Kavli Affiliate: Felix Fischer
| First 5 Authors: Felix Fischer, Moonkwang Jeong, Tian Qiu, ,
| Summary:
Magneto-oscillatory devices have been recently developed as very potent
wireless miniature position trackers and sensors with an exceptional accuracy
and sensing distance for surgical and robotic applications. However, it is
still unclear to which extend a mechanically resonating sub-millimeter magnet
interacts with external magnetic fields or gradients, which induce frequency
shifts of sub-mHz to several Hz and therefore affect the sensing accuracy.
Here, we investigate this effect experimentally on a cantilever-based
magneto-oscillatory wireless sensor (MOWS) and build an analytical model
concerning magnetic and mechanical interactions. The millimeter-scale MOWS is
capable to detect magnetic fields with sub-uT resolution to at least +/- 5 mT,
and simultaneously detects magnetic field gradients with a resolution of 65
uT/m to at least +/- 50 mT/m. The magnetic field sensitivity allows direct
calculation of mechanical device properties, and by rotation, individual
contributions of the magnetic field and gradient can be analyzed. The derived
model is general and can be applied to other magneto-oscillatory systems
interacting with magnetic environments.
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