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Open AccessArticle

A Soft Sensor-Based Three-Dimensional (3-D) Finger Motion Measurement System

Department of Mechanical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea
Author to whom correspondence should be addressed.
Academic Editors: Hyun-Joong Chung and Tae-il Kim
Sensors 2017, 17(2), 420;
Received: 20 December 2016 / Revised: 30 January 2017 / Accepted: 10 February 2017 / Published: 22 February 2017
(This article belongs to the Special Issue Flexible Electronics and Sensors)
In this study, a soft sensor-based three-dimensional (3-D) finger motion measurement system is proposed. The sensors, made of the soft material Ecoflex, comprise embedded microchannels filled with a conductive liquid metal (EGaln). The superior elasticity, light weight, and sensitivity of soft sensors allows them to be embedded in environments in which conventional sensors cannot. Complicated finger joints, such as the carpometacarpal (CMC) joint of the thumb are modeled to specify the location of the sensors. Algorithms to decouple the signals from soft sensors are proposed to extract the pure flexion, extension, abduction, and adduction joint angles. The performance of the proposed system and algorithms are verified by comparison with a camera-based motion capture system. View Full-Text
Keywords: soft sensor; wearable sensor; finger motion measurement; finger joint modeling soft sensor; wearable sensor; finger motion measurement; finger joint modeling
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Park, W.; Ro, K.; Kim, S.; Bae, J. A Soft Sensor-Based Three-Dimensional (3-D) Finger Motion Measurement System. Sensors 2017, 17, 420.

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