Journal
IEEE SENSORS JOURNAL
Volume 22, Issue 1, Pages 107-114Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2021.3125694
Keywords
Ferrofluid; Magnetic levitation; Force; Magnetic flux; Magnetoelasticity; Inertial sensors; Sensors; Ferrofluid; inertial sensor; magnetic field; buoyant force
Funding
- Beijing Natural Science Foundation [3204042]
- National Natural Science Foundation of China [52005283]
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This paper presents an inertial sensor that utilizes the self-levitation of a magnetic object in ferrofluids. The absorbed ferrofluid on the magnetic object creates an unusual buoyant force that counters gravity and acts as an elastic force. The analysis of the buoyant force is crucial in achieving excellent static performance for the sensor.
In this paper, an inertial sensor exploiting the self-levitation of a magnetic object immersed in ferrofluids is presented. The ferrofluid absorbed on the magnetic object produces an unusual buoyant force that resists gravity and serves as an elastic force. When the magnetic object moves under an external perturbation, the elastic force tries to return the magnetic object to its initial position. Therefore, the analysis of the buoyant force is the key to ensuring that the inertial sensor can achieve the excellent static performance. A series of simulations and experiments are used to optimize the buoyant force. Furthermore, the stable levitation height of the magnetic object is determined, and the influence of the ferrofluid mass on the buoyant force is studied. The comparison between numerical calculations and experimental measurements shows a good agreement. The satisfactory linearity and high sensitivity indicate the feasibility of the ferrofluid inertial sensor.
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