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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

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Published on: November 7, 2016

Fiber-cavity ring-down temperature sensor using a transmissive configuration combined with the heterodyne detection

Keiji Kuroda, Taiki Ikeguchi, Hisaki Oka

|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.

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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.