Transverse strain sensitivity of fiber Bragg grating sensors

Mohanraj Prabhugoud; Kara Peters

doi:10.1117/12.598844

16 May 2005 Transverse strain sensitivity of fiber Bragg grating sensors

Mohanraj Prabhugoud, Kara Peters

Proceedings Volume 5758, Smart Structures and Materials 2005: Smart Sensor Technology and Measurement Systems; (2005) https://doi.org/10.1117/12.598844
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2005, San Diego, California, United States

Abstract

This article presents an integrated formulation for the calculation of the spectral response of a fiber Bragg grating sensor embedded in a host material system, as a function of the loading applied to the host structure. In particular, the calculation of the transverse strain sensitivity of a fiber Bragg grating sensor through the calculation of the change in effective index (or indices) of refraction of the fiber cross-section due to the applied load is presented in detail. For the calculation of the fiber propagation constants, a two-step finite element formulation is used moeling the optical, geometric and material properties of the cross-section. Once the propagation constants and principle optical axes are known along the fiber, a modified transfer matrix method is applied to calculate the spectral response of the FBG. It is shown that the inclusion of the change in index of refraction throughout the cross-section yields close agreement with previous methods. However the current method provides the potential to evaluate the effects of high strain gradients across the optical fiber core for some loading applications.

Citation Download Citation

Mohanraj Prabhugoud and Kara Peters "Transverse strain sensitivity of fiber Bragg grating sensors", Proc. SPIE 5758, Smart Structures and Materials 2005: Smart Sensor Technology and Measurement Systems, (16 May 2005); https://doi.org/10.1117/12.598844

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