NDLI: Wavelet transform signal processing for dispersion analysis of ultrasonic signals

Content Provider	IEEE Xplore Digital Library
Author	Abbate, A. Frankel, J. Das, P.
Copyright Year	1995
Description	Author affiliation: Benet Lab., US Army Res. Dev. & Eng. Center, Watervliet, NY, USA (Abbate, A.; Frankel, J.)
Abstract	The wavelet transform provides a new tool for analyzing the time-frequency evolution of transient signals as an alternative to the classical short-time Fourier transform. The purpose of the present paper is to provide an overview of the applicability of the wavelet transform technique to the analysis of the propagation of dispersive ultrasonic waves. The wavelet transform is briefly introduced, with special emphasis on the relationship between the wavelet transform and the group velocity of dispersed signals. A complex mother wavelet is utilized to obtain the time evolution of the various spectral components of the ultrasonic signal, and the magnitude of the wavelet transform is used to represent the envelope of the ultrasonic pulse and to determine the time of arrival of the acoustic energy. This approach results in a time-scale representation of the ultrasonic signal which is extremely useful in the characterization of thin coatings using the dispersion behavior of the surface wave velocity. The technique was applied for the measurement of elastic constants of chromium coatings on steel substrates using laser-generated surface acoustic waves. Numerical simulations and experimental results are presented to discuss the usefulness of the wavelet transform.
Starting Page	751
Ending Page	755
File Size	322624
Page Count	5
File Format	PDF
ISBN	0780329406
ISSN	10510117
DOI	10.1109/ULTSYM.1995.495677
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-11-07
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Wavelet analysis Wavelet transforms Signal processing Signal analysis Fourier transforms Dispersion Acoustic pulses Acoustic waves Coatings Surface acoustic waves
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
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