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Improved-bonding linearly chirped fiber grating for a high-sensitivity surface-mounted strain sensor
Gwo-Shyang Hwang1, Ding-Wei Huang, Chien-Ching Ma
1Department of Mechanical Engineering, National Taiwan University, Section 4, Number 1, Roosevelt Road, Taipei 106, Taiwan.
Applied Optics
|June 12, 2010
Summary
This study introduces an improved fiber Bragg grating sensor that enhances sensitivity and simplifies calibration. The new formula addresses limitations in previous surface-mounted strain sensors.
Area of Science:
- Sensor Technology
- Optical Fiber Sensing
- Materials Science
Background:
- Surface-mounted fiber grating strain sensors are crucial for structural health monitoring.
- Previous research has not simultaneously optimized sensitivity enhancement and calibration convenience.
- Addressing both aspects is vital for competitive sensor performance.
Purpose of the Study:
- To develop a novel fiber Bragg grating sensor system.
- To simultaneously enhance strain sensor sensitivity and calibration convenience.
- To provide a practical solution for surface-mounted strain sensing applications.
Main Methods:
- Utilized coupled-mode theory to calculate voltage signals.
- Simulated a filtered spectral-power interrogation system.
- Analyzed fiber Bragg gratings under varied strain fields (average strain and strain gradient).
Main Results:
- Calculated voltage signals for glued and glue-free gratings under a 1D linearly varied strain field.
- Identified key parameters influencing sensor performance.
- Developed a formula for an improved-bonding linearly chirped fiber grating.
Conclusions:
- The proposed improved-bonding linearly chirped fiber grating achieves both enhanced sensitivity and calibration convenience.
- This approach offers a significant advancement for surface-mounted fiber grating strain sensors.
- The developed formula provides a simple and effective method for sensor optimization.
