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Towards an Ultra Sensitive Hybrid Mass Sensor Based on Mode Localization without Resonance Tracking

FEMTO-ST Institute, University Bourgogne Franche-Comté, CNRS/UFC/ENSMM/UTBM, 25000 Besançon, France
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Sensors 2020, 20(18), 5295; https://doi.org/10.3390/s20185295
Received: 23 July 2020 / Revised: 26 August 2020 / Accepted: 11 September 2020 / Published: 16 September 2020
(This article belongs to the Section Physical Sensors)
We present a mode localized mass sensor prototype based on a hybrid system excited at a fixed frequency slightly below the resonances. Indeed, we show, both theoretically and experimentally, that this condition yields higher sensitivities and similar sensitivity ranges than that of resonance peak tracking while being less time consuming than a classical open-loop configuration due to the absence of frequency sweep. The system is made of a quartz resonator and a hardware that includes a resonator and the coupling. The digital aspect allows maximum sensitivity to be achieved with a fine tuning of the different parameters and the implementation of a coupling, regardless of the physical resonator geometry. This allows the generation of mode localization on shear waves resonant structures such as the quartz cristal microbalance widely used in biosensing. This solution has been successfully implemented using resin micro balls depositions. The sensitivities reach almost their maximum theoretical values which means this fixed frequency method has the potential to reach lower limit of detection than the open loop frequency tracking method. View Full-Text
Keywords: mode localization; mass sensing; QCM; FPGA; hybrid system; open loop; fixed frequency mode localization; mass sensing; QCM; FPGA; hybrid system; open loop; fixed frequency
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Humbert, C.; Walter, V.; Kacem, N.; Leblois, T. Towards an Ultra Sensitive Hybrid Mass Sensor Based on Mode Localization without Resonance Tracking. Sensors 2020, 20, 5295.

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