Temperature-insensitive optical fiber strain sensor with ultra-low detection limit based on capillary-taper...

Area of Science:

• Optoelectronics
• Fiber optic sensing
• Materials science

Background:

• Fiber optic sensors are crucial for measuring physical parameters.
• Temperature crosstalk and sensitivity limitations hinder current sensor accuracy.
• A compensation structure is needed to improve sensor performance.

Purpose of the Study:

• To propose and validate a novel optical fiber strain sensor.
• To achieve ultra-low temperature crosstalk and high strain sensitivity.
• To demonstrate the sensor's potential for precise strain detection.

Main Methods:

• Theoretical simulation using finite element analysis (FEA).
• Design of a capillary-taper compensation structure.
• Development of a high-accuracy insertion controller system.
• Experimental validation of sensor performance.

Main Results:

• FEA identified a matching condition for zero temperature crosstalk and enhanced sensitivity.
• The developed sensor achieved ultra-low temperature crosstalk (0.05 pm/°C).
• Ultra-high strain sensitivity (214.35 pm/µε) and an ultra-low detection limit (0.047 µε) were experimentally verified.
• Experimental results closely matched theoretical calculations.

Conclusions:

• The proposed capillary-taper compensation structure effectively minimizes temperature crosstalk.
• The sensor demonstrates superior strain sensitivity and detection limits.
• This technology offers a promising solution for accurate and reliable strain monitoring.