both scientific research and industrial production. [0003] The existing conductometric detection methods are mainly contact conductometric detection methods. Because the electrodes are directly in contact with the liquid to be measured, problems such as electrode polarization and electrochemical corrosion are prone to occur, so the application of contact conductometric detection method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/22G01N27/06
CPCG01N27/06G01R27/22
Inventor 吕颖超冀海峰王保良黄志尧李海青
Owner ZHEJIANG UNIV
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