A Passive Low-Frequency, High-Sensitivity Diamagnetic Levitation Accelerometer

Abstract

Despite the great potential of diamagnetic levitation accelerometers in detecting low-frequency and weak motion, there is still a demand to further enhance their sensitivity for geophysical and microgravity applications. In this study, a straightforward structural modulating approach is presented to enhance the sensitivity of diamagnetic levitation accelerometer from both theoretical and experimental aspects. It is demonstrated that by regulating the structural parameters of sensing element and permanent magnets, one can refine the magnetic field, diamagnetic forces, and eddy current effect, making it feasible to improve the sensitivity. With the optimized structural parameters, a remarkable sensitivity of 7.32 mm/g, accompanied by ultra-low frequency detection capability (0–1.8 Hz), fine resolution (32 μg), and low noise (6.256 μg/Hz^1/2), can be achieved, highlighting the viability of structural design in developing a high-sensitivity accelerometer.

Keywords

accelerometer / diamagnetic levitation / high-sensitivity / low-frequency

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