All-fiber-optic remote sensing of temperature employing interferometric techniques

Area of Science:

• Fiber optics
• Optical sensing
• Interferometry

Background:

• Traditional temperature sensors face limitations in remote and multiplexed applications.
• The need for robust, high-precision temperature monitoring in various environments is growing.

Purpose of the Study:

• To develop an all-fiber interferometric temperature sensor for remote operation.
• To enable multiplexing of multiple sensing elements for distributed measurements.

Main Methods:

• Configuring the fiber's sensing element as a short Fabry-Perot cavity (<5 mm) at the fiber end.
• Utilizing a fiber coupler to address the sensing element for remote detection.
• Implementing multiplexing techniques for multi-point measurements.

Main Results:

• Demonstrated a functional all-fiber interferometric temperature sensor.
• Achieved remote operation capability with a lead fiber of arbitrary length.
• Successfully enabled multiplexing of multiple sensing elements.

Conclusions:

• The developed sensor offers a viable solution for remote and multi-point temperature sensing.
• The Fabry-Perot cavity configuration provides a compact and effective sensing element.
• The fiber optic approach ensures robustness and compatibility with existing fiber infrastructure.