Electric capacitance tomography method based on improved particle swarm optimization

A technology of capacitance tomography and improved particle swarm, applied in material capacitance, 2D image generation, material analysis by electromagnetic means, etc., can solve problems such as poor imaging quality, achieve good imaging effect, strong global search ability, The effect of solving soft field and ill-conditioned problems

Inactive Publication Date: 2018-09-28
NORTHWEST NORMAL UNIVERSITY
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Problems solved by technology

[0004] The purpose of the present invention is to provide an electrical capacitance tomography method based on improved particle swarm optimization, to solve the problem of poor imaging quality caused by "soft field" and pathological problems in the image reconstruction of CET

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  • Electric capacitance tomography method based on improved particle swarm optimization
  • Electric capacitance tomography method based on improved particle swarm optimization
  • Electric capacitance tomography method based on improved particle swarm optimization

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[0038] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0039] Electrical capacitance tomography technology obtains the dielectric constant distribution in the measured object field according to the capacitance value between the electrodes by placing an electrode array around the measured object field and applying a voltage. Theoretically, ECT image reconstruction belongs to the process of solving the distribution vector of permittivity. According to the electromagnetic field theory, the electrostatic field in the measured field satisfies the Laplace equation after the voltage is applied:

[0040]

[0041] (1) where, ε is the relative permittivity; φ is the potential; the boundary conditions of (1) are:

[0042]

[0043] (2) In the formula, U is the boundary excitation voltage; Γ i for the electrode i location in space; Γ s is the position of the shielding layer; Γ g for the po...

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Abstract

The invention discloses an electric capacitance tomography method based on improved particle swarm optimization. The method comprises applying voltage so that the electrostatic field in the measured field satisfies the Laplace equation, carrying out taylor expansion on the capacitance value between the electrodes and the relative dielectric constant relationship, ignoring the high order phase, carrying out normalization processing to obtain a normalized capacitance vector, reconstructing the electric capacitance tomography images to optimize a target, acquiring an objective function of the Landweber algorithm according to the vector norm function definition, rebuilding an iterative formula of the electric capacitance tomography according to the steepest descent principle, improving the rebuilding quality through a particle swarm optimized fitness function, acquiring a modified particle velocity update formula through an exponential decay weight mechanism, and optimizing the data. The electric capacitance tomography method utilizes the inertia weight exponential decay particle swarm optimization algorithm to optimize the rebuilding result obtained by the Landweber algorithm, solvesthe problem in the Landweber imaging process and reduces the influence caused by a soft field on the image reconstruction.

Description

technical field [0001] The invention belongs to the technical field of electrical capacitance tomography, and relates to an electrical capacitance tomography method based on improved particle swarm optimization. Background technique [0002] Electrical capacitance tomography (ECT) is a process imaging technique for multiphase flow detection that is non-invasive, fast in response, and low in cost. The ECT system consists of capacitive sensors, a data acquisition system, and a computer for image reconstruction. The data measured by the sensor system is obtained by the acquisition system and sent to the computer to reconstruct the material distribution of the measured object field through the reconstruction algorithm. The physical process of capacitance measurement is based on the relationship between electric field and dielectric constant. Electric capacitance tomography technology is based on the fact that each phase of the measured substance has different dielectric consta...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/22G06T11/00
CPCG01N27/221G06T11/003G06T2211/424
Inventor 严春满陆根源张道亮董俊松
Owner NORTHWEST NORMAL UNIVERSITY
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