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Air Gap Fiber Bragg Grating for Simultaneous Strain and Temperature Measurement
Fuling Yang1, Kehui Zhu1, Xiaoyi Yu1
1School of Mechanical and Electrical Engineering, China University of Mining and Technology, Beijing 100083, China.
Micromachines
|January 23, 2024
Summary
This study introduces an air gap fiber Bragg grating (g-FBG) sensor for simultaneous strain and temperature measurement. The novel sensor design offers a cost-effective solution for multi-parameter sensing applications.
Area of Science:
- Optoelectronics
- Fiber Optic Sensors
- Materials Science
Background:
- Accurate simultaneous measurement of strain and temperature is crucial for structural health monitoring and various industrial applications.
- Existing multi-parameter sensors often suffer from complex structures, high costs, or limited resolution.
- Fiber Bragg Gratings (FBGs) are widely used for sensing, but achieving simultaneous strain and temperature decoupling can be challenging.
Purpose of the Study:
- To propose and experimentally validate a novel air gap fiber Bragg grating (g-FBG) sensor capable of simultaneously measuring strain and temperature.
- To investigate the sensing principles based on combined phase-shifted fiber Bragg grating (PSFBG) and Fabry-Perot interference (FPI) spectroscopy.
- To evaluate the performance metrics, including sensitivity and resolution, of the proposed g-FBG sensor.
Main Methods:
- Fabrication of a g-FBG sensor by aligning two FBGs with a precisely controlled air gap between them.
- Utilizing the distinct spectral responses of PSFBG and FPI modes to strain and temperature variations.
- Analyzing the reflected spectrum to extract wavelength shifts from both PSFBG and FPI dips for independent parameter determination.
Main Results:
- The g-FBG sensor achieved a strain sensitivity of approximately 11.95 pm/με, measured via FPI dip wavelength detection.
- A temperature sensitivity of about 9.64 pm/°C was obtained through PSFBG dip wavelength detection.
- The sensor demonstrated a resolution of ±3.7 με for strain (0-1000 με) and ±0.6 °C for temperature (25-120 °C).
Conclusions:
- The proposed g-FBG sensor effectively enables simultaneous and independent measurement of strain and temperature.
- The sensor's simple structure, compact size, and cost-effectiveness make it highly suitable for practical multi-parameter sensing.
- This technology holds significant potential for advanced applications requiring precise environmental monitoring.
