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In designing micro-scale vibrating sensors, the achievement of very high quality factor (Q) resonators working in bending mode remains a major issue. Special attention has been paid in this work to explore the Q limitations of single-crystal silicon bending beam resonators and their dependences on geometry, temperatures and pressure for a large range of resonators. In order to preserve the resonating element from support damping, a system with high decoupling efficiency has been optimized using FEM analyses and implemented. Quality factor as a function of frequency shows the transition between thermoelastic damping (TED) and surface damping as limiting mechanism with the miniaturization of the resonators: At high vacuum, the thermoelastic theory is experimentally validated to be the main damping source for Q up to 4.0x104. Beyond these values (Q > 1.4x105) the surface effects are evidenced and characterized with thickness and frequency variations.
Sensors, 2006. 5th IEEE Conference on
Date of Conference: 22-25 Oct. 2006