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Study on Underground 3D Target Recognition and Imaging Technology by Steady Current Field

Author: LinJian
Tutor: ZuoShu
School: Jiangsu University
Course: Communication and Information System
Keywords: Constant current field Target recognition High resolution resistivity method Monopole - dipole device Direct Imaging
CLC: TP391.41
Type: Master's thesis
Year: 2010
Downloads: 34
Quote: 0
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Abstract


High-resolution, high-precision target recognition imaging is the development trend of the current underground target detection and recognition. China coal as the main energy, water inrush caused by unknown goaf caving, surface subsidence and other geological disasters, harm and hazards to the security production of mine personnel and the ground the residents life and property. Greater difference, electrical and electromagnetic methods of resistivity and the resistivity of the surrounding rock underground goaf inflatable and water-filled goaf detection method commonly used. Which belong to the constant current field of 2D high resolution resistivity (HighResolution Rsistivity HRR) identification and imaging technology in the goaf detection achieved good results and get a wide range of applications. However, the actual detection problem is the problem of three-dimensional space, in order to further improve the detection accuracy of the 2D-HRR papers by 3D finite element numerical simulation analysis the 3D underground objectives in the field of constant current response characteristics to overcome the deficiencies of the 2D-HRR, development 3D detection and imaging methods, to further improve the detection accuracy of the HRR. This gives the Maxwell equations in the constant current field, made a detailed proof of the three types of boundary conditions of the potential Boundary Value Uniqueness Theorem. On this basis, derived Variational equivalent to the constant current field boundary value problems. For the the HRR model of uniform half-space isolated target body, given the approach of the first boundary condition in the finite element algorithm block solution of linear equations. Between the finite element simulation results of the the underground 3D target body affirmed the applicability of the isolated target the HRR technology detection goaf, etc., at the same time to determine the pole - dipole field of constant current location of the target body ground abnormal response relationship, as 2D high resolution resistivity method can be extended to 3D hemispherical 3D direct imaging provides a theoretical basis. The flume experiments confirmed the detection electrode arrangement proposed in this paper, the validity of the calculation of the direct imaging. The 3D-HRR promotion detect unknown underground cave existing 2D-HRR method can overcome the positioning and morphology are not allowed to occur, as well as the general 3D high-density resistivity method is not sensitive to the target body underground isolated problems. Direct imaging technology to solve the general 3D imaging algorithms to complex, time-consuming problem of a long and difficult convergence. Of course, the required observation workload is enormous, and for this must improved instrument, developed to facilitate construction of the cable, the electrode device, so that the 3D high resolution resistivity probe to achieve a practical and efficient level.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Pattern Recognition and devices > Image recognition device
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