4.7 Article

Magnetized Micropillar-Enabled Wearable Sensors for Touchless and Intelligent Information Communication

Journal

NANO-MICRO LETTERS
Volume 13, Issue 1, Pages -

Publisher

SHANGHAI JIAO TONG UNIV PRESS
DOI: 10.1007/s40820-021-00720-5

Keywords

Electronic skin; Human-machine interaction; Cryptic information communication; Magnetic field sensing; Tilted magnetized micropillar

Funding

  1. Science and Technology Development Fund, Macau SAR [0037/2018/A1, 0026/2020/AGJ]
  2. University of Macau [MYRG2017-00089-FST, MYRG2018-00063-IAPME]

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A capacitive sensor of magnetic field based on a tilted flexible micromagnet array (t-FMA) was proposed, capable of real-time recognition of magnetic field magnitude and orientation with high sensitivity and excellent durability. The sensor has been successfully applied to touchless Morse code and Braille communication systems, providing a potential avenue for cryptic information interaction and multi-control instruction outputting.
The wearable sensors have recently attracted considerable attentions as communication interfaces through the information perception, decoding, and conveying process. However, it is still challenging to obtain a sensor that can convert detectable signals into multiple outputs for convenient, efficient, cryptic, and high-capacity information transmission. Herein, we present a capacitive sensor of magnetic field based on a tilted flexible micromagnet array (t-FMA) as the proposed interaction interface. With the bidirectional bending capability of t-FMA actuated by magnetic torque, the sensor can recognize both the magnitude and orientation of magnetic field in real time with non-overlapping capacitance signals. The optimized sensor exhibits the high sensitivity of over 1.3 T-1 and detection limit down to 1 mT with excellent durability. As a proof of concept, the sensor has been successfully demonstrated for convenient, efficient, and programmable interaction systems, e.g., touchless Morse code and Braille communication. The distinguishable recognition of the magnetic field orientation and magnitude further enables the sensor unit as a high-capacity transmitter for cryptic information interaction (e.g., encoded ID recognition) and multi-control instruction outputting. We believe that the proposed magnetic field sensor can open up a potential avenue for future applications including information communication, virtual reality device, and interactive robotics.

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