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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
PubMed
Summary
This summary is machine-generated.

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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.
Keywords:
Fabry–Pérot interferometerfiber optic sensorresolutiontemperature measurement

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  • 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.