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

作者：Cheng Hsu Chih^*; Huang Jen Fa; Lo Yu Lung

来源：Optical Engineering, 2006, 45(12): 124401.

DOI：10.1117/1.2404603

• Sagnac interferometer
• fiber Bragg grating
• strain distribution
• genetic algorithm

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.

• 出版日期2006-12