Mitigation of mechanical cross-talk in resonant beam accelerometers

Resonant MEMS beam accelerometers have demonstrated remarkable sensitivity and stability, enabling applications in seismology and gravimetry while keeping a small footprint. However, mechanical cross-talk and resonance mode coupling have shown to be specially detrimental to the operation of this kind of accelerometers, especially when employing nano-resonators as the transduction element. In this study, we investigate the mechanical cross-talk of nanoresonator-based accelerometers, through measurement, modelling and simulation of a pendulum accelerometer. We introduce a novel methodology for the early identification of cross-talk during the accelerometer design phase, facilitating proactive detection and mitigation of this issue. Finally, we propose an innovative technique that effectively minimizes mechanical cross-talk with a minimum impact on performance, applicable to a large number of structures. This involves the mechanical decoupling of vibrational modes within the beam resonator from the rest of the accelerometer structure.