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

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


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.

Original languageEnglish
Title of host publicationMicro-Structured and Specialty Optical Fibres VII
EditorsKyriacos Kalli, Pavel Peterka, Christian-Alexander Bunge
ISBN (Electronic)9781510651562
StatePublished - 2022
EventMicro-Structured and Specialty Optical Fibres VII 2022 - Virtual, Online
Duration: 9 May 202220 May 2022

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceMicro-Structured and Specialty Optical Fibres VII 2022
CityVirtual, Online

Bibliographical note

Publisher Copyright:
© 2022 SPIE.


  • fiber optic sensors
  • fiber optics
  • forward Brillouin scattering
  • radiation dosimetry
  • structural health monitoring


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