A gel conductivity measurement method based on electrical impedance imaging

Abstract

The invention relates to a gel conductivity measurement method based on electrical impedance imaging, comprising the following steps: 1) placing the gel in an electrical impedance experiment tank filled with a conductive solution; 2) using an electrical impedance imaging data acquisition system to conduct current Excitation and voltage acquisition, and use the sensitivity algorithm to reconstruct the conductivity image; 3) According to the obtained imaging results, judge whether the conductivity of the gel is equal to the conductivity of the solution, if not, perform step 4), otherwise, through the liquid conductivity Measure the conductivity of the solution with a rate meter to obtain the conductivity of the gel; 4) adjust the conductivity of the solution and return to step 3). Compared with the prior art, the present invention has the ability to conveniently measure the conductivity value of the gel under the excitation of a certain frequency current as long as the conductivity distribution of the gel is uniform and the measuring electrode is not in contact with the gel. advantage.

Description

technical field [0001] The invention relates to a gel conductivity measurement method, in particular to a gel conductivity measurement method based on electrical impedance imaging. Background technique [0002] At present, the general technique for laboratory gel measurement is to use an impedance analyzer to measure the resistance value R of the gel, and then use a length measurement tool to measure the shape parameters of the gel, such as the bottom diameter d and height h of the cylindrical gel, etc. Then use the following mathematical formula to calculate the resistivity of the gel, and calculate the reciprocal to obtain the gel conductivity σ. Take a cylindrical gel as an example: [0003] R = ρ · L S [0004] ρ = R · S L = R · ...

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the shortcomings that direct measurement technology cannot measure irregularly shaped gels, cannot verify the uniformity of gel conductivity and is affected by factors such as contact impedance, the present invention provides a gel conductivity measurement method based on electrical impedance imaging , for a gel of any shape, as long as its conductivity distribution is uniform and the measuring electrode is not in contact with the gel, the conductivity value of the gel under a certain frequency of current excitation can be easily measured

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