Multicore optical fiber shape sensors suitable for use under gamma radiation

被引：26
作者：
Barrera, David [1 ]
Madrigal, Javier [2 ]
Delepine-Lesoille, Sylvie [3 ]
Sales, Salvador [2 ]
机构：
[1] Univ Alcala, Dept Elect, Edificio Politecn Super, Alcala De Henares 28805, Spain
[2] Univ Politecn Valencia, ITEAM Res Inst, Camino Vera S-N, E-46022 Valencia, Spain
[3] Andra, 1-7 Rue Jean Monnet, F-92298 Chatenay Malabry, France
来源：
OPTICS EXPRESS | 2019年 / 27卷 / 20期
基金：
欧盟地平线“2020”;
关键词：
BRAGG GRATINGS;
D O I：
10.1364/OE.27.029026
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We have designed and implemented a fiber optic shape sensor for high-energy ionizing environments based on multicore optical fibers. We inscribed two fiber Bragg gratings arrays in a seven-core optical fiber. One of the arrays has been inscribed in a hydrogen-loaded fiber and the other one in an unloaded fiber in order to have two samples with very different radiation sensitivity. The two samples were coiled in a metallic circular structure and were exposed to gamma radiation. We have analyzed the permanent radiation effects. The radiation-induced Bragg wavelength shift (RI-BWS) in the hydrogen-loaded fiber is near ten times higher than the one observed for the unloaded fiber, with a maximum wavelength shift of 415 pm. However, the use of the multiple cores permits to make these sensors immune to RI-BWS obtaining a similar curvature error in both samples of approximately 1 cm without modifying the composition of the fiber, pre-irradiation or thermal treatment. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
引用
收藏
页码：29026 / 29033
页数：8
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