0.5 mm spatial resolution distributed fiber temperature and strain sensor with position-deviation compensation based...

Area of Science:

• Optoelectronics
• Materials Science
• Sensor Technology

Background:

• Distributed fiber optic sensors offer remote and real-time monitoring capabilities.
• Achieving high spatial resolution in distributed sensing is challenging due to signal degradation.
• Existing methods struggle with accuracy at sub-millimeter resolutions.

Purpose of the Study:

• To develop a distributed fiber optic sensor with 0.5 mm spatial resolution.
• To implement position-deviation compensation for improved cross-correlation of Rayleigh spectra.
• To demonstrate the sensor's capability for precise temperature and strain measurements.

Main Methods:

• Utilizing Optical Frequency Domain Reflectometry (OFDR) for high-resolution sensing.
• Implementing a novel position-deviation compensation technique.
• Conducting experiments with gold-coated and polyimide-coated fibers for temperature and strain tests.

Main Results:

• Successfully demonstrated a 0.5 mm resolution distributed fiber sensor.
• Achieved 0.5 mm strained fiber segment recognition with 50,000 measurement points.
• Obtained temperature repeatability of ±0.9 °C and strain accuracy of ±15 µɛ.

Conclusions:

• The developed sensor achieves unprecedented spatial resolution for distributed fiber sensing.
• Position-deviation compensation is crucial for maintaining spectral correlation at high resolutions.
• The sensor is suitable for demanding applications in astronautics, advanced materials, and nuclear facilities.