A High-sensitivity Cylindrical Cavity Resonator Sensor for the Characterization of Aqueous Solutions

GELOSI, I. E.; BONADERO,J. C.; AVALOS RIBAS, R.; CASTIÑEIRA MOREIRA, J.; URIZ, A. J.

IEEE SENSORS JOURNAL

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

Lugar: New York; Año: 2021 vol. 21

1530-437X

In this paper, a high sensitivity concentration sensorfor aqueous solutions is presented. The device is a cylindrical cavityresonator operating around a frequency of 1.5 gigahertz. Themeasurement procedure is simple, instantaneous, non-destructive,and obtains information from two different resonance parameters(frequency and amplitude). Samples are introduced via small,standard test tubes, and a very small amount (around fourmilliliters) is sufficient to perform a measurement. The designis first approached from a theoretical perspective, after which,empirical adjustments are paired with a simulation-based designoptimization. The resulting topology is constructed, showingagreement with said simulations. The final sensor can be used,after a regression type calibration, to indirectly measure theconcentration of a liquid solution of known components. Theexperimental validation, employing different mixtures, demonstratesthat the proposed device shows an enhanced sensitivity tosolution concentration when compared to other resonator-basedarrangements found in the literature.