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Method for measuring solution conductivity of closed decoupled capacitance-resistance network excited by triangular wave

A technology of resistance-capacitance network and measurement method, applied in the direction of material resistance, etc., can solve problems such as affecting real-time processing, affecting calculation accuracy, increasing calculation amount, etc., to achieve the effect of simple measurement and calculation method, simple excitation signal, and less calculation amount

Active Publication Date: 2014-06-25
FUJIAN NORMAL UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Commonly used methods include phase-sensitive detection method, double-pulse method, and dynamic pulse method. All methods are finally converted to decoupling the resistance-capacitance network of the conductivity cell model. Some calculation methods require iterative processing to increase the amount of calculation and affect real-time Processing or affecting calculation accuracy

Method used

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  • Method for measuring solution conductivity of closed decoupled capacitance-resistance network excited by triangular wave
  • Method for measuring solution conductivity of closed decoupled capacitance-resistance network excited by triangular wave
  • Method for measuring solution conductivity of closed decoupled capacitance-resistance network excited by triangular wave

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Embodiment 1

[0088] Based on the above principles of the invention, a method for measuring the conductivity of a solution of a closed decoupling RC network excited by a triangular wave is obtained, which includes the following steps:

[0089] Put the electrode into the solution to be tested, and use an AC symmetrical triangular wave signal with a voltage amplitude of U and a period of 2T to excite the electrode. 1 , t 2 , t 3 Sampling the current signal of the electrode response, set the three current sampling values ​​as i 1 , i 2 and i 3 , use the following formula to obtain the resistance value R of the solution to be measured x .

[0090] R x = | U ( i 2 - i 1 ) ( i ...

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Abstract

The invention discloses a method for measuring solution conductivity of a closed decoupled capacitance-resistance network excited by triangular wave. The method comprises exciting electrodes by using a voltage signal of an AC symmetrical triangular wave having an amplitude value of U and a fixed period; sampling electrode-responded current signals i1, i2, and i3 at three quartering times of an upper wave band or a lower wave band of the triangular wave; calculating a resistance value Rx of the solution using the following formula shown in the description; and obtaining the conductivity using G=K / Rx, K being an electrode constant. The method can completely eliminate impact of distribution capacitance and electrode polarized capacitance on measurement, has no special requirements for frequency of excitation signals, can randomly select within a relatively wide range, and can meet requirements of low conductivity and high conductivity for measuring.

Description

technical field [0001] The invention relates to a measuring method of solution conductivity or resistivity, in particular to a measuring method which adopts triangular wave as excitation signal and can completely eliminate the influence of electrode electric double layer capacitance and electrode distributed capacitance on solution conductivity or resistivity measurement. Background technique [0002] The basic measure of the conductivity of a solution is to measure the voltage U applied across the electrodes placed in the solution D and the current I flowing through the electrodes, calculate the resistance R=U between the electrodes D / I, calculate the conductivity of the solution with G=K / R, where K is the cell constant. However, the electrode placed in the solution will be polarized after being energized, making the measured voltage U D In essence, it is not the voltage across the solution itself, but the voltage applied to the two virtual electronic devices connected i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/06
Inventor 廖晓东郑华吴庆祥
Owner FUJIAN NORMAL UNIV
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