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Excitation Strategy and System Design of Electromagnetic Tomography

Author: WangQiWei
Tutor: DongFeng
School: Tianjin University
Course: Detection Technology and Automation
Keywords: Electromagnetic tomography Sensor array Excitation frequency Excitation pattern Experimental system
CLC: O441.4
Type: Master's thesis
Year: 2010
Downloads: 88
Quote: 0
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Abstract


Electromagnetic tomography (Electromagnetic Tomography, EMT) is an alternating current is applied to the excitation coil of the distribution of the electromagnetic field boundary in the analyte sensor array based on the principle of electromagnetic induction to produce excitation the main magnetic field inside the object in the the measured electrically conductive permeable excitation induced magnetic field is superimposed with the main magnetic field to obtain information reflecting analyte field conductivity and magnetic permeability distribution of harmonic magnetic field, a voltage is induced in the detecting coil in the the analytes field boundary of the harmonic magnetic field signal, detected by measuring the coil voltage signal conductivity and magnetic permeability of the object field distribution, and then rebuild the spatial distribution of the measured object field image. Relative to other electrical tomography technology, the the electromagnetic tomography development of late, with a non-invasive, real-time, low-cost, etc. are widely used in industrial processes and bio-medicine and other fields, is a great potential for development non-invasive online detection technology. In order to improve the degree of sensitivity of the sensor array changes in the distribution of the object field information, to improve the sensitivity and accuracy of the system and to ensure to obtain experimental data of high precision high stability under the conditions of the 8-electrode sensor array system excitation frequency and The incentive model experimental analysis, and then build a high-performance system experimental platform. The main contents are as follows: 1. Optimization based on the sensor structural parameters of Tianjin University Process Tomography Laboratory simulation results and experimental requirements, design the distance between the variable set of coil turns, coil diameter and coil pipe 8 electromagnetic tomography electrode sensor array; excitation frequency of the electromagnetic tomography sensor array experimental study, were given the empty field, and metal field measurement signal with the excitation frequency changes in the relationship, through the empty field The metal field measurement difference, has been the conclusion of the excitation frequency to 750KHz; single incentive, Experimental comparison of the relative incentive and incentive adjacent three excitation modes, obtained excitation pattern can not improve the quality of the conclusion of the detection coil measurement; according to the characteristics of the sensor array and selected excitation frequency and excitation mode, to build a set of experimental study of electromagnetic tomography system, The system mainly consists of a coil sensor array, signal and selecting the module, FPGA control module, the differential amplifier and AD acquisition module is composed of four parts.

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CLC: > Mathematical sciences and chemical > Physics > Electromagnetics,electrodynamics > Electricity and Magnetism > Electromagnetic waves and electromagnetic fields
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