Grounding grid state electrode focusing type electrical impedance imaging system and method

Abstract

The invention provides a grounding grid state electrode focusing type electrical impedance imaging system and method. Focusing type electrode arrays are uniformly distributed around a three-dimensional grounding grid, constant current signals input by upper and lower focusing electrodes of the focusing type electrode arrays repel and extrude in-phase constant current signals input by a main electrode by utilizing the principle that in-phase currents repel each other, so that the current of the main electrode is focused on a section detected by a grounding grid field domain, and two-dimensionalprocessing of a three-dimensional grounding grid problem is realized; and an inverse problem is solved by applying a Newton-Raphson electrode focusing type grounding grid field domain resistivity distribution reconstruction algorithm to obtain resistivity distribution of the grounding grid field domain, so that the corrosion state of the grounding grid is reflected from an image, the diagnosis ofthe corrosion state is realized, an original three-dimensional grounding grid state electrical impedance imaging problem is converted into a two-dimensional grounding grid state electrical impedanceimaging problem which is relatively mature and deep in research, the detection efficiency is relatively high, and the requirements of actual engineering detection application are better met.

Description

technical field [0001] The invention relates to an electrode-focused grounding grid electrical impedance imaging system. In particular, it relates to a two-dimensional simplified electrical impedance imaging system and method for detecting the state of a three-dimensional grounding grid through a focused electrode array. Background technique [0002] Electrical impedance imaging is to reconstruct the current field, and obtain the information reflected by the resistivity distribution obtained by imaging. The theoretical basis of the grounding grid electrical impedance imaging technology is that the soil layer where the grounding grid is located is equivalent to a biological tissue fault in medical electrical impedance imaging. When the grounding grid branch is corroded, the equivalent resistivity of the corroded part will become larger. The resistivity distribution image of the entire grounding grid field is obtained by electrical impedance imaging, so as to locate the corro...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcoming of the existing grounding grid state electrical impedance imaging single-electrode excitation system current three-dimensional divergence phenomenon inside the grounding grid field, and propose a Ground grid state electrode focusing electrical impedance imaging system

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