NDLI: High-Temperature Resistance Fiber Bragg Grating Temperature Sensor Fabrication

Content Provider	IEEE Xplore Digital Library
Author	Bowei Zhang Kahrizi, M.
Copyright Year	2001
Abstract	Fiber Bragg grating (FBG) temperature sensor and sensor arrays were applied widespread particularly in harsh environments. Although FBGs are often referring to permanent refractive index modulation in the fiber core, exposure to high-temperature environments usually results in the bleach of the refractive index modulation. The maximum temperature reported for the conventional FBG temperature sensor is around 600 degC due to its weak bonds of germanium and oxygen. In this paper, we report design and development of a novel high-temperature resistance FBG temperature sensor, based on the hydrogen-loaded germanium-doped FBG. The refractive index modulation in the FBG is induced by the molecular water. The results of our experiments have shown that the stability of the device is substantially increased at high temperature range. Due to the high bonds energy of hydroxyl and the low diffusivity of the molecular water, the thermal testing results of this temperature sensor show the thermal stability of hydrogen-loaded FBG can be increased by using annealing treatment; moreover, the highest erasing temperature for the device could reach to 1100 degC or more. The reflectivity of this new FBG depends on the concentration of Si-OH and indirectly related to the reflectivity of hydrogen-loaded FBG. Furthermore, the experimental results have provided a better understanding of the formation of the hydrogen-loaded FBGs and the chemical transfers at elevated temperatures in the fiber core
Sponsorship	IEEE Sensors Council
Starting Page	586
Ending Page	591
Page Count	6
File Size	706633
File Format	PDF
ISSN	1530437X
Volume Number	7
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-04-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Temperature sensors Fabrication Fiber gratings Bragg gratings Sensor arrays Refractive index Reflectivity Optical fiber sensors Bleaching Germanium molecular-water induced FBGs Fiber Bragg grating (FBG) temperature sensors high-temperature resistance FBGs
Content Type	Text
Resource Type	Article
Subject	Instrumentation Electrical and Electronic Engineering

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