Evaluation of thin discontinuities in planar conducting materials using the diffraction of electromagnetic field

0479888 - ÚFM 2018 RIV GB eng C - Konferenční příspěvek (zahraniční konf.)
Savin, A. - Nový, F. - Fintová, Stanislava - Steigmann, R.
Evaluation of thin discontinuities in planar conducting materials using the diffraction of electromagnetic field.
MODTECH INTERNATIONAL CONFERENCE - MODERN TECHNOLOGIES IN INDUSTRIAL ENGINEERING V. Bristol: IOP PUBLISHING LTD, 2017 - (Naito, M.; Wrobel, A.; Paunoiu, V.; Nedelcu, V.; Topala, P.; Carausu, C.; Spinu, S.; Oanta, E.; Kifor, C.; Schnakovsky, C.), č. článku 012115. IOP Conference Series-Materials Science and Engineering, 227. ISSN 1757-8981.
[ModTech 2017 - International Conference on Modern Technologies in Industrial Engineering /5./. Sibiu (RO), 14.06.2017-17.06.2017]
Institucionální podpora: RVO:68081723
Klíčová slova: Electromagnetic fields * Electromagnetic wave reflection * Electromagnetic waves * Geometrical optics * Image resolution * Nondestructive examination * Testing
Obor OECD: Electrical and electronic engineering
http://iopscience.iop.org/article/10.1088/1757-899X/227/1/012115/meta

The current stage of nondestructive evaluation techniques imposes the development of new electromagnetic (EM) methods that are based on high spatial resolution and increased sensitivity. In order to achieve high performance, the work frequencies must be either radifrequencies or microwaves. At these frequencies, at the dielectric/conductor interface, plasmon polaritons can appear, propagating between conductive regions as evanescent waves. In order to use the evanescent wave that can appear even if the slits width is much smaller that the wavwelength of incident EM wave, a sensor with metamaterial (MM) is used. The study of the EM field diffraction against the edge of long thin discontinuity placed under the inspected surface of a conductive plate has been performed using the geometrical optics principles. This type of sensor having the reception coils shielded by a conductive screen with a circular aperture placed in the front of reception coil of emission reception sensor has been developed and 'transported' information for obtaining of magnified image of the conductive structures inspected. This work presents a sensor, using MM conical Swiss roll type that allows the propagation of evanescent waves and the electromagnetic images are magnified. The test method can be successfully applied in a variety of applications of maxim importance such as defect/damage detection in materials used in automotive and aviation technologies. Applying this testing method, spatial resolution can be improved.
Trvalý link: http://hdl.handle.net/11104/0275985