Opto-Mechanical Fiber Sensing of Gamma Radiation

Yosef London, Kavita Sharma, Hagai Diamandi, Mirit Hen, Gil Bashan, Elad Zehavi, Shlomi Zilberman, Garry Berkovic, Amnon Zentner, Moshe Mayoni, Andrei Stolov, Mikhail Kalina, Olga Kleinerman, Ehud Shafir, Avi Zadok

Research output: Contribution to journalArticlepeer-review

Abstract

The monitoring of ionizing radiation is critical for the safe operation of nuclear and other high-power plants. Fiber-optic sensing of radiation has been pursued for over 45 years. Most protocols rely on radiation effects on the optical properties of the fiber. Here we propose a new concept, in which the opto-mechanics of standard fibers coated by thin layers of fluoroacrylate polymer are observed instead. The time-of-flight of radial acoustic waves through the coating is evaluated by forward stimulated Brillouin scattering measurements. The time-of-flight is seen to decrease monotonically with the overall dosage of gamma radiation from a cobalt source. Variations reach 15% of the initial value for 180 Mrad dose and remain stable for at least several weeks following exposure. The faster times-of-flight are consistent with a radiation-induced increase in the coating stiffness, observed in offline analysis. The effects on the coating are independent of possible changes in the optical parameters of the fiber. The combination of opto-mechanical analysis together with established fiber sensing protocols may help disambiguate the evaluation of multiple radiation metrics and reduce environmental cross-sensitivities. The technique is suitable for online monitoring and may be extended to spatially distributed measurements.

Original languageEnglish
Pages (from-to)6637-6645
Number of pages9
JournalJournal of Lightwave Technology
Volume39
Issue number20
DOIs
StatePublished - 15 Oct 2021

Keywords

  • Coatings
  • nonlinear fiber-optics
  • optical fiber sensors
  • opto-mechanics
  • radiation monitoring
  • stimulated Brillouin scattering

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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