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A conductive polymer sensor for measuring external finger forces.

T R Jensen1, R G Radwin, J G Webster

  • 1Department of Electrical and Computer Engineering, University of Wisconsin, Madison 53706.

Journal of Biomechanics
|January 1, 1991
PubMed
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Researchers developed a thin, durable force sensor for hand biomechanics and rehabilitation. This sensor accurately measures finger forces during grasp activities, aiding in understanding hand function and recovery.

Area of Science:

  • Biomechanics
  • Rehabilitation Engineering
  • Sensor Technology

Background:

  • Studying hand biomechanics and grasp is crucial for rehabilitation.
  • Existing sensors may lack durability, thinness, or adaptability to varied surfaces.
  • Accurate force measurement is needed for effective hand function assessment.

Purpose of the Study:

  • To construct and evaluate a thin, durable force sensor for hand applications.
  • To assess the sensor's performance in measuring grasp forces.
  • To explore its utility in hand injury rehabilitation and biomechanical studies.

Main Methods:

  • Modified conductive polymer pressure sensors with an epoxy dome.
  • Developed sensors with a 1.8 mm thickness and 12 mm active sensing area.

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  • Calibrated sensors on-hand using a strain gauge dynamometer for static and dynamic tasks.

    • Main Results:

    • Sensors demonstrated insensitivity to varying contact surfaces (25-1100 mm2) and curved surfaces.
    • Achieved a useful force range of 0-30 N with 1 N accuracy.
    • Sensor time constant was 0.54 ms; recommended on-hand calibration before each use.

    Conclusions:

    • The developed thin force sensor is suitable for studying hand biomechanics and grasp.
    • Its durability and adaptability make it valuable for hand injury rehabilitation.
    • On-hand calibration is necessary for consistent accuracy in force measurements.