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FBG Interrogation Method with High Resolution and Response Speed Based on a Reflective-Matched FBG Scheme.
Jiwen Cui1, Yang Hu2, Kunpeng Feng3
1Institute of Ultra-precision Optoelectronic Instrument Engineering, Science Park, Harbin Institute of Technology, No. 2 Yikuang Street, Nangang District, Harbin 150080, China. cuijiwen@hit.edu.cn.
Sensors (Basel, Switzerland)
|July 18, 2015
Summary
This study presents an improved Fiber Bragg Grating (FBG) sensing interrogation method for high resolution and speed. Mechanical adjustments enhance stability and reduce temperature effects, achieving 0.3 pm resolution and 500 kHz response speed.
Area of Science:
- Photonics and Optical Sensing
- Fiber Optic Sensors
- Signal Processing
Background:
- Fiber Bragg Gratings (FBGs) are widely used for sensing applications.
- Existing FBG interrogation methods face challenges with resolution, response speed, and environmental stability.
- Nonlinearity and temperature sensitivity can limit the accuracy of FBG-based measurements.
Purpose of the Study:
- To investigate a high-resolution and fast-response interrogation method for reflective-matched FBG sensors.
- To address and solve the nonlinearity issues in FBG sensing interrogation.
- To enhance the stability and anti-temperature perturbation performance of the FBG interrogation system.
Main Methods:
- Developed and optimized a mathematical model for the reflective-matched FBG sensing interrogation scheme.
- Implemented a mechanical adjustment technique by tuning the central wavelength of a reference FBG.
- Designed and utilized a specialized acquisition circuit board for optical and electrical signal processing.
Main Results:
- Achieved an optical power resolution better than 8 pW with the acquisition circuit board.
- Demonstrated system stability of 0.06% with mechanical adjustment.
- Measured nonlinearity of 3.3% within a 60 pm range, reduced temperature influence to 9.5%, and attained 0.3 pm wavelength resolution and 500 kHz response speed.
Conclusions:
- The optimized reflective-matched FBG interrogation method significantly improves resolution, response speed, and stability.
- Mechanical adjustments effectively enhance anti-temperature perturbation performance.
- The developed system is suitable for demanding optical and electrical signal processing applications requiring high precision.
