Flexible Segmented Assemblable Fiber Optic Sensor for Human Multi-Joint Monitoring

Area of Science:

• Biomedical Engineering
• Wearable Technology
• Sensor Development

Background:

• Accurate human joint motion monitoring is crucial for diagnostics, rehabilitation, and human-computer interaction.
• Existing methods may lack flexibility, comfort, or customizability for diverse applications.

Purpose of the Study:

• To develop and validate a flexible segmented assemblable fiber optic sensor (FSAFOS) for precise human multi-joint motion monitoring.
• To assess the sensor's performance in terms of stability, linearity, hysteresis, and accuracy.

Main Methods:

• Fabrication of the FSAFOS using miniature LEDs, segmented polymethyl methacrylate optical fibers, and photoconductive chips within a flexible cladding.
• Modular design with magnetic connectors for easy customization and assembly.
• Experimental validation of bending angle measurement accuracy and stability.

Main Results:

• The FSAFOS demonstrated high linearity (R² = 0.996), low hysteresis (<5%), and good stability.
• Accurate measurement of finger and spinal joint bending angles with errors under 1.85° compared to ground truth.
• The sensor maintained flexibility and comfort during testing.

Conclusions:

• The FSAFOS is a viable and advanced solution for human joint motion monitoring.
• Its modularity and accuracy offer significant potential for personalized posture monitoring and advanced human-machine interfaces.
• This technology advances biomechanical monitoring capabilities.