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Article

Permittivity Measurements for Cypress and Rockrose Biomass Versus Temperature, Density, and Moisture Content

1
Departamento de Tecnologías de la Información y las Comunicaciones, Universidad Politécnica de Cartagena, 30202 Cartagena, Spain
2
Centro de Desarrollo de Energías Renovables, CEDER-CIEMAT, 42290 Lubia, Spain
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(17), 4684; https://doi.org/10.3390/s20174684
Received: 1 July 2020 / Revised: 3 August 2020 / Accepted: 14 August 2020 / Published: 19 August 2020
(This article belongs to the Section Physical Sensors)
Permittivity of materials is of utmost importance for microwave applicators’ design and to predict high-frequency dielectric heating of materials. In the case of aromatic plant biomass, however, there are few data that help researchers design microwave applicators for microwave-assisted extraction. In this work, the permittivity of cypress and rockrose biomass samples were measured versus temperature, density, and moisture content. A resonant technique based on a coaxial bi-reentrant microwave cavity was employed to obtain the complex permittivity of biomass samples as a function of those magnitudes around the 2.45 GHz ISM frequency. The obtained measurements show that large variations for permittivity values can be found with moisture content and density changes for both cypress and rockrose biomass. Temperature also has effects in a lesser degree, although it has an important influence on the cypress biomass loss factor. Polynomial expressions fitting the experimental data were provided in order to facilitate the estimation of intermediate values, which were not explicitly arranged in this work. As a general trend, the permittivity of cypress and rockrose biomass increases with increasing values of moisture content and density, whereas the biomass loss factor increases when temperature rises. View Full-Text
Keywords: cypress; rockrose; biomass; permittivity; resonant technique; dielectric constant; loss factor cypress; rockrose; biomass; permittivity; resonant technique; dielectric constant; loss factor
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MDPI and ACS Style

Pérez-Campos, R.; Fayos-Fernández, J.; Lozano-Guerrero, A.J.; Martínez-González, A.; Monzó-Cabrera, J.; Mediavilla, I.; Peña-Carro, D.; Esteban-Pascual, L.S. Permittivity Measurements for Cypress and Rockrose Biomass Versus Temperature, Density, and Moisture Content. Sensors 2020, 20, 4684. https://doi.org/10.3390/s20174684

AMA Style

Pérez-Campos R, Fayos-Fernández J, Lozano-Guerrero AJ, Martínez-González A, Monzó-Cabrera J, Mediavilla I, Peña-Carro D, Esteban-Pascual LS. Permittivity Measurements for Cypress and Rockrose Biomass Versus Temperature, Density, and Moisture Content. Sensors. 2020; 20(17):4684. https://doi.org/10.3390/s20174684

Chicago/Turabian Style

Pérez-Campos, Rafael, José Fayos-Fernández, Antonio José Lozano-Guerrero, Antonio Martínez-González, Juan Monzó-Cabrera, Irene Mediavilla, David Peña-Carro, and Luis Saúl Esteban-Pascual. 2020. "Permittivity Measurements for Cypress and Rockrose Biomass Versus Temperature, Density, and Moisture Content" Sensors 20, no. 17: 4684. https://doi.org/10.3390/s20174684

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