Ultra high quality factor resonators operated in fluids

•We present a new concept to increase the quality factor of resonators operated in air.•We design a new custom tuning fork based on the new concept.•We fabricate the latter tuning fork and measure its quality factor.•We show the highest quality factor ever reported for a tuning fork in ambient air....

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Bibliographic Details
Published in:Sensors and actuators. A. Physical. 2018-01, Vol.269, p.569-573
Main Authors: Aoust, Guillaume, Levy, Raphaël, Verlhac, Béatrice, Le Traon, Olivier
Format: Article
Language:English
Subjects:
Atmospheric pressure
Cavity resonators
Damping
Engineering Sciences
Physics
Q factors
Q-value
Radiation
Resonators
Sensors
Sound waves
Studies
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Summary:•We present a new concept to increase the quality factor of resonators operated in air.•We design a new custom tuning fork based on the new concept.•We fabricate the latter tuning fork and measure its quality factor.•We show the highest quality factor ever reported for a tuning fork in ambient air. Maximal quality factors are often a synonym for high performances for resonator based sensing devices. When vibrating within a fluid, several damping mechanisms dramatically reduce their performances. We propose a new concept to drastically reduce acoustic radiation damping. A specifically designed cavity enclosing the resonator is presented, able to couple the radiated field back in the resonator. Experiments on a custom tuning fork have been carried out and a cavity design is presented. This enclosing cavity tenfold its quality factor to reach Q = 75,000 in air at atmospheric pressure, passing through the established physical limits and setting a new record. The presented concept can be extended to many areas of physics employing high quality factor resonators, allowing the exploration of completely new geometries.
ISSN:0924-4247
1873-3069
DOI:10.1016/j.sna.2017.12.026