Fiber Bragg gratings for low-temperature measurement

被引:53
作者
de Lima Filho, Elton Soares [1 ]
Baiad, Mohamad Diaa [2 ]
Gagne, Mathieu [1 ]
Kashyap, Raman [1 ,2 ]
机构
[1] Ecole Polytech, Dept Engn Phys, Stn Ctr Ville, Montreal, PQ H3C 3A7, Canada
[2] Ecole Polytech, Dept Elect Engn, Stn Ctr ville, Montreal, PQ H3C 3A7, Canada
来源
OPTICS EXPRESS | 2014年 / 22卷 / 22期
基金
加拿大自然科学与工程研究理事会;
关键词
OPTICAL WAVE-GUIDES; YBYAG CRYSTAL; SENSITIVITY; DEPENDENCE; STRESS; SENSOR; SILICA; COEFFICIENT; BEHAVIOR;
D O I
10.1364/OE.22.027681
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We demonstrate the use of fiber Bragg gratings (FBGs) as a monolithic temperature sensor from ambient to liquid nitrogen temperatures, without the use of any auxiliary embedding structure. The Bragg gratings, fabricated in three different types of fibers and characterized with a high density of points, confirm a nonlinear thermal sensitivity of the fibers. With a conventional interrogation scheme it is possible to have a resolution of 0.5 K for weak pure-silica-core FBGs and 0.25 K using both boron-doped and germanium-doped standard fibers at 77 K. We quantitatively show for the first time that the nonlinear thermal sensitivity of the FBG arises from the nonlinearity of both thermo-optic and thermal expansion coefficients, allowing consistent modeling of FBGs at low temperatures. (C) 2014 Optical Society of America
引用
收藏
页码:27681 / 27694
页数:14
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