Optical Sensors

Strain transferring analysis of fiber Bragg grating sensors

[+] Author Affiliations
Dongsheng Li

Dalian University of Technology, Department of Civil and Hydraulic Engineering, State Key Laboratory of Coastal & Offshore Engineering, 116023, China

Hongnan Li

Dalian University of Technology, Department of Civil and Hydraulic Engineering, State Key Laboratory of Coastal & Offshore Engineering, 116023, China

Liang Ren

Dalian University of Technology, Department of Civil and Hydraulic Engineering, State Key Laboratory of Coastal & Offshore Engineering, 116023, China

Gangbing Song

Dalian University of Technology, Department of Civil and Hydraulic Engineering, State Key Laboratory of Coastal & Offshore Engineering, 116023, China

Opt. Eng. 45(2), 024402 (February 27, 2006). doi:10.1117/1.2173659
History: Received February 04, 2005; Revised June 15, 2005; Accepted July 01, 2005; Published February 27, 2006
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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.

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© 2006 Society of Photo-Optical Instrumentation Engineers

Citation

Dongsheng Li ; Hongnan Li ; Liang Ren and Gangbing Song
"Strain transferring analysis of fiber Bragg grating sensors", Opt. Eng. 45(2), 024402 (February 27, 2006). ; http://dx.doi.org/10.1117/1.2173659


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