A swept frequency multiplication technique for air-coupled ultrasonic NDE

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 tr...

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Bibliographic Details
Published in:IEEE transactions on ultrasonics, ferroelectrics, and frequency control ferroelectrics, and frequency control, 2004-10, Vol.51 (10), p.1271-1279
Main Authors: Gan TH, Hutchins, D.A., Green, R.J.
Format: Article
Language:English
Subjects:
Acoustics
Bandwidth
Chirp signals
Correlation
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Ferroelectric materials
Frequency conversion
Frequency domains
Fundamental areas of phenomenology (including applications)
General equipment and techniques
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Materials science
Materials testing
Multiplication
Nondestructive testing
Optical pulse compression
Physics
Piezoelectric transducers
Pulse compression
Pulse compression methods
Signal processing
Signal to noise ratio
Transducers
Ultrasonic imaging
Ultrasonic transducers
Ultrasonic variables measurement
Ultrasonics, quantum acoustics, and physical effects of sound
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Summary: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.
ISSN:0885-3010
1525-8955
DOI:10.1109/TUFFC.2004.1350955