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Liquid Metal-Filled 3D Structure Wearable Sensor for Finger Bending Monitoring

Wearable sensors have many potential applications in health and tactile touch monitoring. In particular, Liquid Metal (LM) based wearable sensors have attracted more and more attentions as they can measure large deformations without failure. However, most of the current LM-based wearable sensors are 2D flaky structure, which making them position unstable while wearing, and induce measurement errors. In this report, a novel finger bending angle monitoring sensor with 3D hollow design based on embedded LM microchannels is presented. Because of the hollow design, this sensor can be easily worn on the finger joints and can accurately distinguish the finger bending angle. And real-time monitoring can be achieved by measuring the inductance value. The results suggest that the studied wearable sensor has excellent stability and reliability. And this sensor has better practical applications in finger action health detection.