Abstract
Theoretical Prediction and Experimental Measurement of Embedded Optical Fiber Strain Sensors
Highlights
Sensors and Materials, Vol 26, No 5 (2014)part of the energy would convert to shear deformation.(4) The strain measured using an embedded optical fiber is highly dependent on the bonding characteristics of the adhesive layer and protective coating as well as the bonded-fiber length
The longer the embedded-fiber length, the larger the coefficient of strain transformation, i.e., the greater the strain that is transferred to the optical fiber
The theoretical predictions were validated by the experimental results using a Mach-Zehnder interferometer
Summary
Part of the energy would convert to shear deformation.(4) The strain measured using an embedded optical fiber is highly dependent on the bonding characteristics of the adhesive layer and protective coating as well as the bonded-fiber length. Li et al(6) proposed an analytical model to characterize the strain transmission of surface-bonded FBG sensors. Her and Tsai(7) evaluated the strain in optical fiber sensors induced by the host structure. Owing to the existence of the adhesive layer and protective coating, the strain in the optical fiber is less than that in the host structure. In this investigation, a theoretical prediction of the strain transferred from the host material to the embedded optical fiber is presented to reveal the differential strain between the optical fiber sensor and the host material. Good agreement between the theoretical and experimental results shows that the proposed approach can provide an efficient method for calculating the strain in an optical fiber
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