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Updated: Aug 5, 2025
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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
Published on: November 7, 2016
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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 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.
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.
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