Non-uniform strain measurement along a fiber Bragg grating using optical frequency domain reflectometry

• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2013,（10）
• 页码范围: 19-24
• 页数: 6页
• 语种: 英文
• DOI: 10.3788/COL201311.100603

摘要

A novel method of measuring non-uniform strain along a fiber Bragg grating (FBG) using optical frequency domain reflectometry (OFDR) is proposed and experimentally demonstrated.This method can overcome the problems of traditional non-uniform strain measurement methods for FBGs,i.e.,the likelihood of chirping and multiple peaking in the spectrum when FBG is subjected to inhomogeneous strain fields.Wavelength interrogation is realized by OFDR with a narrow-line-width tunable laser as the optical source.When non-uniform strain distributions along areas adjacent to structural damage are measured by this method,good agreement is obtained between measurements and theoretical simulation results.