Evaluation of the thin-skin approximation boundary element method for electromagnetic induction scattering problems
| Autor: | Wuliang Yin, John L. Davidson, Anthony Peyton, Michael D. O'Toole, Liam A Marsh |
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| Rok vydání: | 2016 |
| Předmět: |
Physics
Mathematical optimization Scattering Acoustics 020208 electrical & electronic engineering 02 engineering and technology Boundary knot method 01 natural sciences Finite element method Electromagnetic induction Magnetic field 010309 optics Complex geometry 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Clutter Boundary element method |
| Zdroj: | SAS |
| DOI: | 10.1109/sas.2016.7479843 |
| Popis: | A conductive object subject to an applied varying magnetic field will emit a secondary magnetic field or scattered field. The scattered field is dependent on the geometry of the object and its material properties (conductivity, permeability, etc). If we can calculate the scattered field for a given geometry (the scattering problem), we can infer the material properties from the detected electromagnetic response. Our motivation is the production of induction based classifiers for object and material classification. Applications include sorting of high value scrap metal and identifying UXO from clutter in landmine clearance. To this end, we require methods of solving the scattering problem quickly and accurately. In this paper, we evaluate the thin-skin approximation boundary element method. The method offers a particularly compact formulation of the scattering problem which is quick to solve. We compare this method to the more established finite element method. We find that larger objects at higher frequencies and conductivities appear to give good agreement between the two methods. However, the agreement breaks down for smaller objects even when the frequency or conductivity is relatively high for typical induction based sensing. This is especially true when the object has a complex geometry. This imposes limitations on the practical usefulness of this approach. |
| Databáze: | OpenAIRE |
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