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Sensors 2018, 18(4), 984; https://doi.org/10.3390/s18040984

Analytical Method to Estimate the Complex Permittivity of Oil Samples

1
CIMITEC, Departament d’Enginyeria Electrònica, Universitat Autònoma de Barcelona, Bellaterra, 08193 Cerdanyola del Valldès, Spain
2
Departamento de Electrónica y Electromagnetismo, Universidad de Sevilla, Av. Reina Mercedes s/n, 41012 Sevilla, Spain
*
Author to whom correspondence should be addressed.
Received: 2 February 2018 / Revised: 15 March 2018 / Accepted: 23 March 2018 / Published: 26 March 2018
(This article belongs to the Section Physical Sensors)
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Abstract

In this paper, an analytical method to estimate the complex dielectric constant of liquids is presented. The method is based on the measurement of the transmission coefficient in an embedded microstrip line loaded with a complementary split ring resonator (CSRR), which is etched in the ground plane. From this response, the dielectric constant and loss tangent of the liquid under test (LUT) can be extracted, provided that the CSRR is surrounded by such LUT, and the liquid level extends beyond the region where the electromagnetic fields generated by the CSRR are present. For that purpose, a liquid container acting as a pool is added to the structure. The main advantage of this method, which is validated from the measurement of the complex dielectric constant of olive and castor oil, is that reference samples for calibration are not required. View Full-Text
Keywords: complex dielectric constant; complex permittivity measurements; microwave sensors; complementary split ring resonator (CSRR); microstrip technology complex dielectric constant; complex permittivity measurements; microwave sensors; complementary split ring resonator (CSRR); microstrip technology
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Su, L.; Mata-Contreras, J.; Vélez, P.; Fernández-Prieto, A.; Martín, F. Analytical Method to Estimate the Complex Permittivity of Oil Samples. Sensors 2018, 18, 984.

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