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A Reconstruction Method of Conductivity Distribution in Electrical Resistance Tomography with Suppressed Staircase Effect

A technology of resistance tomography and step effect, which is applied in the direction of measuring resistance/reactance/impedance, material impedance, measuring electrical variables, etc., can solve problems such as the step effect of the full variation regularization method, so as to reduce the step effect and suppress the step effect, effect with obvious advantages

Active Publication Date: 2021-06-04
HENAN NORMAL UNIV
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Problems solved by technology

However, the fully variational regularization method produces a severe staircase effect

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  • A Reconstruction Method of Conductivity Distribution in Electrical Resistance Tomography with Suppressed Staircase Effect
  • A Reconstruction Method of Conductivity Distribution in Electrical Resistance Tomography with Suppressed Staircase Effect
  • A Reconstruction Method of Conductivity Distribution in Electrical Resistance Tomography with Suppressed Staircase Effect

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Embodiment Construction

[0027] A method of electrical resistance tomography electrical conductivity distribution reconstruction for suppressing the ladder effect of the present invention is described in detail in conjunction with the accompanying drawings.

[0028] The present invention aims at the problem of serious step effect in the image reconstructed by the full variation regularization method, and adds a second order derivative term on the basis that the regularization term of the original full variation regularization method is the first order derivative term. to suppress the ladder effect. According to the reconstruction model of different edges, the weight between the first-order derivative item and the second-order derivative item is controlled by adjusting the weight factor.

[0029] Such as figure 1 As shown, it is a flow chart of a method for electrical resistance tomography electrical conductivity distribution reconstruction that suppresses the ladder effect in the present invention. ...

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Abstract

The invention discloses a method for reconstructing the electrical conductivity distribution of resistive tomography imaging by suppressing the staircase effect, which is used for the resistive tomography of discontinuous medium. The method treats the ill-posed inverse problem of the resistive tomography as a linear problem for solving , and determine the objective function; the reconstruction method is: according to the measured field, obtain the boundary measurement voltage and sensitivity matrix required for reconstruction; convert the nonlinear resistance tomography inverse problem into a linear problem to solve; determine the objective function, and convert the target The function is minimized to find its optimal solution; the dual form of the objective function is derived; the solution is updated using the original-dual algorithm; The new method proposed by the invention effectively suppresses the staircase effect of the reconstructed image in the reconstruction of the tested model, retains the sharp edge of the image, and greatly improves the quality of the reconstructed image.

Description

technical field [0001] The invention belongs to the technical field of electrical tomography, and in particular relates to a method for reconstructing electrical conductivity distribution of electrical resistance tomography that suppresses the step effect. Background technique [0002] Electrical tomography (Electrical Tomography, ET) appeared in the late 1980s. It is a process tomography technology based on the sensitive mechanism of electrical characteristics. It obtains the distribution information of the medium in the measured area through the boundary measurement value, and then Imaging of electrical property distribution information. Electrical tomography technology mainly includes electrical resistance tomography (Electrical Resistance Tomography, ERT), electrical impedance tomography (Electrical Impedance Tomography, EIT), electrical capacitance tomography (Electrical Capacitance Tomography, ECT) and electromagnetic tomography (Electrical Magnetic Tomography, EMT). ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/02G01N27/02
CPCG01N27/02G01R27/02
Inventor 施艳艳张旭王萌
Owner HENAN NORMAL UNIV
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