In this paper, preliminary results of variations as a function of applied pressure in the reflection coefficient of a planar patch resonator, placed in contact with cultural heritage stone materials, will be presented. The general aim of the experimental project is to correlate the resonant frequency of the planar sensor, for the different pressures applied to the resonator, with the different levels of water content θv of the tested stone material. In fact, in previous works, it has been demonstrated that by placing a planar resonator in contact with the considered stone sample, it is possible to associate the resonant frequency of the resonator with the moisture content of the stone sample, through reflection scattering parameter measurements. In previous studies, however, the level of applied pressure is not standardized and controlled. An application of an external force could improve the repeatability and increase the detectability of the first resonance peak. The current study shows a negligible resonant frequency shift among measurements with different applied pressures at the same water content θv level, but a significant change regarding Q factor. Moreover, applying an external force on the patch, the first resonance peak can be identified more easily, thanks to an increase in the Q factor.

Effect of applied pressure on patch resonator-based measurements of moisture level for cultural heritage materials / D'Alvia, Livio; Pittella, Erika; Pisa, Stefano; Piuzzi, Emanuele; DEL PRETE, Zaccaria. - (2018), pp. 1-5. (Intervento presentato al convegno 2018 IEEE International conference on metrology for archaeology and cultural heritage, MetroArchaeo 2018 tenutosi a Cassino) [10.1109/MetroArchaeo43810.2018.13579].

Effect of applied pressure on patch resonator-based measurements of moisture level for cultural heritage materials

livio d'alvia
Primo
;
Erika Pittella;Stefano Pisa;Emanuele Piuzzi;Zaccaria Del Prete
2018

Abstract

In this paper, preliminary results of variations as a function of applied pressure in the reflection coefficient of a planar patch resonator, placed in contact with cultural heritage stone materials, will be presented. The general aim of the experimental project is to correlate the resonant frequency of the planar sensor, for the different pressures applied to the resonator, with the different levels of water content θv of the tested stone material. In fact, in previous works, it has been demonstrated that by placing a planar resonator in contact with the considered stone sample, it is possible to associate the resonant frequency of the resonator with the moisture content of the stone sample, through reflection scattering parameter measurements. In previous studies, however, the level of applied pressure is not standardized and controlled. An application of an external force could improve the repeatability and increase the detectability of the first resonance peak. The current study shows a negligible resonant frequency shift among measurements with different applied pressures at the same water content θv level, but a significant change regarding Q factor. Moreover, applying an external force on the patch, the first resonance peak can be identified more easily, thanks to an increase in the Q factor.
2018
2018 IEEE International conference on metrology for archaeology and cultural heritage, MetroArchaeo 2018
cultural heritage; dielectric permittivity; moisture content measurements; patch resonator; stones
04 Pubblicazione in atti di convegno::04b Atto di convegno in volume
Effect of applied pressure on patch resonator-based measurements of moisture level for cultural heritage materials / D'Alvia, Livio; Pittella, Erika; Pisa, Stefano; Piuzzi, Emanuele; DEL PRETE, Zaccaria. - (2018), pp. 1-5. (Intervento presentato al convegno 2018 IEEE International conference on metrology for archaeology and cultural heritage, MetroArchaeo 2018 tenutosi a Cassino) [10.1109/MetroArchaeo43810.2018.13579].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1353893
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