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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
Published on: November 7, 2016
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Fiber-cavity ring-down temperature sensor using a transmissive configuration combined with the heterodyne detection
Applied Optics
|January 31, 2024
Summary
This study introduces a novel fiber Bragg grating temperature sensor using cavity ring-down spectroscopy. The innovative quasi-linear fiber cavity and heterodyne detection achieve high-resolution temperature measurements with 0.01°C accuracy.
Area of Science:
- Optoelectronics
- Fiber optic sensing
- Spectroscopy
Background:
- Fiber Bragg gratings (FBGs) are widely used for sensing applications.
- Conventional FBG sensors often suffer from optical loss in resonant cavities.
- Cavity ring-down (CRD) spectroscopy offers high sensitivity for detecting weak optical signals.
Purpose of the Study:
- To develop a high-resolution fiber Bragg grating temperature sensor.
- To improve sensitivity and reduce optical loss in FBG-based CRD systems.
- To demonstrate precise temperature measurement using a novel cavity configuration.
Main Methods:
- Implementation of a quasi-linear fiber cavity to minimize optical loss.
- Application of the heterodyne detection technique for sensitive weak pulse detection.
- Utilizing the cavity ring-down technique for FBG wavelength shift measurement.
Main Results:
- Achieved a temperature resolution of approximately 0.01°C.
- Demonstrated sensitive detection of decaying pulse trains from the fiber cavity.
- Successfully correlated wavelength shift of the Bragg grating with temperature changes.
Conclusions:
- The proposed quasi-linear fiber cavity combined with heterodyne detection significantly enhances FBG temperature sensor performance.
- This approach enables high-resolution and sensitive temperature measurements.
- The developed sensor shows promise for various temperature monitoring applications requiring high precision.
