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Design of a Plantar Pressure Insole Measuring System Based on Modular Photoelectric Pressure Sensor Unit.

Bin Ren1, Jianwei Liu1

  • 1Shanghai Key Laboratory of Intelligent Manufacturing and Robotics, School of Mechatronic Engineering and Automation, Shanghai University, Shanghai 200444, China.

Sensors (Basel, Switzerland)
|June 2, 2021
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Summary

Researchers developed a low-cost, modular photoelectric sensor insole to capture detailed human walking data. This innovative insole provides reliable gait and posture information for advanced wearable systems like exoskeletons.

Keywords:
gait parametersmodular sensing unitoptical sensing principleplantar pressure measurement

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Area of Science:

  • Biomedical Engineering
  • Wearable Technology
  • Robotics

Background:

  • Accurate human walking parameter perception is crucial for man-machine cooperative control systems, including exoskeletons and power prostheses.
  • Plantar pressure data offers rich gait and posture information, essential for exoskeleton control system input.
  • Designing reliable, convenient, and non-interfering pressure-sensing insoles presents significant challenges.

Purpose of the Study:

  • To develop a low-cost, modular sensing unit based on photoelectric sensing principles.
  • To design and validate a plantar pressure-sensing insole for capturing human walking gait and posture information.
  • To evaluate the feasibility of modular sensor units for fabricating customized insole solutions.

Main Methods:

  • Developed modular sensor units using commercial flexible circuits and elastic silicone.
  • Evaluated sensor unit characteristics (mechanical, electrical, response time, hysteresis) using a self-developed calibration system.
  • Analyzed plantar pressure distribution and fabricated/compared multiple insole solutions.
  • Collected and analyzed time-series sensor data during dynamic locomotion experiments.

Main Results:

  • The photoelectric sensing modular sensor unit demonstrated fast response and negligible hysteresis.
  • The pressure-sensing insole successfully captured plantar pressure distribution by sensing insole deformation during locomotion.
  • The modular design facilitates convenient fabrication of diverse insole solutions.
  • Reliable gait information was obtained for wearable applications.

Conclusions:

  • The developed low-cost, modular photoelectric sensor insole effectively captures human gait and posture information.
  • This technology offers a reliable data source for exoskeleton and prosthetic control systems.
  • The modular design provides flexibility for creating tailored wearable sensing solutions.