This work deals with the electromagnetic modeling of metallic cylindrical objects, buried in the soil or embedded in a structure, by means of a suitable set of wires. The most widely used criterion for choosing the wire size is the so-called same-area rule, coming from empirical observation and stating that the total surface area of the wires has to be equal to the surface area of the object being modeled. Recent studies have shown that the same-area criterion yields affordable results but is quite far from being the optimum: better results can be obtained with a wire radius shorter than what is suggested by the rule. This motivated us to carry out an investigation of the accuracy of the rule. We carried out simulations by using a commercial software implementing the finite-element method and found that the best accuracy is achieved with wires having a radius about 10-15% shorter than what is suggested by the rule. In particular, when a higher number of wires is used in the model, the radius needs to be shortened more.
Wire-grid modelling of metallic targets for Ground Penetrating Radar applications
Mangini F.;
2019-01-01
Abstract
This work deals with the electromagnetic modeling of metallic cylindrical objects, buried in the soil or embedded in a structure, by means of a suitable set of wires. The most widely used criterion for choosing the wire size is the so-called same-area rule, coming from empirical observation and stating that the total surface area of the wires has to be equal to the surface area of the object being modeled. Recent studies have shown that the same-area criterion yields affordable results but is quite far from being the optimum: better results can be obtained with a wire radius shorter than what is suggested by the rule. This motivated us to carry out an investigation of the accuracy of the rule. We carried out simulations by using a commercial software implementing the finite-element method and found that the best accuracy is achieved with wires having a radius about 10-15% shorter than what is suggested by the rule. In particular, when a higher number of wires is used in the model, the radius needs to be shortened more.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
