NDLI: Ultrasonic Lamb Wave Inspection Using Fiber Bragg Gratings

Content Provider	IEEE Xplore Digital Library
Author	Zhang Haiyan Sun Xiuli Qi Xuerui Liu Xiao Lu DongHui
Copyright Year	2008
Description	Author affiliation: Sch. of Electron., Shanghai Jiaotong Univ., Shanghai (Liu Xiao) \|\| Sch. of Commun. & Inf. Eng., Shanghai Univ., Shanghai (Zhang Haiyan; Sun Xiuli; Qi Xuerui; Lu DongHui)
Abstract	A new ultrasonic Lamb wave nondestructive testing (NDT) system is developed in this paper. The basic idea is to use fiber Bragg gratings (FBG) sensors as acoustic receivers of ultrasonic Lamb waves. The spectral response of fiber Bragg gratings (FBGs) subjected to the ultrasonic field has been theoretically and numerically investigated. Taking into account the geometrical and elasto-optic effects, the Bragg effective refractive index modulation under the ultrasonic wave action is deduced. A transfer matrix method is used to analyze the influence of ultrasound on the reflection spectrum of FBGs. Numerical results show that the influence of ultrasonic field on grating spectrum is highly correlated to the ratio between the ultrasonic wavelength and the grating length. Only when the ratio is quite larger, the peak wavelength of reflection spectrum shifts while the shape of the grating remains unchanged. The reason is explained by the strain variation along the grating. The results of this analysis provide useful tools for the determination of gage length of FBG sensor and the choice of Lamb wave frequency when the new NDT system is used for damage detection.
Starting Page	805
Ending Page	808
File Size	2061711
Page Count	4
File Format	PDF
ISBN	9781424438211
DOI	10.1109/CJMW.2008.4772550
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-09-10
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Shanghai Univ.
Subject Keyword	Shape Nondestructive testing Refractive index reflection spectrum Inspection Reflection FBG Bragg gratings Lamb wave Ultrasonic imaging transfer matrix Acoustic sensors Fiber gratings Acoustic waves NDT
Content Type	Text
Resource Type	Article

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