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Three-dimensional variational method for multimode fusion of capacitance and ultrasonic tomography

An ultrasonic tomography and capacitance tomography technology, applied in the field of multiphase flow measurement, can solve problems such as poor resolution, limited spatial resolution, and sensitivity to phase boundaries, and achieve enhanced imaging quality, improved overall resolution, The effect of improving reconstruction accuracy

Inactive Publication Date: 2018-07-06
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

UCT produces an image of the slowness distribution, and the obtained image has artifacts, but UCT is sensitive to phase boundaries
Both have limited spatial resolution in practice
In industrial real-time applications, the number of observations is severely limited due to geometric and time constraints
Sparse matrices lead to poor resolution if no prior information is known

Method used

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  • Three-dimensional variational method for multimode fusion of capacitance and ultrasonic tomography
  • Three-dimensional variational method for multimode fusion of capacitance and ultrasonic tomography
  • Three-dimensional variational method for multimode fusion of capacitance and ultrasonic tomography

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The 12-electrode sensor structure used in electrical capacitance tomography (ECT) is as follows: figure 1 As shown, the structure of 12 ultrasonic transducers used in ultrasonic tomography (UCT) is as follows figure 2 As shown, the joint arrangement structure of capacitance and ultrasonic sensor used in the method proposed in Embodiment 1 of the present invention is as follows image 3 shown.

[0042] Taking a single bubble as the experimental object, the original simulated distribution of the single bubble is as follows Figure 4 As shown in a, the black part in the figure represents air, and the white part represents oil.

[0043] 1) Image reconstruction by electrical capacitance tomography (ECT)

[0044] The reconstruction algorithm uses the result calculated by the linear back-projection method as the initial value, and the Landweber iterative method reconstructs the distribution image.

[0045] G (0) = S T C (1)

[0046] G (k+1) =G (k) +α (k) S T (C-SG ...

Embodiment 2

[0064] Taking the double bubble as the experimental object, the original distribution image is simulated as Figure 5 as shown in a. The black part in the figure represents air, and the white part represents oil, and the calculation process is similar to that of Example 1.

[0065] 1) Image reconstruction by electrical capacitance tomography (ECT)

[0066] The reconstruction algorithm uses linear back projection as the initial value, the Landweber iterative method reconstructs the distribution image, and the double bubble image reconstructed by electrical capacitance tomography is as follows: Figure 5 as shown in b.

[0067] 2) Ultrasound tomography reconstruction image (UCT)

[0068] Ultrasound tomography adopts algebraic reconstruction technique (ART) to obtain the distribution image, and the double bubble image reconstructed by ultrasonic tomography is as follows: Figure 5 as shown in c.

[0069] 3) The method proposed by the present invention

[0070] The result ve...

Embodiment 3

[0074] Taking three bubbles as the experimental object, simulate the original distribution image as Image 6 as shown in a. The black part in the figure represents air, and the white part represents oil. The calculation process is similar to Example 1.

[0075] 1) Image reconstruction by electrical capacitance tomography (ECT)

[0076] The reconstruction algorithm uses linear back projection as the initial value, and the Landweber iterative method reconstructs the distribution image. The three-bubble image reconstructed by electrical capacitance tomography is as follows: Image 6 as shown in b.

[0077] 2) Ultrasound tomography reconstruction image (UCT)

[0078] Ultrasound tomography adopts algebraic reconstruction technique (ART) to obtain the distribution image, and the three-bubble image reconstructed by ultrasonic tomography is as follows: Image 6 as shown in c.

[0079] 3) The method proposed by the present invention

[0080] The result vector G obtained by ECT u...

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Abstract

The invention belongs to the technical field of multiphase flow measurement, in particular relates to a three-dimensional variational method for multimode fusion of capacitance and ultrasonic tomography. The method comprises using a capacitance tomography method for a two-phase fluid to obtain a calculation result, and using the calculation result as a background field to establish a posterior state probability distribution function by combination of observation data; on the basis of assuming that the probability distribution functions of the observation data and the background field both obeyGaussian distribution, calculating the posterior state probability distribution function under the assumption conditions of the Gaussian distribution, using the three-dimensional variational method to obtain an objective function, and combining different weights of a background field error and an observation field error to obtain the objective function considering the weights; and using a conjugate gradient method to solve the objective function considering the weights to obtain an optimal state estimation value. The three-dimensional variational method is used for fusion of the capacitance and the ultrasonic tomography, and combines the advantages of the two tomographic techniques to improve the overall resolution of image reconstruction.

Description

technical field [0001] The invention belongs to the technical field of multiphase flow measurement, and in particular relates to a three-dimensional variational method for multimodal fusion of capacitance and ultrasonic tomography. Background technique [0002] Electrical Capacitance Tomography (ECT) is a new multiphase flow measurement method that has developed rapidly since the 1980s. The principle is to rely on a group of electrode plates surrounding the measured area to detect the capacitance change caused by the change of the substance concentration distribution in the area, and use the image reconstruction algorithm to reproduce the distribution state of the multiphase fluid in a certain section of the pipeline. Because of its advantages of non-interference, non-invasive, fast, cheap, non-radioactive, and visualization, it has been widely used in gas / oil, water / oil, gas / solid and other two-phase flow measurements in recent years. [0003] Ultrasonic Computed Tomograph...

Claims

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Application Information

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IPC IPC(8): G01N27/22G01N29/02G01N29/44
CPCG01N27/22G01N29/02G01N29/44
Inventor 李艳秋刘石
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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