Miniature magneto-oscillatory wireless sensor for magnetic field and gradient measurements

Author:

Fischer F.12ORCID,Jeong M.3ORCID,Qiu T.145ORCID

Affiliation:

1. Division of Smart Technologies for Tumor Therapy, German Cancer Research Center (DKFZ) Site Dresden 1 , 01307 Dresden, Germany

2. Faculty of Engineering Sciences, University of Heidelberg 2 , 69120 Heidelberg, Germany

3. Institute of Physical Chemistry, University of Stuttgart 3 , 70569 Stuttgart, Germany

4. Faculty of Medicine Carl Gustav Carus, Dresden University of Technology 4 , 01307 Dresden, Germany

5. Faculty of Electrical and Computer Engineering, Dresden University of Technology 5 , 01187 Dresden, Germany

Abstract

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-µT resolution to at least ±5 mT and simultaneously detects magnetic field gradients with a resolution of 65 µT/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.

Funder

European Research Council

Ministerium für Wissenschaft, Forschung und Kunst Baden-Württemberg

Publisher

AIP Publishing

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