Chinese Optics Letters, 2013, 11 (10): 100603, Published Online: Oct. 8, 2013
Non-uniform strain measurement along a fiber Bragg grating using optical frequency domain reflectometry Download: 760次
060.2370 Fiber optics sensors 060.2380 Fiber optics sources and detectors 070.2615 Frequency filtering
Abstract
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.
Fangdong Zhu, Dongsheng Zhang, Peng Fan, Litong Li, Yongxing Guo. Non-uniform strain measurement along a fiber Bragg grating using optical frequency domain reflectometry[J]. Chinese Optics Letters, 2013, 11(10): 100603.