Temperature and Lateral Pressure Sensing Using a Sagnac Sensor Based on Cascaded Tilted Grating and...

Area of Science:

• Photonics and Optical Sensing
• Fiber Optic Sensors
• Interferometry

Background:

• Fiber optic sensors are crucial for measuring physical parameters.
• Sagnac Interferometers offer unique sensing properties.
• Tilted Fiber Bragg Gratings provide multi-modal sensing capabilities.

Purpose of the Study:

• To develop a dual-parameter fiber optic sensor for simultaneous strain and lateral pressure measurement.
• To enhance the sensitivity and accuracy of Sagnac Interferometer-based sensors.
• To investigate the integration of Polarization-Maintaining Fibers and Tilted Fiber Bragg Gratings.

Main Methods:

• A Sagnac Interferometer was constructed using Polarization-Maintaining Fibers.
• A 6° Tilted Fiber Bragg Grating was integrated into the Sagnac Interferometer.
• The sensor's response to varying strain and lateral pressure was experimentally characterized.
• Temperature sensitivity was also evaluated.

Main Results:

• The integrated sensor demonstrated enhanced sensitivity for dual-parameter measurements.
• Specific sensitivities were measured: -1.413 nm/°C for temperature and -4.264 dB/kPa for lateral pressure.
• Experimental results showed excellent repeatability and high precision.
• The sensor achieved advanced multi-parameter sensing capabilities.

Conclusions:

• The developed Sagnac Interferometer fiber sensor effectively measures strain and lateral pressure simultaneously.
• The integration of PMFs and TFBG significantly improves sensor performance.
• The sensor shows great potential for robust and accurate multi-parameter sensing applications in various fields.