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Radiation effects on optical frequency domain reflectometry fiber-based sensor.

S Rizzolo, E Marin, M Cannas

    Optics Letters
    |October 16, 2015
    PubMed
    Summary

    Germanosilicate optical fibers show reliable performance under radiation, even during recovery. Temperature changes during irradiation can cause errors in distributed measurements, highlighting the need for careful calibration in harsh environments.

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    Area of Science:

    • Materials Science
    • Optical Engineering
    • Radiation Physics

    Background:

    • Germanosilicate optical fibers are crucial for optical frequency domain reflectometry (OFDR).
    • Understanding their response to radiation is vital for deployment in harsh environments.
    • Existing setups lack precise temperature control during irradiation studies.

    Purpose of the Study:

    • To investigate the effects of 10 keV X-ray radiation on germanosilicate optical fibers used in OFDR.
    • To evaluate the impact of temperature variations (-40°C to 75°C) on fiber performance during and after irradiation.
    • To assess the reliability of Rayleigh scattering measurements under combined thermal and radiation stress.

    Main Methods:

    • Utilized a novel setup enabling simultaneous temperature control and X-ray irradiation.
    • Exposed germanosilicate optical fibers to 10 keV X-rays up to 1 MGy.
    • Monitored changes in Rayleigh scattering response at various fixed and changing temperatures.
    • Analyzed measurement reliability during irradiation and post-irradiation recovery phases.

    Main Results:

    • Optical fiber measurements remained reliable during irradiation and recovery at fixed temperatures.
    • Significant errors in distributed measurements were observed when irradiation temperature fluctuated.
    • The magnitude of measurement error was found to be dependent on the calibration method used.
    • Rayleigh scattering response showed susceptibility to temperature changes under irradiation.

    Conclusions:

    • Rayleigh-based optical fiber sensors demonstrate significant promise for use in demanding, high-radiation environments.
    • Precise temperature control and calibration procedures are critical for accurate distributed measurements in variable thermal conditions.
    • Further research into robust calibration techniques is recommended for reliable sensor deployment.