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Article

Numerical Analysis of Radiation Effects on Fiber Optic Sensors

1
Department of Electrical and Computer Engineering, Boise State University, Boise, ID 83725, USA
2
Idaho National Laboratory, 1955 N Fremont Avenue, Idaho Falls, ID 83415, USA
*
Author to whom correspondence should be addressed.
Academic Editors: Agostino Iadicicco, Stefania Campopiano, Andrei Stancalie and Flavio Esposito
Sensors 2021, 21(12), 4111; https://doi.org/10.3390/s21124111
Received: 13 May 2021 / Revised: 10 June 2021 / Accepted: 12 June 2021 / Published: 15 June 2021
(This article belongs to the Special Issue Optical Fiber Sensors in Radiation Environments)
Optical fiber sensors (OFS) are a potential candidate for monitoring physical parameters in nuclear environments. However, under an irradiation field the optical response of the OFS is modified via three primary mechanisms: (i) radiation-induced attenuation (RIA), (ii) radiation-induced emission (RIE), and (iii) radiation-induced compaction (RIC). For resonance-based sensors, RIC plays a significant role in modifying their performance characteristics. In this paper, we numerically investigate independently the effects of RIC and RIA on three types of OFS widely considered for radiation environments: fiber Bragg grating (FBG), long-period grating (LPG), and Fabry-Perot (F-P) sensors. In our RIC modeling, experimentally calculated refractive index (RI) changes due to low-dose radiation are extrapolated using a power law to calculate density changes at high doses. The changes in RI and length are subsequently calculated using the Lorentz–Lorenz relation and an established empirical equation, respectively. The effects of both the change in the RI and length contraction on OFS are modeled for both low and high doses using FIMMWAVE, a commercially available vectorial mode solver. An in-depth understanding of how radiation affects OFS may reveal various potential OFS applications in several types of radiation environments, such as nuclear reactors or in space. View Full-Text
Keywords: fiber Bragg grating (FBG); long-period grating (LPG); Fabry-Perot (F-P); radiation effects; optical fiber sensors fiber Bragg grating (FBG); long-period grating (LPG); Fabry-Perot (F-P); radiation effects; optical fiber sensors
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MDPI and ACS Style

Rana, S.; Subbaraman, H.; Fleming, A.; Kandadai, N. Numerical Analysis of Radiation Effects on Fiber Optic Sensors. Sensors 2021, 21, 4111. https://doi.org/10.3390/s21124111

AMA Style

Rana S, Subbaraman H, Fleming A, Kandadai N. Numerical Analysis of Radiation Effects on Fiber Optic Sensors. Sensors. 2021; 21(12):4111. https://doi.org/10.3390/s21124111

Chicago/Turabian Style

Rana, Sohel, Harish Subbaraman, Austin Fleming, and Nirmala Kandadai. 2021. "Numerical Analysis of Radiation Effects on Fiber Optic Sensors" Sensors 21, no. 12: 4111. https://doi.org/10.3390/s21124111

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