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Title: Radiation resistant fiber Bragg grating in random air-line fibers for sensing applications in nuclear reactor cores

Abstract

This paper reports the testing results of radiation resistant fiber Bragg grating (FBG) in random air-line (RAL) fibers in comparison with FBGs in other radiation-hardened fibers. FBGs in RAL fibers were fabricated by 80 fs ultrafast laser pulse using a phase mask approach. The fiber Bragg gratings tests were carried out in the core region of a 6 MW MIT research reactor (MITR) at a steady temperature above 600°C and an average fast neutron (>1 MeV) flux >1.2 × 1014 n/cm2/s. Fifty five-day tests of FBG sensors showed less than 5 dB reduction in FBG peak strength after over 1 × 1020 n/cm2 of accumulated fast neutron dose. The radiation-induced compaction of FBG sensors produced less than 5.5 nm FBG wavelength shift toward shorter wavelength. To test temporal responses of FBG sensors, a number of reactor anomaly events were artificially created to abruptly change reactor power, temperature, and neutron flux over short periods of time. The thermal sensitivity and temporal responses of FBGs were determined at different accumulated doses of neutron flux. Results presented in this paper reveal that temperature-stable Type-II FBGs fabricated in radiation-hardened fibers can survive harsh in-pile conditions. In conclusion, despite large parameter drift induced by strongmore » nuclear radiation, further engineering and innovation on both optical fibers and fiber devices could lead to useful fiber sensors for various in-pile measurements to improve safety and efficiency of existing and next generation nuclear reactors.« less

Authors:
; ; ; ; ; ORCiD logo; ; ; ; ; ; ;
Publication Date:
Research Org.:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1434407
Alternate Identifier(s):
OSTI ID: 1469356
Grant/Contract Number:  
FE-028992; 15-8489; M3CA-14-PA-PITT-0702-0320; AC07-05ID14517; FE028992
Resource Type:
Published Article
Journal Name:
Optics Express
Additional Journal Information:
Journal Name: Optics Express Journal Volume: 26 Journal Issue: 9; Journal ID: ISSN 1094-4087
Publisher:
Optical Society of America
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 22 GENERAL STUDIES OF NUCLEAR REACTORS

Citation Formats

Zaghloul, Mohamed A. S., Wang, Mohan, Huang, Sheng, Hnatovsky, Cyril, Grobnic, Dan, Mihailov, Stephen, Li, Ming-Jun, Carpenter, David, Hu, Lin-Wen, Daw, Joshua, Laffont, Guillaume, Nehr, Simon, and Chen, Kevin P. Radiation resistant fiber Bragg grating in random air-line fibers for sensing applications in nuclear reactor cores. United States: N. p., 2018. Web. doi:10.1364/OE.26.011775.
Zaghloul, Mohamed A. S., Wang, Mohan, Huang, Sheng, Hnatovsky, Cyril, Grobnic, Dan, Mihailov, Stephen, Li, Ming-Jun, Carpenter, David, Hu, Lin-Wen, Daw, Joshua, Laffont, Guillaume, Nehr, Simon, & Chen, Kevin P. Radiation resistant fiber Bragg grating in random air-line fibers for sensing applications in nuclear reactor cores. United States. https://doi.org/10.1364/OE.26.011775
Zaghloul, Mohamed A. S., Wang, Mohan, Huang, Sheng, Hnatovsky, Cyril, Grobnic, Dan, Mihailov, Stephen, Li, Ming-Jun, Carpenter, David, Hu, Lin-Wen, Daw, Joshua, Laffont, Guillaume, Nehr, Simon, and Chen, Kevin P. Tue . "Radiation resistant fiber Bragg grating in random air-line fibers for sensing applications in nuclear reactor cores". United States. https://doi.org/10.1364/OE.26.011775.
@article{osti_1434407,
title = {Radiation resistant fiber Bragg grating in random air-line fibers for sensing applications in nuclear reactor cores},
author = {Zaghloul, Mohamed A. S. and Wang, Mohan and Huang, Sheng and Hnatovsky, Cyril and Grobnic, Dan and Mihailov, Stephen and Li, Ming-Jun and Carpenter, David and Hu, Lin-Wen and Daw, Joshua and Laffont, Guillaume and Nehr, Simon and Chen, Kevin P.},
abstractNote = {This paper reports the testing results of radiation resistant fiber Bragg grating (FBG) in random air-line (RAL) fibers in comparison with FBGs in other radiation-hardened fibers. FBGs in RAL fibers were fabricated by 80 fs ultrafast laser pulse using a phase mask approach. The fiber Bragg gratings tests were carried out in the core region of a 6 MW MIT research reactor (MITR) at a steady temperature above 600°C and an average fast neutron (>1 MeV) flux >1.2 × 1014 n/cm2/s. Fifty five-day tests of FBG sensors showed less than 5 dB reduction in FBG peak strength after over 1 × 1020 n/cm2 of accumulated fast neutron dose. The radiation-induced compaction of FBG sensors produced less than 5.5 nm FBG wavelength shift toward shorter wavelength. To test temporal responses of FBG sensors, a number of reactor anomaly events were artificially created to abruptly change reactor power, temperature, and neutron flux over short periods of time. The thermal sensitivity and temporal responses of FBGs were determined at different accumulated doses of neutron flux. Results presented in this paper reveal that temperature-stable Type-II FBGs fabricated in radiation-hardened fibers can survive harsh in-pile conditions. In conclusion, despite large parameter drift induced by strong nuclear radiation, further engineering and innovation on both optical fibers and fiber devices could lead to useful fiber sensors for various in-pile measurements to improve safety and efficiency of existing and next generation nuclear reactors.},
doi = {10.1364/OE.26.011775},
journal = {Optics Express},
number = 9,
volume = 26,
place = {United States},
year = {Tue Apr 24 00:00:00 EDT 2018},
month = {Tue Apr 24 00:00:00 EDT 2018}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1364/OE.26.011775

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Cited by: 26 works
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Works referencing / citing this record:

On-line monitoring of sealing glass in electrical penetration assembly based on femto-laser inscribed fiber Bragg grating sensors
journal, January 2019

  • Fan, Zhichun; Diao, Xingzhong; Liu, Malin
  • Optics Express, Vol. 27, Issue 2
  • DOI: 10.1364/oe.27.000608