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Inspection of drinks cans using non-contact electromagnetic acoustic transducers

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Ho, K. S., Billson, Duncan R. and Hutchins, David A. (2007) Inspection of drinks cans using non-contact electromagnetic acoustic transducers. Journal of Food Engineering, Vol.80 (No.2). pp. 431-444. doi:10.1016/j.jfoodeng.2006.04.025

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Official URL: http://dx.doi.org/10.1016/j.jfoodeng.2006.04.025

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Abstract

Electromagnetic acoustic transducers (EMATs) have been used to transmit ultrasonic signals across liquid-filled aluminium beverage containers. The work has demonstrated a non-contact method for both determining the location of liquid boundaries, and detecting the presence of foreign bodies using fan-beam tomographic imaging. Pulse compression signal processing, followed by acoustic mode extraction, has been used in a new technique, whereby unwanted guided waves that travelled around the container wall can be identified and removed from the image reconstruction process. Such waves would normally complicate the identification of the signals require for image formation that propagated through the liquid. The result is a method that has been used to provide images of simulated foreign bodies, by scanning EMATs around outer surface of aluminium drinks cans. The approach has also demonstrated the successful measurement of fill level. (c) 2006 Elsevier Ltd. All rights reserved.

Item Type: Journal Article
Subjects: T Technology > TP Chemical technology
T Technology > TX Home economics
Divisions: Faculty of Science, Engineering and Medicine > Engineering > Engineering
Journal or Publication Title: Journal of Food Engineering
Publisher: Elsevier Ltd.
ISSN: 0260-8774
Official Date: May 2007
Dates:
DateEvent
May 2007Published
Volume: Vol.80
Number: No.2
Number of Pages: 14
Page Range: pp. 431-444
DOI: 10.1016/j.jfoodeng.2006.04.025
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access

Data sourced from Thomson Reuters' Web of Knowledge

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