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Fluid Sensing Using Quartz Tuning Forks—Measurement Technology and Applications
Open AccessArticle

Dynamic Responses of Electrically Driven Quartz Tuning Fork and qPlus Sensor: A Comprehensive Electromechanical Model for Quartz Tuning Fork

by Manhee Lee 1,*, Bongsu Kim 2, Sangmin An 2 and Wonho Jhe 2,*
1
Department of Physics, Chungbuk National University, Cheongju, Chungbuk 28644, Korea
2
Department of Physics and Astronomy, Seoul National University, Gwanak-gu, Seoul 08826, Korea
*
Authors to whom correspondence should be addressed.
Sensors 2019, 19(12), 2686; https://doi.org/10.3390/s19122686
Received: 6 May 2019 / Revised: 10 June 2019 / Accepted: 11 June 2019 / Published: 14 June 2019
(This article belongs to the Special Issue Quartz Tuning Fork-based Sensors)
A quartz tuning fork and its qPlus configuration show different characteristics in their dynamic features, including peak amplitude, resonance frequency, and quality factor. Here, we present an electromechanical model that comprehensively describes the dynamic responses of an electrically driven tuning fork and its qPlus configuration. Based on the model, we theoretically derive and experimentally validate how the peak amplitude, resonance frequency, quality factor, and normalized capacitance are changed when transforming a tuning fork to its qPlus configuration. Furthermore, we introduce two experimentally measurable parameters that are intrinsic for a given tuning fork and not changed by the qPlus configuration. The present model and analysis allow quantitative prediction of the dynamic characteristics in tuning fork and qPlus, and thus could be useful to optimize the sensors’ performance. View Full-Text
Keywords: quartz tuning fork; qPlus; atomic force microscopy; sensor quartz tuning fork; qPlus; atomic force microscopy; sensor
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Lee, M.; Kim, B.; An, S.; Jhe, W. Dynamic Responses of Electrically Driven Quartz Tuning Fork and qPlus Sensor: A Comprehensive Electromechanical Model for Quartz Tuning Fork. Sensors 2019, 19, 2686.

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