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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

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Published on: November 7, 2016

Fiber Optic Temperature Sensor System Using Air-Filled Fabry-Pérot Cavity with Variable Pressure.

Hasanur R Chowdhury¹, Ming Han¹

¹Electrical and Computer Engineering Department, Michigan State University, East Lansing, MI 48824, USA.

Sensors (Basel, Switzerland)

|March 30, 2023

Summary

This summary is machine-generated.

This study presents a high-resolution fiber optic temperature sensor. Utilizing an air-filled Fabry-Pérot (FP) cavity, it achieves precise temperature measurements up to 800°C with excellent stability.

Keywords:

Fabry–Pérot interferometer fiber optic sensor resolution temperature measurement

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Area of Science:

Optics and Photonics
Sensor Technology
Materials Science

Background:

Fiber optic sensors offer advantages in harsh environments.
Accurate temperature sensing is crucial in various industrial and scientific applications.
Fabry-Pérot (FP) cavities are sensitive to environmental changes, including pressure and temperature.

Purpose of the Study:

To develop and demonstrate a high-resolution fiber optic temperature sensor system.
To investigate the use of an air-filled FP cavity for absolute temperature measurement.
To analyze the impact of pressure variation and wavelength resolution on temperature sensing accuracy.

Main Methods:

Fabrication of an air-filled FP cavity using fused-silica and single-mode/side-hole fibers.
Utilizing spectral fringe shifts caused by controlled pressure variations within the cavity.
Developing a computer-controlled pressure system and sensor interrogation system for precise measurements.
Analyzing the relationship between wavelength resolution, pressure fluctuation, and temperature measurement resolution.

Main Results:

Achieved high wavelength resolution (<0.2 pm) and minimal pressure fluctuation (~0.015 kPa).
Demonstrated high-resolution temperature measurement with an accuracy of ±0.32 ℃.
Validated sensor stability through thermal cycle testing up to 800 ℃.

Conclusions:

The developed fiber optic FP sensor system enables high-resolution absolute temperature measurements.
Precise control over cavity pressure and high spectral resolution are key to accurate sensing.
The sensor exhibits excellent stability and potential for high-temperature applications.