Deduced Refractive Index Profile Changes of Type i and Type II Gratings When Subjected to Ionizing Radiation

Anthony Birri; Brandon A. Wilson; Thomas E. Blue

doi:10.1109/JSEN.2019.2904013

Deduced Refractive Index Profile Changes of Type i and Type II Gratings When Subjected to Ionizing Radiation

Anthony Birri, Brandon A. Wilson, Thomas E. Blue

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

Type I and type II Bragg grating arrays in silica fiber have been irradiated at the Ohio State University Nuclear Reactor Laboratory in the gamma facility and the pool-Type reactor, to receive a relatively small gamma dose (2.82 Mrad) and a relatively large gamma-neutron dose (638 Mrad, {6\times }{10}^{17}\rm {({n}/{cm^{2}})} ), respectively. The Bragg grating fibers were first irradiated in the gamma facility and those same fibers were then subsequently irradiated in the reactor, while being monitored in situ by optical frequency domain reflectometry. The response of the Bragg gratings, in terms of reflected amplitude, was analyzed, both in the frequency and spatial domains. A Bragg grating modeling code, written in MATLAB, was then used to generate modeled fiber Bragg grating (FBG) responses to match the experimental responses, based on some fundamental assumptions. With the modeled responses, we were able to deduce the alterations to the refractive index profile of the Bragg grating inscribed fibers as a result of the irradiation.

Original language	English
Article number	8664486
Pages (from-to)	5000-5006
Number of pages	7
Journal	IEEE Sensors Journal
Volume	19
Issue number	13
DOIs	https://doi.org/10.1109/JSEN.2019.2904013
State	Published - Jul 1 2019
Externally published	Yes

Funding

Manuscript received January 14, 2019; revised March 1, 2019; accepted March 1, 2019. Date of publication March 11, 2019; date of current version June 4, 2019. This work was supported by the Department of Energy through the Nuclear Energy Enabling Technologies Program: Sensors and Instrumentation for Data Generation. The work of A. Birri was supported by the Department of Energy Integrated University Program Fellowship. The associate editor coordinating the review of this paper and approving it for publication was Dr. Carlos Marques. (Corresponding author: Anthony Birri.) The authors are with the Nuclear Engineering Program, Mechanical and Aerospace Department of Engineering, Ohio State University, Columbus, OH 43210 USA (e-mail: [email protected]; [email protected]; [email protected]). Digital Object Identifier 10.1109/JSEN.2019.2904013

Keywords

Silica optical fiber
fiber Bragg gratings
nuclear reactor

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title = "Deduced Refractive Index Profile Changes of Type i and Type II Gratings When Subjected to Ionizing Radiation",

abstract = "Type I and type II Bragg grating arrays in silica fiber have been irradiated at the Ohio State University Nuclear Reactor Laboratory in the gamma facility and the pool-Type reactor, to receive a relatively small gamma dose (2.82 Mrad) and a relatively large gamma-neutron dose (638 Mrad, {6\times }{10}^{17}\rm {({n}/{cm^{2}})} ), respectively. The Bragg grating fibers were first irradiated in the gamma facility and those same fibers were then subsequently irradiated in the reactor, while being monitored in situ by optical frequency domain reflectometry. The response of the Bragg gratings, in terms of reflected amplitude, was analyzed, both in the frequency and spatial domains. A Bragg grating modeling code, written in MATLAB, was then used to generate modeled fiber Bragg grating (FBG) responses to match the experimental responses, based on some fundamental assumptions. With the modeled responses, we were able to deduce the alterations to the refractive index profile of the Bragg grating inscribed fibers as a result of the irradiation.",

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Deduced Refractive Index Profile Changes of Type i and Type II Gratings When Subjected to Ionizing Radiation

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