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Quality Factor and Vibration Amplitude Based Viscosity Measurements Using Suspended Microchannel

This video was recorded in 2012 and posted in 2021 Sponsored by IEEE Sensors Council (https://ieee-sensors.org/) Title: Quality Factor and Vibration Amplitude Based Viscosity Measurements Using Suspended Microchannel Resonators Author: Il Lee, Jungchul Lee Abstract: We report precision viscosity measurements using suspended microchannel resonators (SMRs) . Two different methods are developed and applied to glycerol-water binary mixtures having various weight ratios. First, open loop frequency sweep and harmonic oscillator fitting is employed to extract the quality factor (Q-factor) of an SMR. Second, closed loop feedback operation is employed while the vibration amplitude is continuously monitored. Both the Q-factor and vibration amplitude increase with increasing viscosity for the tested SMR and they agree well after rescaling. Viscosity measurements using the Q-factor change are compared with measurements using a bench-top tuning fork viscometer. While the bench-top tuning fork viscometer measures static viscosity (density ¡¿ dynamic viscosity) thus always requires density correction, the SMR Q-factor measurement provides dynamic viscosity directly. In addition, SMR measurements require sample volume of ~50 ¥ìL while the bench-top viscometer requires ~10 mL per each measurement. IEEE Sensors Conferences (https://ieee-sensors.org/conferences/) IEEE Sensors Journal (https://ieee-sensors.org/sensors-jour...) IEEE Sensors Letters (https://ieee-sensors.org/sensors-lett...) IEEE Internet of Things Journal (https://ieee-iotj.org/) IEEE SENSORS conference proceedings (https://ieeexplore.ieee.org/xpl/conho...)