Hutchins, David A., Burrascano, Pietro, Davis, Lee A. J., Laureti, Stefano and Ricci, Marco (2014) Coded waveforms for optimised air-coupled ultrasonic nondestructive evaluation. Ultrasonics, 54 (7). pp. 1745-1759. doi:10.1016/j.ultras.2014.03.007

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Abstract

This paper investigates various types of coded waveforms that could be used for air-coupled ultrasound, using a pulse compression approach to signal processing. These are needed because of the low signal-to-noise ratios that are found in many air-coupled ultrasonic nondestructive evaluation measurements, due to the large acoustic mismatch between air and many solid materials. The various waveforms, including both swept-frequency signals and those with binary modulation, are described, and their performance in the presence of noise is compared. It is shown that the optimum choice of modulation signal depends on the bandwidth available and the type of measurement being made.

Item Type:	Journal Article
Divisions:	Faculty of Science, Engineering and Medicine > Engineering > Engineering
Journal or Publication Title:	Ultrasonics
Publisher:	Elsevier Science BV
ISSN:	0041-624X
Official Date:	September 2014
Dates:	Date Event September 2014 Published 24 March 2014 Available 13 March 2014 Accepted
Volume:	54
Number:	7
Page Range:	pp. 1745-1759
DOI:	10.1016/j.ultras.2014.03.007
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access

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