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Fiber Bragg grating cryogenic temperature sensors.

S Gupta, T Mizunami, T Yamao

    Applied Optics
    |November 25, 2010
    PubMed
    Summary

    This study demonstrates low-temperature fiber Bragg grating (FBG) sensors for precise temperature sensing down to 80 K. Different substrates showed varying sensitivities, impacting FBG wavelength shifts for accurate cryogenic measurements.

    Area of Science:

    • Optoelectronics
    • Materials Science
    • Cryogenics

    Background:

    • Fiber Bragg gratings (FBGs) are widely used for sensing applications.
    • Accurate temperature monitoring is crucial in cryogenic environments.
    • Understanding FBG behavior at low temperatures is essential for advanced applications.

    Purpose of the Study:

    • To demonstrate temperature sensing using 1.55-μm FBGs at temperatures as low as 80 K.
    • To investigate the effect of different substrates on FBG temperature sensitivity at cryogenic temperatures.
    • To analyze the factors contributing to reduced sensitivity at low temperatures.

    Main Methods:

    • Fabrication of 1.55-μm fiber Bragg gratings.
    • Bonding FBGs onto aluminum and poly(methyl methacrylate) substrates.

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  • Measuring reflection wavelength shifts in response to temperature changes from 80 K to room temperature.
  • Analyzing the temperature sensitivity based on substrate material.

    • Main Results:

    • Successful demonstration of temperature sensing with FBGs down to 80 K.
    • Measured temperature sensitivities of 0.02 nm/K (aluminum substrate) and 0.04 nm/K (PMMA substrate) at 100 K.
    • Observed lower sensitivities at cryogenic temperatures compared to room temperature due to nonlinear thermal expansion and thermo-optic effects.
    • Discussion on the potential for extension to liquid helium temperatures.

    Conclusions:

    • FBGs can be effectively utilized for low-temperature sensing applications.
    • Substrate selection significantly influences FBG temperature sensitivity in cryogenic regimes.
    • Nonlinear material properties at low temperatures must be considered for accurate FBG-based thermometry.