On-skin liquid metal inertial sensor

On-skin liquid metal inertial sensor

A wireless on-skin inertial sensor based on free-moving liquid metal is introduced. The inertial sensor comprises a eutectic gallium-indium (eGaIn) droplet that modulates the capacitance between two electrodes. The capacitive output of the sensor is connected to a planar coil to form an LC resonator...

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Bibliographic Details
Published in:Lab on a chip Vol. 17; no. 19; p. 3272
Main Authors: Varga, Matija, Ladd, Collin, Ma, Siyuan, Holbery, Jim, Tröster, Gerhard
Format: Journal Article
Language:English
Published: England 07-10-2017
Subjects:
Acceleration
Equipment Design
Gestures
Humans
Metals - chemistry
Microelectrodes
Silicone Elastomers - chemistry
Skin - chemistry
Wearable Electronic Devices
Wrist - physiology
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Summary:A wireless on-skin inertial sensor based on free-moving liquid metal is introduced. The inertial sensor comprises a eutectic gallium-indium (eGaIn) droplet that modulates the capacitance between two electrodes. The capacitive output of the sensor is connected to a planar coil to form an LC resonator whose resonant frequency can be read out wirelessly. Liquid metal electrodes and the coil are fabricated on a 20 μm thick silicone membrane, which can stretch up to 600%, using spray-deposition of eGaIn. The moving droplet is encapsulated on the opposite side of the membrane using spray-deposition of Dragon Skin 10 silicone. The output characteristics, electrical simulations of the capacitance, and dynamic characteristics of the sensor are shown. The sensor is used for measuring tilt angles and recording arm gestures.
ISSN:1473-0189
DOI:10.1039/c7lc00735c