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Resonant Pressure Sensing Using a Micromechanical Cantilever Actuated by Fringing Electrostatic Fields

Published

Author(s)

Naftaly Krakover, Bojan R. Ilic, Slava Krylov

Abstract

We demonstrate a pressure sensing approach based on the resonant operation of a single crystal Si cantilever positioned near a flexible, pressurized membrane. The membrane deflection perturbs the electrostatic force acting on the cantilever and consequently alters the beam’s resonant frequency. Sensitivity was enhanced by tailoring the actuating force nonlinearities through fringing electrostatic fields. With our coupled micromechanical system, we achieved frequency sensitivity to pressure and displacement of ≈ 30 Hz/kPa and ≈ 4 Hz/nm, respectively. Our results indicate that the suggested approach may have applications not only for pressure measurements, but also in a broad range of microelectromechanical resonant inertial, force, mass and bio sensors.
Proceedings Title
The 31st IEEE International Conference on Micro Electro Mechanical Systems, MEMS 2018
Conference Dates
January 21-25, 2018
Conference Location
Belfast, -1

Keywords

Resonant operation, Pressure sensor, Cantilever, Electrostatic fringing field, MEMS
Created April 26, 2018, Updated June 19, 2018