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Related Experiment Videos

A Two-Axis Goniometric Sensor for Tracking Finger Motion.

Lefan Wang1, Turgut Meydan2, Paul Ieuan Williams3

  • 1Wolfson Centre for Magnetics, School of Engineering, Cardiff University, Cardiff CF24 3AA, Wales, UK. WangL54@cardiff.ac.uk.

Sensors (Basel, Switzerland)
|April 6, 2017
PubMed
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Researchers developed a novel two-axis optical sensor for precise finger motion tracking. This compact device accurately measures complex finger movements, overcoming limitations of existing hand tracking systems.

Area of Science:

  • Biomechanics
  • Sensor Technology
  • Human-Computer Interaction

Background:

  • Finger kinematics is crucial for understanding hand function.
  • Existing hand tracking systems often have limited functionality, primarily measuring one degree of freedom (flexion/extension).
  • Advanced finger motion tracking (abduction, adduction, circumduction) remains challenging.

Purpose of the Study:

  • To propose a novel two-axis 3D printed optical sensor for comprehensive finger motion tracking.
  • To overcome the limitations of current sensors in measuring multi-dimensional finger movements.
  • To achieve accurate and sensitive measurement of finger kinematics.

Main Methods:

  • Development of a compact, two-axis 3D printed optical sensor.
  • Utilizing Malus' law to analyze light attenuation through polarizing film for angular change detection.
Keywords:
3D printingabduction/adductionangle measurementfinger motion trackingflexion/extensionglove-based systemsoptical sensor

Related Experiment Videos

  • Implementing a weighted average approach to fuse readings from orthogonal sensor axes.
  • Attaching the sensor to the index finger's metacarpophalangeal joint for real-time data acquisition.

    • Main Results:

    • The sensor achieved a measurement range of up to 180 degrees with improved sensitivity.
    • Demonstrated high accuracy (±0.3 degrees), high repeatability, and low hysteresis error.
    • Successfully recorded real-time finger movements including flexion/extension, abduction/adduction, and circumduction.

    Conclusions:

    • The proposed two-axis optical sensor effectively measures finger movements with two degrees of freedom.
    • The sensor offers a compact, accurate, and repeatable solution for finger kinematics.
    • Potential applications include advanced prosthetics, rehabilitation monitoring, and other body motion tracking systems.