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Capacitive tomography image reconstruction method based on closed-loop control principle

A technology of capacitance tomography and closed-loop control, which is applied in image data processing, 2D image generation, instruments, etc., can solve the problems of electrode quantity capacitance measurement circuit resolution and sensor accuracy limitation, and achieve the effect of improving quality

Active Publication Date: 2018-10-26
BEIHANG UNIV
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Problems solved by technology

[0006] If the boundary capacitance information is accurately obtained when the number of electrodes is large enough, and the perturbation of the permittivity is relatively small, the Calderon algorithm has a very good reconstruction effect. Sensor accuracy and many other limitations

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  • Capacitive tomography image reconstruction method based on closed-loop control principle
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  • Capacitive tomography image reconstruction method based on closed-loop control principle

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Embodiment Construction

[0033] See attached figure 1 , an implementation flowchart of an electrical capacitance tomography image reconstruction method based on the principle of closed-loop control. Combined figure 2 The 16-electrode capacitance tomography sensor shown with its attached image 3 The original model shown illustrates the algorithm.

[0034] Step 1. For example figure 2 The electrical capacitance tomography sensor with 16 electrodes uniformly distributed on the same circular cross-section as shown, for example, image 3 The original distribution shown is measured, in which the relative permittivity of the white part is 3, and the relative permittivity of the black part is 1, and the 16 electrodes are labeled as j (1≤j≤16) counterclockwise, using the traditional adjacent excitation Measurement mode, that is, in a measurement process, in the first step, an AC voltage with an amplitude of V is applied to electrode 1, and the other 15 electrodes are all grounded or kept at the same pot...

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Abstract

The invention relates to a capacitive tomography image reconstruction method based on a closed-loop control principle. The method mainly comprises the following steps of firstly, obtaining N(N-1) / 2 independent measurement values under an empty field condition and N(N-1) / 2 independent measurement values under the condition that an object exists through measurement by utilizing a capacitive tomography imaging system, and establishing an N*N capacitive variation matrix by utilizing a difference between the two types of the independent measurement values; secondly, taking a Calderon algorithm as acontrolled object, solving a new capacitive variation matrix by utilizing dielectric constant distribution inversely derived by the algorithm to serve as a negative feedback, and correcting a deviation value of capacitive variation by adjusting parameters of a PID controller, thereby enabling a whole closed-loop to be converged; and finally, if the number of iterations reaches a preset number ofiterations, ending the iteration and outputting a reconstruction result, otherwise, continuing the iteration. According to the method, the closed-loop control principle is combined with the Calderon algorithm for the first time, so that an image reconstruction error can be effectively reduced and the image reconstruction quality is remarkably improved; and the method has important practical valuesand good application prospects in the field of electrical imaging.

Description

technical field [0001] The invention relates to the field of electrical imaging, in particular to an electrical capacitance tomography image reconstruction method based on a closed-loop control principle. Background technique [0002] Electrical Capacitance Tomography (ECT) technology is a tomography technology developed in the 1980s based on the electromagnetic field sensitivity mechanism. It has no radiation, non-invasiveness, portability, fast response speed, and low price. And other advantages, it has important application prospects in the fields of industry, chemistry and medicine. The electrical capacitance tomography system uses a specially designed sensitive space array electrode to obtain the measured sensitive field information in a non-invasive way, and uses a specific image reconstruction algorithm to reconstruct the distribution of the internal dielectric constant of the measured object according to the boundary capacitance information, thereby obtaining The di...

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Application Information

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IPC IPC(8): G06T11/00
CPCG06T11/005
Inventor 曹章徐立军吉俐胡蝶高欣
Owner BEIHANG UNIV
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