Differential Reflectometry of Fiber Bragg Gratings

A reflectometric approach is proposed for interrogation of multiple fiber Bragg grating (FBG) sensors recorded in a single fiber optic line, based on the differential registration FBGs’ response to a short probing laser pulse using conventional OTDR. A special optical layout has been developed allow...

Full description

Saved in:
Bibliographic Details
Published in:Key engineering materials 2010-01, Vol.437, p.324-328
Main Authors: Kulchin, Yuriy Nikolaevich, Dyshlyuk, Anton V., Babin, Sergey A., Vlasov, Alexander A., Vitrik, Oleg B., Shalagin, Anatoly M.
Format: Article
Language:English
Subjects:
Bragg gratings
Fiber optics
Fibers
Fluctuation
Interrogation
Lasers
Optical fibers
Reflectometry
Sensors
Spectra
Thresholds
Transformations
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A reflectometric approach is proposed for interrogation of multiple fiber Bragg grating (FBG) sensors recorded in a single fiber optic line, based on the differential registration FBGs’ response to a short probing laser pulse using conventional OTDR. A special optical layout has been developed allowing transformation of FBG’s spectrally modulated signals into intensity modulated signals and at the same time eliminating the susceptibility of the system to light power fluctuations. Threshold sensitivity of the method amounted to ~50 μstrain within the measurement range of ~4000 μstrain. The maximum number of FBGs interrogated by the proposed technique is estimated at several hundred, which by far surpasses the requirements of most practical applications. Due to its simplicity, efficiency and usage of conventional OTDR equipment the proposed FBG interrogation technique can find a wide range of applications, in particular in structural health monitoring.
ISSN:1013-9826
1662-9795
1662-9795
DOI:10.4028/www.scientific.net/KEM.437.324