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Texture measurements of metal sheets using wideband electromagnetic acoustic transducers

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UNSPECIFIED (2002) Texture measurements of metal sheets using wideband electromagnetic acoustic transducers. JOURNAL OF PHYSICS D-APPLIED PHYSICS, 35 (8). pp. 816-824. ISSN 0022-3727.

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Abstract

The group velocity of the zero-order symmetric Lamb wave mode (SO) has been measured on metal sheet as a function of angle to the rolling direction. Generation and detection of the Lamb wave was achieved using wideband non-contact ultrasonic electromagnetic acoustic transducers (EMATs). The EMATs were relatively small in size and employed permanent NdFeB magnets. The angular dependent velocity of the So mode was measured on both aluminium and stainless steel (3 16) sheet. The entire system was computer controlled and the data were processed as acquired. The generation EMAT was driven with a cur-rent pulse of 270 A (peak value). This high current level gave rise to a more powerful generation source than is usually obtained with EMATs, enabling measurements to be made on stainless steel sheet which is much less efficient for EMAT generation of So mode Lamb waves than aluminium sheet.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Journal or Publication Title: JOURNAL OF PHYSICS D-APPLIED PHYSICS
Publisher: IOP PUBLISHING LTD
ISSN: 0022-3727
Official Date: 21 April 2002
Dates:
DateEvent
21 April 2002UNSPECIFIED
Volume: 35
Number: 8
Number of Pages: 9
Page Range: pp. 816-824
Publication Status: Published

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