材料科学
光纤布拉格光栅
聚合物
复合数
复合材料
涂层
波长
毛细管作用
温度测量
光纤
光学
低温学
光纤传感器
光电子学
纤维
物理
量子力学
作者
Umesh Sampath,Dae-gil Kim,Hyun‐Jin Kim,Minho Song
出处
期刊:Applied Optics
[The Optical Society]
日期:2018-01-18
卷期号:57 (3): 492-492
被引量:65
摘要
A polymer-coated fiber Bragg grating (PCFBG) is examined for real-time temperature and strain monitoring in composite materials at cryogenic temperatures. The proposed sensor enables the simultaneous measurement of temperature and strain at extremely low temperatures by tracking the changes in the reflected center wavelengths from a pair of PCFBGs embedded in a composite material. The cryogenic temperature sensing was realized by introducing polymer coatings onto bare FBGs, which resulted in high temperature sensitivity under cryogenic conditions. A comparison of wavelength responses of the Bragg grating with and without a polymer coating toward temperatures ranging from 25°C to -180°C was performed. The polymer-coated FBG exhibited a sensitivity of 48 pm/°C, which is 10 times greater than that of the bare FBGs. In addition, the encapsulation of the FBG in a capillary tube made it possible to evaluate the strain accumulated within the composite during operation under cryogenic conditions.
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