Electrostatic interference preventing capacitance measuring circuit and method

A capacitance measurement and anti-static technology, used in the measurement of electrical variables, resistance/reactance/impedance, measurement devices, etc., can solve the problem of being affected by particle charging, and achieve the effect of ensuring reliability and accuracy

Active Publication Date: 2015-05-06
SOUTHEAST UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method to prevent electrostatic interference and improve measurement reliability and accuracy in view of the problem that the measureme...

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  • Electrostatic interference preventing capacitance measuring circuit and method
  • Electrostatic interference preventing capacitance measuring circuit and method
  • Electrostatic interference preventing capacitance measuring circuit and method

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Embodiment Construction

[0016] Combine below figure 1 , the present invention is described in detail. Such as figure 1 As shown, the measurement circuit of the present invention mainly includes two direct digital synthesizer (DDS) signal generators, a capacitor voltage conversion module, a band-pass filter, a signal amplifier, an analog multiplier and a low-pass filter. The capacitive voltage conversion module includes a capacitive sensor and a conversion module. The two electrodes of the capacitive sensor are the excitation electrode and the detection electrode respectively, the electrode connected to the output of the DDS signal generator 1 is the excitation electrode, and the other is the detection electrode. The conversion module includes an operational amplifier, a capacitor and a resistor, the capacitor and the resistor are connected in series between the reverse input terminal and the output terminal of the operational amplifier, and the detection electrode of the capacitance sensor is conne...

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Abstract

The invention discloses electrostatic interference preventing capacitance measuring circuit and method. The measuring circuit comprises a first signal generator, a second signal generator, a capacitance and voltage conversion module, a band-pass filter, a signal amplifier, an analog multiplier and a low-pass filter; the capacitance and voltage conversion module comprises a capacitance sensor, and a converting module for converting the capacitance detected by the capacitance sensor into voltage; the first signal generator is connected with an exciting electrode of the capacitance sensor; the band-pass filter, the signal amplifier, the analog multiplier and the low-pass filter are sequentially connected in series with the output end of the conversion module; the second signal generator is connected to another signal input port of the analog multiplier; an output signal of the second signal generator has the same frequency with the output siganl of the first signal generator, and the phase difference of the two output signals is zero. Compared with the prior art, the circuit has the advantages that the problem of particle charge interference during charge injection, zero drifting and air and solid flowing as the measuring objects can be overcome, and therefore, measurement deviation can be avoided.

Description

technical field [0001] The invention relates to a capacitance measuring circuit, in particular to a measuring circuit and a measuring method capable of preventing electrostatic interference. Background technique [0002] Two-phase flow systems widely exist in industrial fields such as energy, chemical industry, electric power and metallurgy. With the development of modern industry, the requirements for the detection and control of industrial process parameters are getting higher and higher. Accurate measurement of two-phase flow parameters has important practical significance for the safe and efficient operation of industrial processes and environmental protection. The capacitance method has the advantages of non-contact, high reliability and low cost, and has been successfully used in the phase concentration measurement of two-phase flow or multiphase flow. The basic principle is that when the fluid passes through the sensitive electric field formed by the capacitance plate...

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Application Information

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IPC IPC(8): G01R27/26G01N27/22
Inventor 李健许传龙王式民
Owner SOUTHEAST UNIV
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