Numerical investigation on arbitrary strain distribution sensing with fiber Bragg grating-based Sagnac interferometer and genetic algorithm

Hsu-Chih Cheng; Jen-Fa Huang; Yu-Lung Lo

doi:10.1117/1.2404603

1 December 2006 Numerical investigation on arbitrary strain distribution sensing with fiber Bragg grating-based Sagnac interferometer and genetic algorithm

Hsu-Chih Cheng, Jen-Fa Huang, Yu-Lung Lo

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Optical Engineering, Vol. 45, Issue 12, 124401 (December 2006). https://doi.org/10.1117/1.2404603

Abstract

This study presents a numerical investigation into a novel approach for the inverse measurement of arbitrary strain distributions using a genetic algorithm (GA) and a fiber-Bragg-grating-based Sagnac interferometer. In the proposed method, a single uniform fiber Bragg grating (FBG) is bonded to the structure of interest such that it encounters the arbitrary strain field. The arbitrary strain distribution is then determined inversely from the transmission intensity spectrum using a GA population-based optimization process. The major advantage of the proposed approach is its use of a single, uniform FBG to sense arbitrary strain distributions. The approach provides a low-cost and computationally efficient means of detecting strain distributions in many smart-structure monitoring applications.

©(2006) Society of Photo-Optical Instrumentation Engineers (SPIE)

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Hsu-Chih Cheng, Jen-Fa Huang, and Yu-Lung Lo "Numerical investigation on arbitrary strain distribution sensing with fiber Bragg grating-based Sagnac interferometer and genetic algorithm," Optical Engineering 45(12), 124401 (1 December 2006). https://doi.org/10.1117/1.2404603

Published: 1 December 2006

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KEYWORDS

Fiber Bragg gratings

Sagnac interferometers

Solids

Genetic algorithms

Optical engineering

Error analysis

Refractive index

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