Measurement of Arbitrary Strain Profiles by Fiber Bragg Gratings in Fabry-Perot-like Spectrums with Real-coded Genetic Algorithm

• Main Authors: Yong-Jing Xiao, 蕭永靖
• Other Authors: Jen-Fa Huang
• Format: Others
• Language: en_US
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/06424658434997616857

碩士 === 國立成功大學 === 光電科學與工程研究所 === 92 === 　　In this thesis we will propose that the methods of arbitrary strain distribution sensing with real-code genetic algorithm to analyze the reflection spectrums of Fabry-Perot-like of fiber Bragg gratings. The arbitrary strain distribution along the fiber Bragg gratings is recovered inversely from the Fabry-Perot-like reflective spectrum using the genetic algorithm optimization process. 　　The proposed methods permit accurate strain reconstruction with no restrictions on the applied strain profile or on the grating length. We demonstrate the validity and accuracy of these techniques by reconstructing the strain distribution along the grating with nonmonotonic strain profile, which includes: a constant strain distribution, linearly gradient strain, and strain discontinuities.