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Related Experiment Video

Updated: Jun 8, 2026

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
09:48

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

Published on: November 7, 2016

Cryogenic fluid level sensors multiplexed by frequency-shifted interferometry.

Fei Ye1, Tong Chen, Di Xu

  • 1Department of Electrical and Computer Engineering, University of Toronto, 10 King’s College Road, Toronto, Ontario M5S 3G4, Canada. fei.ye@utoronto.ca

Applied Optics
|September 11, 2010
PubMed
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This summary is machine-generated.

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A new liquid level sensing system uses fiber Bragg gratings in high-attenuation fibers, heated optically. This system accurately detects cryogenic fluid levels by distinguishing between liquid and gas thermal responses.

Area of Science:

  • Cryogenic Engineering
  • Optical Sensing Technologies
  • Materials Science

Background:

  • Accurate liquid level sensing is critical for cryogenic fluid management.
  • Traditional methods face challenges in harsh cryogenic environments.
  • Fiber optic sensing offers a robust alternative for extreme temperatures.

Purpose of the Study:

  • To develop and demonstrate a novel liquid level sensing system for cryogenic fluids.
  • To utilize the unique thermal properties of high-attenuation fibers for sensing.
  • To validate the system's performance using liquid nitrogen.

Main Methods:

  • An array of aluminum-coated fiber Bragg gratings (FBGs) in high-attenuation fibers (HAFs) was fabricated.
  • Optical heating of HAF sections was achieved through light absorption.

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Last Updated: Jun 8, 2026

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

Published on: November 7, 2016

Implementation of a Reference Interferometer for Nanodetection
16:11

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  • Frequency-shifted interferometry (FSI) was employed for sensor interrogation.
  • The distinct thermal responses in liquid versus gas phases were analyzed.

    • Main Results:

    • The system successfully differentiated between liquid and gas phases based on thermal response.
    • Experimental demonstration of liquid nitrogen level measurement was achieved.
    • FSI enabled overlapped spectral responses, allowing for a higher sensor density.

    Conclusions:

    • The developed system provides an unambiguous method for cryogenic liquid level detection.
    • The combination of aluminum-coated HAF FBGs and FSI is a promising solution.
    • This technology offers a viable approach for cryogenic sensor networks.