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Gan TH, Hutchins DA, Green RJ. A swept frequency multiplication technique for air-coupled ultrasonic NDE. IEEE Trans Ultrason Ferroelectr Freq Control. 2004;51(10):1271-9doi: 10.1109/tuffc.2004.1350955.
Gan, T. H., Hutchins, D. A., & Green, R. J. (2004). A swept frequency multiplication technique for air-coupled ultrasonic NDE. IEEE transactions on ultrasonics, ferroelectrics, and frequency control, 51(10), 1271-9. https://doi.org/10.1109/tuffc.2004.1350955
Gan, Tat Hean, et al. "A swept frequency multiplication technique for air-coupled ultrasonic NDE." IEEE transactions on ultrasonics, ferroelectrics, and frequency control vol. 51,10 (2004): 1271-9. doi: https://doi.org/10.1109/tuffc.2004.1350955
Gan TH, Hutchins DA, Green RJ. A swept frequency multiplication technique for air-coupled ultrasonic NDE. IEEE Trans Ultrason Ferroelectr Freq Control. 2004 Oct;51(10):1271-9. doi: 10.1109/tuffc.2004.1350955. PMID: 15553511.
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IEEE Trans Ultrason Ferroelectr Freq Control. 2004 Oct;51(10):1271-9. doi: 10.1109/tuffc.2004.1350955.

A swept frequency multiplication technique for air-coupled ultrasonic NDE.

IEEE transactions on ultrasonics, ferroelectrics, and frequency control

Tat Hean Gan, David A Hutchins, Roger J Green

Affiliations

  1. School of Engineering, University of Warwick, Coventry CV4 7AL, UK. [email protected]

PMID: 15553511 DOI: 10.1109/tuffc.2004.1350955

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.

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