Optomechanical measurements of optical fiber coating for radiation dosimetry and structural health monitoring

Shlomi Zilberman; Yosef London; Alon Bernstein; Kavita Sharma; Hilel H. Diamandi; Mirit Hen; Elad Zehavi; Gil Bashan; Garry Berkovic; Amnon Zentner; Moshe Mayoni; Ehud Shafir; Avi Zadok

doi:10.1117/12.2624394

19 May 2022 Optomechanical measurements of optical fiber coating for radiation dosimetry and structural health monitoring

Shlomi Zilberman, Yosef London, Alon Bernstein, Kavita Sharma, Hilel H. Diamandi, Mirit Hen, Elad Zehavi, Gil Bashan, Garry Berkovic, Amnon Zentner, Moshe Mayoni, Ehud Shafir, Avi Zadok

Author Affiliations +

Proceedings Volume 12140, Micro-Structured and Specialty Optical Fibres VII; 121400B (2022) https://doi.org/10.1117/12.2624394
Event: SPIE Photonics Europe, 2022, Strasbourg, France

Abstract

In this work, we demonstrate optomechanical measurements of radiation induced alterations of the acoustic velocity in a fluoroacrylate polymer coating of a silica optical fiber. The optomechanical measurement is based on forward Brillouin scattering initiated in the fiber core which stimulates acoustic waves that reach the fiber coating. The measurement may serve as an additional metric to quantify the dose of ionizing radiation to which the fiber was exposed. We have demonstrated that the stiffness of the coating increases following gamma irradiation, as measured by the time of flight of radial acoustic waves through the coating. The measurement was performed on few meters long fiber, but can be extended to a spatially distributed analysis in longer fibers. The tests showed a linear dependence of the acoustic time-of flight on the overall dosage of gamma irradiation. The time of flight decreased by as much as 15% following exposure to 180 Mrad from a 60Co source. In a follow-up study, we found that the stiffness of the previously exposed fiber coatings continued to slowly increase over months, after extraction from the radiation field. These results reveal the vulnerability of the specific coating to ionizing radiation and the potential complexities involved with dosimetry.

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Shlomi Zilberman, Yosef London, Alon Bernstein, Kavita Sharma, Hilel H. Diamandi, Mirit Hen, Elad Zehavi, Gil Bashan, Garry Berkovic, Amnon Zentner, Moshe Mayoni, Ehud Shafir, and Avi Zadok "Optomechanical measurements of optical fiber coating for radiation dosimetry and structural health monitoring", Proc. SPIE 12140, Micro-Structured and Specialty Optical Fibres VII, 121400B (19 May 2022); https://doi.org/10.1117/12.2624394

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