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Title: Special optical fiber design to reduce reflection peak distortion of a FBG embedded in inhomogeneous material
Authors: Cheng, LK
Toet, P
De, VJ
Nieuwland, R
Tse, MLV
Tam, H 
Keywords: Composite
Fiber Bragg Grating
Fiber optic sensor
Structural health monitoring
Issue Date: 2014
Publisher: SPIE-International Society for Optical Engineering
Source: Proceedings of SPIE : the International Society for Optical Engineering, 2014, v. 9059, 90590L How to cite?
Journal: Proceedings of SPIE : the International Society for Optical Engineering 
Abstract: During the last decades, the use of optical fiber for sensing applications has gained increasing acceptance because of its unique properties of being intrinsically safe, unsusceptible to EMI, potentially lightweight and having a large operational temperature range. Among the different Fiber Optic sensor types, Fiber Bragg Grating (FBG) is most widely used for its unique multiplexing potential and the possibility of embedding in composite material for Structural Health Monitoring. When the fiber is embedded in an inhomogeneous environment, typically a material composed of filler and base material of different stiffness, local stiff material will generate extra lateral load to the fiber. Via the Poisson effect, this will be converted to a local axial strain. The narrow and sharp peak in the reflection spectrum of an FBG sensor relies on the constant periodicity of the grating. An inhomogeneous axial strain distribution will result in distortion or broadening of the FBG reflection spectrum. For the FBG strain sensitivity of about 1.2pm/με,the spectral distortion can be disastrous for strain measurements. A fiber design to tackle this critical problem is presented. Finite Element Modeling is performed to demonstrate the effectiveness of the solution. Modeling with different configurations has been performed to verify the influence of the design. The deformation of the core in the special fiber depends on the design. For a particular configuration, the core deformation in the axial direction is calculated to be a factor of 10 lower than that of a standard fiber. The first prototype fiber samples were drawn and the manufacturing of FBG in this special fiber using the phase mask method was demonstrated successfully.
Description: Industrial and Commercial Applications of Smart Structures Technologies 2014, San Diego, CA, 11-12 March 2014
ISBN: 9780819499851
ISSN: 0277-786X
EISSN: 1996-756X
DOI: 10.1117/12.2052872
Appears in Collections:Conference Paper

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