Split ring resonator-based microwave fluidic sensors for electrolyte concentration measurements
Vélez Rasero, Paris (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)
Muñoz Enano, Jonathan (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)
Grenier, Katia (Laboratory of Analysis and Architecture of System (Toulouse, França))
Mata Contreras, Francisco Javier (Universidad de Málaga. Departamento de Ingeniería de Comunicaciones)
Dubuc, David (Laboratory of Analysis and Architecture of System (Toulouse, França))
Martín, Ferran (Martín Antolín) (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)

Date:	2019
Abstract:	A differential microwave sensor, based on a pair of uncoupled microstrip lines each one loaded with a split ring resonator (SRR), is applied to the measurement of electrolyte concentration in deionized (DI) water. For that purpose, fluidic channels are added on top of the SRR gaps, the most sensitive parts of the structure. The operating principle is based on the measurement of the cross-mode insertion loss, highly sensitive to small asymmetries caused by differences between the reference liquid and the liquid under test (LUT). In this paper, the reference liquid is pure DI water (the solvent), whereas the solution, DI water with electrolyte content, is injected to the LUT channel. The proposed sensor is able to detect electrolyte concentrations as small as 0. 25 g/L, with maximum sensitivity of 0. 033 (g/L) ⁻¹ . The sensor is validated by measuring the concentration of three types of electrolytes, i. e. , NaCl, KCl, and CaCl2. Finally, the sensor is applied to monitor variations of total electrolyte concentration in urine samples.
Grants:	Ministerio de Economía y Competitividad TEC2016-75650-R Agència de Gestió d'Ajuts Universitaris i de Recerca 2014SGR-157 Agència de Gestió d'Ajuts Universitaris i de Recerca ACCIO/TECSPR15-1-0050
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	Differential sensors ; Electrolyte concentration ; Microfluidics ; Microstrip technology ; Microwave sensors ; Permittivity measurements ; Split ring resonator (SRR)
Published in:	IEEE sensors journal, Vol. 19, no. 7 (April 2019) , p. 2562-2569, ISSN 1530-437X

DOI: 10.1109/JSEN.2018.2890089

Postprint 9 p, 1.0 MB

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