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A Swept Frequency Multiplication Technique for Air-Coupled Ultrasonic NDE.

Authors :
Gan, Tat Hean
Hutchins, David A.
Green, Roger J.
Source :
IEEE Transactions on Ultrasonics Ferroelectrics & Frequency Control. Oct2004, Vol. 51 Issue 10, p1271-1279. 9p. 3 Black and White Photographs, 1 Diagram, 24 Graphs.
Publication Year :
2004

Abstract

A new technique has been investigated for improving the signals that can be obtained in air-coupled nondestruction evaluation (NDE). This relies on the wide bandwidth available from polymer-filmed capacitive transducers. The technique relies on a swept-frequency "chirp" signal, which is transmitted from a transducer in air. The new technique differs from existing time-domain correlation techniques, such as pulse compression, in that a single multiplication process is performed in the time domain to give a difference frequency signal. This then can be isolated easily in the frequency domain. It will be demonstrated that this new swept frequency multiplication (SFM) approach gives the potential for rapid air-coupled imaging. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
08853010
Volume :
51
Issue :
10
Database :
Academic Search Index
Journal :
IEEE Transactions on Ultrasonics Ferroelectrics & Frequency Control
Publication Type :
Academic Journal
Accession number :
15032309
Full Text :
https://doi.org/10.1109/TUFFC.2004.1350955