微型磁振无线传感器可精准测磁场与梯度，助力手术机器人定位
Miniature magneto-oscillatory wireless sensor for magnetic field and gradient measurements
- 基于悬臂结构的磁振传感器，通过频率偏移感知磁场与梯度
- 磁场分辨率达亚微特斯拉，梯度分辨率65 uT/m，量程±50 mT/m
- 模型通用性强，适用于各类磁振传感系统，适合医疗机器人应用
磁振器件作为高精度无线微型位置追踪器和传感器，在手术与机器人应用中表现出优异性能。然而，亚毫米级磁体在外部磁场或梯度作用下的机械共振行为仍不明确，其引起的频率偏移可达亚毫赫兹至几赫兹，影响测量精度。本文针对基于悬臂的磁振无线传感器（MOWS）开展实验研究，并建立磁-力耦合解析模型。该毫米级MOWS可实现磁场分辨率达亚微特斯拉（sub-uT），量程覆盖±5 mT；同时检测磁场梯度，分辨率65 uT/m，量程达±50 mT/m。磁场灵敏度可用于反推器件机械参数，旋转测量可分离磁场与梯度贡献。所建模型具普适性，可推广至其他磁振交互系统。
原文摘要 · Abstract (English)
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.
Thank you to arXiv for use of its open access interoperability. PaperDance 不是 arXiv 官方产品；中文卡片由大模型生成，请以原文为准。