Modified Transceiver Antenna for NQR Detection of Explosive Objects in Demining Conditions

Andrii Samila, Oleksandra Hotra (), Oleksandr Moisiuk, Mykola Khobzei and Taras Kazemirskiy
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Andrii Samila: Department of Radio Engineering and Information Security, Yuriy Fedkovych Chernivtsi National University, Kotsyubynsky 2, 58002 Chernivtsi, Ukraine
Oleksandra Hotra: Department of Electronics and Information Technology, Lublin University of Technology, Nadbystrzycka 38D, 20-618 Lublin, Poland
Oleksandr Moisiuk: Department of Radio Engineering and Information Security, Yuriy Fedkovych Chernivtsi National University, Kotsyubynsky 2, 58002 Chernivtsi, Ukraine
Mykola Khobzei: Department of Radio Engineering and Information Security, Yuriy Fedkovych Chernivtsi National University, Kotsyubynsky 2, 58002 Chernivtsi, Ukraine
Taras Kazemirskiy: Department of Radio Engineering and Information Security, Yuriy Fedkovych Chernivtsi National University, Kotsyubynsky 2, 58002 Chernivtsi, Ukraine

Energies, 2022, vol. 15, issue 19, 1-12

Abstract: This paper presents the conceptual stages of the simulation and development of a modified transceiver antenna for a high-power pulsed nuclear quadrupole resonance (NQR) detector of explosives containing the 14 N isotope. At a frequency of 4.645 MHz, better characteristics are obtained using a nine-turn coil shaped as half of a Fermat spiral with an outer radius of 75 mm. Using a COMSOL Multiphysics numerical parametric simulation and a materials browser, it was possible to calculate a physical system with parameters as close to reality as possible. According to the results of the experimental studies of the radio frequency (RF) energy, the proposed antenna features an increase in the working area compared to a similar antenna, the topology of the conductive coil of which has the form of an Archimedean spiral. The resulting diagrams of the distribution of the magnetic induction also indicate that the topology of the electromagnetic (EM) field does not depend on the orientation of the sample under study relative to the axis of the radial symmetry observed in square–rectangular planar antennas.

Keywords: nuclear quadrupole resonance; spiral antenna; Fermat spiral; magnetic field decay; simulation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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