NDLI: Frequency-sweep examination for wave mode identification in multimodal ultrasonic guided wave signal

Content Provider	IEEE Xplore Digital Library
Author	Fateri, S. Boulgouris, N.V. Wilkinson, A. Balachandran, W. Tat-Hean Gan
Copyright Year	1986
Abstract	Ultrasonic guided waves can be used to assess and monitor long elements of a structure from a single position. The greatest challenges for any guided wave system are the plethora of wave modes arising from the geometry of the structural element which propagate with a range of frequency-dependent velocities and the interpretation of these combined signals reflected by discontinuities in the structural element. In this paper, a novel signal processing technique is presented using a combination of frequency-sweep measurement, sampling rate conversion, and Fourier transform. The technique is applied to synthesized and experimental data to identify different modes in complex ultrasonic guided wave signals. It is demonstrated throughout the paper that the technique also has the capability to derive the time of flight and group velocity dispersion curve of different wave modes in field inspections.
Starting Page	1515
Ending Page	1524
Page Count	10
File Size	4238715
File Format	PDF
ISSN	08853010
Volume Number	61
Issue Number	9
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Dispersion Frequency conversion Time-frequency analysis Acoustics Fourier transforms Inspection Frequency control
Content Type	Text
Resource Type	Article
Subject	Acoustics and Ultrasonics Instrumentation Electrical and Electronic Engineering

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