Papers by Author: Pablo Hernández-Gómez

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Authors: J. Íñiguez, V. Raposo, Ana García Flores, M. Zazo, Pablo Hernández-Gómez
Abstract: Metal foams are very interesting materials in new emerging technologies as aeronautic, spatial research, auto-motion or heat exchanger, but there are other areas in which these materials could be advantageous. Here is a new proposal for using these materials in electromagnetic shielding. The goal is to demonstrate that, although having a smaller effective electrical conductivity than massive materials, it is possible to attain operative electromagnetic shielding with a reduction of mass and, in addition, to bring together in a single product a supplementary protection against vibrations, impact, noise, etc., as corresponds to the well-known properties of porous materials. In terms of the operating frequency, conductivity and thickness of the metallic foams the electromagnetic screening was calculated. It is shown how to guarantee a specified shielding the necessary thickness in porous materials with respect to massive metals obeys to a quadratic relation.
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Authors: Pablo Hernández-Gómez, Carlos de Francisco, Carlos Torres, J.M. Muñoz, O. Alejos, José Ignacio Iñiguez, V. Raposo, João M. Perdigão, A.R. Ferreira, C.S. Furtado
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Authors: Pablo Hernández-Gómez, Carlos Torres, Carlos de Francisco, José Ignacio Iñiguez, João M. Perdigão
Abstract: The magnetic disaccommodation on polycrystalline Nd doped YIG NdxY3-xFe5O12 (0
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Authors: J. Íñiguez, V. Raposo, D. García, A.G. Flores, M. Zazo, Pablo Hernández-Gómez, Carlos de Francisco
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Authors: J. Íñiguez, V. Raposo, Pablo Hernández-Gómez
Abstract: An accurate technique for contact-less measurement of resistivity in non-magnetic conductive tubes has been developed. It is intended for application in non-destructive testing (NDT) in tube manufacturing by simple study of the induced currents. Inhomogeneities or minimal imperfections in the tube thickness are immediately detected. This measuring technique is also suitable for determining the thickness of very thin metal coatings on non-conductive tubes. The experimental setup corresponds to an electrical transformer, the tube being the core. A first coil is placed around the tube under test, whereas the detecting coil is placed inside it. The study of the magnetic screening caused by the currents induced in the tube, allows its conductivity to be determined. The use of low frequency guarantees the almost complete absence of the skin effect in such a way that the results are obtained in a very simple manner. The method is based on the determination of the phase angle of the complex mutual inductance between the two coils working under low frequency conditions.
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