Integration and Testing of a Three-Axis Accelerometer in a Woven E-Textile Sleeve for Wearable Movement Monitoring

Area of Science:

• Materials Science
• Wearable Technology
• Biomedical Engineering

Background:

• Wearable sensors are crucial for remote health monitoring and activity tracking.
• Integrating sensors seamlessly into textiles (e-textiles) offers comfort and unobtrusive data collection.
• Existing solutions often face challenges in durability, comfort, and invisibility.

Purpose of the Study:

• To present a novel method for integrating micro-accelerometers into textiles to create functional e-textiles.
• To develop a wearable e-textile sleeve for measuring joint bending angles.
• To validate the e-textile system's accuracy in activity recognition and step counting.

Main Methods:

• Utilized the smallest available accelerometer (2 mm × 2 mm × 0.95 mm) fully integrated into a woven fabric structure.
• Developed a wearable woven sleeve incorporating the e-textile sensor system.
• Compared e-textile measurements of elbow joint angles (0°–180°) against commercial bending sensors and a custom goniometer.
• Recorded knee joint angles during walking, running, and stair climbing on human subjects.

Main Results:

• The e-textile sensor system demonstrated high accuracy, with joint angle measurement errors below ~1% compared to reference devices.
• The system successfully identified different activity types (walking, running, stair climbing).
• Minimum and maximum knee joint angles were determined for each activity, enabling accurate step counting.

Conclusions:

• The developed e-textile offers a highly accurate and comfortable solution for wearable joint angle monitoring.
• The invisible integration of sensors within textiles paves the way for advanced smart clothing applications.
• This technology provides a reliable platform for activity recognition and quantitative biomechanical analysis.