A tunable stiffness diamagnetic levitation accelerometer with flexible sensing performance

Although diamagnetic levitation technology holds great promise for the development of high-sensitivity accelerometers, the existing designs typically rely on fixed stiffness structures, which significantly limit their adaptability to diverse environmental and measurement conditions. In this work, we propose a feasible static magnetic field control strategy to dynamic modulate the stiffness of diamagnetic levitation accelerometer. A quasi-zero stiffness (QZS) diamagnetic structure is first established, followed by the integration of additional Helmholtz coils to manipulate the external static magnetic field. This enables precise tuning of the potential well distribution of sensitive element. Theoretical analysis demonstrates that this tunable potential approach allows effective control of magnetic stiffness over a wide range from 3.0x10-4 to 2.8x10-2 N/m. As a result, the accelerometer exhibits flexible sensing performance, yielding ultra-high sensitivity up to 2 068 mm/g and an ultra-wide detection range spanning from +/-0.30 mg to +/-62.7 mg.