A non-contact conductance measuring device based on double-excitation capacitor compensation

By employing a dual-excitation capacitor compensation method, differential modules and operational amplifiers are used to eliminate coupling capacitor interference, thus solving the problems of circuit stability and dynamic performance in non-contact conductivity detection technology and realizing efficient conductivity measurement in water electrolysis and fluid boiling scenarios.

CN122150682BActive Publication Date: 2026-07-24ZHEJIANG FORESTRY UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHEJIANG FORESTRY UNIVERSITY
Filing Date
2026-05-07
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing non-contact conductivity detection technologies, while eliminating coupling capacitance, cannot guarantee circuit stability, and the frequency adjustment process sacrifices the dynamic performance of the sensor, limiting its application in scenarios such as water electrolysis and fluid boiling.

Method used

A dual-excitation capacitor compensation method is adopted, which uses excitation signals with a 90-degree phase difference between the excitation voltages generated by two AC excitation sources. Combined with a differential module and an operational amplifier, the interference of coupling capacitors on the measurement is eliminated, ensuring circuit stability.

Benefits of technology

It achieves complete elimination of the influence of coupling capacitance on measurement while ensuring circuit stability, thereby improving measurement accuracy and response speed. It is suitable for scenarios such as water electrolysis and fluid boiling.

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Abstract

The application belongs to the technical field of conductance measurement, and provides a non-contact conductance measurement device based on double-excitation capacitance compensation, which comprises a first AC excitation source, a second AC excitation source, a measured flow channel with an insulating pipe wall, an impedance detection module, a differential module and an AC effective value detection module, one end of the first AC excitation source is grounded, one end of the second AC excitation source is grounded, the measured flow channel is provided with a first electrode and a second electrode at intervals along the length direction, the input end of the impedance detection module is connected with the other end of the first AC excitation source and the first electrode of the measured flow channel respectively, the output end is connected with the second electrode of the measured flow channel, the same-phase input end of the differential module is connected with the other end of the second AC excitation source, the opposite-phase input end is connected with the output end of the impedance detection module, and the AC effective value detection module is connected with the output end of the differential module. The application can eliminate the interference of coupling capacitance on measurement under the premise of ensuring the stability of the circuit.
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