A wearable fiber-optic sensor for monitoring human elbow and wrist joint motion

Min Li, Bo He, Xingang Zhao, Jun Xie, Wei Yao, Guanghua Xu

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This article describes a wearable sensor for monitoring the motion of human elbow and wrist joints. The sensor converts the joint motion angle into a displacement, which is monitored using a fiber-optic sensor based on reflective light intensity modulation. A mathematical model is established, and the potential influencing factors of the sensor are investigated. Two prototypes for elbow and wrist joint angle monitoring are fabricated and validated. The experimental results indicate that the proposed sensor has a measurement range of 0–60° (0–120°), with a resolution of 0.338° (3.6°) for monitoring the wrist joint palm flexion (elbow joint flexion). The proposed sensor has the potential to be used for rehabilitation purposes and monitoring of joint angles while performing reaching tasks, which are the most common upper-limb gestures.
Original languageEnglish
JournalAdvanced Robotics
Early online date30 Oct 2020
Publication statusE-pub ahead of print - 30 Oct 2020


  • fiber optic sensor
  • joint angle monitoring
  • light intensity-modulated sensor
  • wearable sensor


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