NDLI: An OTDR and Gratings Assisted Multifunctional Fiber Sensing System

Content Provider	IEEE Xplore Digital Library
Author	Xiangchuan Wang Zhijun Yan Feng Wang Ji Hua Chengbo Mou Zhongyuan Sun Xuping Zhang Lin Zhang
Copyright Year	2001
Abstract	We report a distributed multifunctional fiber sensing network based on weak-fiber Bragg gratings (WFBGs) and long period fiber grating (LPG) assisted OTDR system. The WFBGs are applied for temperature, strain, and vibration monitoring at key position, and the LPG is used as a linear filter in the system to convert the wavelength shift of WFBGs caused by environmental change into the power change. The simulation results show that it is possible to integrate more than 4472 WFBGs in the system when the reflectivity of WFBGs is less than 10-5. Besides, the back-Rayleigh scattering along the whole fiber can also be detected which makes distributed bend sensing possible. As an experimental demonstration, we have used three WFBGs UV-inscribed with 50-m interval at the end of a 2.6-km long fiber, which part was subjected for temperature, strain, and vibration sensing, respectively. The ratio of the intensity of output and input light is used for temperature and strain sensing, and the results show strain and temperature sensitivities are 4.2 × 10^-4/με and 5.9 × 10^-3/°C, respectively. Detection of multiple vibrations and single vibration with the broad frequency band up to 500 Hz are also achieved. In addition, distributed bend sensing which could be simultaneously realized in this system has been proposed.
Sponsorship	IEEE Sensors Council
Starting Page	4660
Ending Page	4666
Page Count	7
File Size	2306967
File Format	PDF
ISSN	1530437X
Volume Number	15
Issue Number	8
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Vibrations Temperature sensors Strain Optical fiber sensors Rayleigh scattering Fiber gratings Optical fiber gratings Optical fiber measurements Optical time domain reflectometry Vibration measurement optical fiber gratings optical time domain reflectometry vibration measurement
Content Type	Text
Resource Type	Article
Subject	Instrumentation Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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