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Open AccessArticle

An Adaptive Measurement System for the Simultaneous Evaluation of Frequency Shift and Series Resistance of QCM in Liquid

Department of Information Engineering and Mathematical Sciences, University of Siena, 53100 Siena, Italy
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Sensors 2021, 21(3), 678; https://doi.org/10.3390/s21030678
Received: 29 December 2020 / Revised: 14 January 2021 / Accepted: 16 January 2021 / Published: 20 January 2021
(This article belongs to the Section Chemical Sensors)
In this paper, a novel measurement system based on Quartz Crystal Microbalances is presented. The proposed solution was conceived specifically to overcome the measurement problems related to Quartz Crystal Microbalance (QCM) applications in dielectric liquids where the Q-factor of the resonant system is severely reduced with respect to in-gas applications. The QCM is placed in a Meacham oscillator embedding an amplifier with adjustable gain, an automatic strategy for gain tuning allows for maintaining the oscillator frequency close to the series resonance frequency of the quartz, which is related in a simple way with the physical parameters of interest. The proposed system can be used to monitor simultaneously both the series resonant frequency and the equivalent electromechanical resistance of the quartz. The feasibility and the performance of the proposed method are proven by means of measurements obtained with a prototype based on a 10-MHz AT-cut quartz. View Full-Text
Keywords: QCM sensors; in-liquid measurements; bridge oscillators QCM sensors; in-liquid measurements; bridge oscillators
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MDPI and ACS Style

Fort, A.; Panzardi, E.; Vignoli, V.; Tani, M.; Landi, E.; Mugnaini, M.; Vaccarella, P. An Adaptive Measurement System for the Simultaneous Evaluation of Frequency Shift and Series Resistance of QCM in Liquid. Sensors 2021, 21, 678. https://doi.org/10.3390/s21030678

AMA Style

Fort A, Panzardi E, Vignoli V, Tani M, Landi E, Mugnaini M, Vaccarella P. An Adaptive Measurement System for the Simultaneous Evaluation of Frequency Shift and Series Resistance of QCM in Liquid. Sensors. 2021; 21(3):678. https://doi.org/10.3390/s21030678

Chicago/Turabian Style

Fort, Ada; Panzardi, Enza; Vignoli, Valerio; Tani, Marco; Landi, Elia; Mugnaini, Marco; Vaccarella, Pietro. 2021. "An Adaptive Measurement System for the Simultaneous Evaluation of Frequency Shift and Series Resistance of QCM in Liquid" Sensors 21, no. 3: 678. https://doi.org/10.3390/s21030678

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