Strain transferring analysis of fiber Bragg grating sensors
- 1 February 2006
- journal article
- Published by SPIE-Intl Soc Optical Eng in Optical Engineering
- Vol. 45 (2), 024402-024402-8
- https://doi.org/10.1117/1.2173659
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.Keywords
This publication has 12 references indexed in Scilit:
- Recent applications of fiber optic sensors to health monitoring in civil engineeringEngineering Structures, 2004
- Structural monitoring of composite marine piles using fiber optic sensorsPublished by SPIE-Intl Soc Optical Eng ,2001
- Structural health monitoring of innovative bridges in Canada with fiber optic sensorsSmart Materials and Structures, 2001
- Optical fiber sensors for spacecraft applicationsSmart Materials and Structures, 1999
- Mechanics of Bond and Interface Shear Transfer in Optical Fiber SensorsJournal of Engineering Mechanics, 1998
- Fiber grating sensorsJournal of Lightwave Technology, 1997
- Fiber Bragg grating technology fundamentals and overviewJournal of Lightwave Technology, 1997
- Longitudinal shear transfer in fiber optic sensorsSmart Materials and Structures, 1992
- The study of model polydiacetylene/epoxy compositesJournal of Materials Science, 1984
- The elasticity and strength of paper and other fibrous materialsBritish Journal of Applied Physics, 1952