Fiber-based Miniature Strain Sensor with Fast Response and Low Hysteresis

Area of Science:

• Materials Science
• Sensor Technology
• Mechanical Engineering

Background:

• Flexible and stretchable strain sensors are crucial for applications like sports performance monitoring, structural health monitoring, and biomedical uses.
• Existing soft sensors based on polymer materials often exhibit high hysteresis, low durability, and slow response times, limiting their practical utility.
• There is a significant demand for advanced stretchable sensors that overcome these limitations.

Purpose of the Study:

• To develop a novel stretchable miniature fiber sensor with enhanced performance characteristics.
• To address the drawbacks of current soft strain sensors, including hysteresis, durability, and response speed.
• To explore the potential applications of the developed sensor in wearable devices and safety monitoring systems.

Main Methods:

• A stretchable miniature fiber sensor was fabricated using a stretchable core tightly coiled with parallel conductive wires.
• The capacitive sensor response was analyzed using a derived analytical expression.
• Experimental validation and numerical simulations were conducted to confirm the sensor's performance.
• The sensor was integrated into wearable devices (belts, gloves, knee protectors) and monitoring systems (bladder, safety rope).

Main Results:

• The developed fiber sensor demonstrates flexibility, stretchability, and low hysteresis.
• It achieves a high theoretical resolution of 0.015% and a rapid response time of less than 30 milliseconds.
• The sensor exhibits excellent stability, enduring over 16,000 cycles of testing.
• The analytical expression for capacitive sensor response showed good agreement with experimental and simulation results.

Conclusions:

• The novel stretchable miniature fiber sensor offers superior performance compared to existing soft sensors.
• Its high resolution, fast response, and durability make it suitable for demanding applications.
• The sensor's versatility is confirmed through successful integration into wearable devices and monitoring systems.
• This technology holds significant promise for sports performance evaluation, healthcare monitoring, and structural safety assessments.