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Optical Engineering

Strain transferring analysis of fiber Bragg grating sensors
Author(s): Dong-Sheng Li; Hongnan Li; Liang Ren; Gangbing Song
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Paper Abstract

We develop an analytical model for the relationship between the strain measured by a fiber Bragg grating sensor and the actual structural strain. The values of the average strain transfer rates calculated from the analytical model agree well with available experiment data. Based on the analytical model, the critical adherence length of an optical fiber sensor can be calculated and is determined by a strain lag parameter, which contains both the effects of the geometry and the relative stiffness of the structural components. The analysis shows that the critical adherence length of a fiber sensing segment is the minimum length with which the fiber must be tightly bonded to a structure for adequate sensing. The strain transfer rate of an optical fiber sensor embedded in a multilayered structure is developed in a similar way, and the factors that influence the efficiency of optical fiber sensor strain transferring are discussed. It is concluded that the strain sensed by a fiber Bragg grating must be magnified by a factor (strain transfer rate) to be equal to the actual structural strain. This is of interest for the application of fiber Bragg grating sensors.

Paper Details

Date Published: 1 February 2006
PDF: 8 pages
Opt. Eng. 45(2) 024402 doi: 10.1117/1.2173659
Published in: Optical Engineering Volume 45, Issue 2
Show Author Affiliations
Dong-Sheng Li, Dalian Univ. of Technology (China)
Hongnan Li, Dalian Univ. of Technology (China)
Liang Ren, Dalian Univ. of Technology (China)
Gangbing Song, Univ. of Houston (United States)

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