Electrical impedance tomography-based gel conductivity measurement method

A technology of electrical impedance imaging and measurement method, applied in the direction of measuring resistance/reactance/impedance, measuring device, measuring electrical variables, etc., can solve problems such as the inability to verify the uniformity of the conductivity of the gel, and the inability to measure the irregular shape of the gel. , to achieve the effect of low cost, easy operation and high precision

Active Publication Date: 2014-03-12
索菲亚医疗科技(启东)有限公司
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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 measuremen...

Method used

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  • Electrical impedance tomography-based gel conductivity measurement method
  • Electrical impedance tomography-based gel conductivity measurement method
  • Electrical impedance tomography-based gel conductivity measurement method

Examples

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Embodiment

[0041] In many electrical impedance experiments, gels of a certain shape need to be used to simulate human organs for experiments, and it is often required to accurately measure the conductivity of gels of different shapes.

[0042] Taking a cylindrical gel with a bottom diameter of 5cm and a height of 8cm with uniform conductivity distribution as an example, cut the bottom surface of the gel flat with a thin scalpel so that the gel can be placed flat in a large sink with a diameter of 30cm. The height range of the electrode surface is 1.6-4.1cm; add tap water with a certain conductivity to the sink to make it submerge the electrode plane, carefully place the gel on a position close to the electrode sheet, and the center of the bottom surface of the cylinder is 5cm away from the electrode sheet. Cut the gel or add pads under the gel, adjust the height of the cross-section to be measured so that it coincides horizontally with the electrode plane, and place the gel with clean too...

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Abstract

The invention relates to an electrical impedance tomography-based gel conductivity measurement method, which comprises the following steps of (1) placing gel into an impedance experiment tank filled with conducting solution; (2) performing current excitation and voltage acquisition by an electrical impedance tomography data acquisition system, and reestablishing a conductivity image utilizing the sensitivity algorithm; (3) according to an obtained imaging result, judging whether the conductivity of the gel is equal to that of the solution, is not, performing the step (4), and otherwise, measuring the conductivity of the solution by a liquid conductivity meter to obtain the conductivity of the gel; (4) adjusting the conductivity of the solution, and returning to the step (3). Compared with the prior art, the electrical impedance tomography-based gel conductivity measurement method has the advantage that the conductivity value of the gel of any shape under the excitation of a current of a certain frequency can be measured conveniently as long as the conductivity is uniformly distributed and measuring electrodes are not in contact with the gel.

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 · ...

Claims

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Application Information

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IPC IPC(8): G01R27/14
Inventor 马艺馨王若帆
Owner 索菲亚医疗科技(启东)有限公司
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