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Non-contact ultrasonic characterization of defects using EMATs
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UNSPECIFIED (2005) Non-contact ultrasonic characterization of defects using EMATs. In: 31st Annual Review of Progress in Quantitative Nondestructive Evaluation, Colorado Sch Mines, Golden, CO, JUL 25-30, 2004. Published in: Review of Progress in Quantitative Nondestructive Evaluation, Vols 24A and 24B, 760 pp. 1568-1575. ISBN 0-7354-0245-0. ISSN 0094-243X.
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Abstract
We have developed a non-contact ultrasonic technique for detecting and gauging the depth Of Surface and subsurface defects in metals. A low-frequency broadband Rayleigh-wave pulse is generated and detected by two electro-magnetic acoustic transducers (EMATs) held at a standoff of LIP to 5 mm, with laser generation and detection also possible. This technique has applications for online testing such as rail track inspection, where faster speeds than will conventional contact ultrasonic techniques should be possible. We describe experiments gauging the position and depth of cracks by measuring the change in signal amplitude and frequency Content with the EMATs oil either side of the defect.. or by looking for all enhancement of the signal close to tire defect.
Item Type: | Conference Item (UNSPECIFIED) | ||||
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Subjects: | Q Science > QC Physics | ||||
Series Name: | AIP CONFERENCE PROCEEDINGS | ||||
Journal or Publication Title: | Review of Progress in Quantitative Nondestructive Evaluation, Vols 24A and 24B | ||||
Publisher: | AMER INST PHYSICS | ||||
ISBN: | 0-7354-0245-0 | ||||
ISSN: | 0094-243X | ||||
Editor: | Thompson, DO and Chimenti, DE | ||||
Official Date: | 2005 | ||||
Dates: |
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Volume: | 760 | ||||
Number of Pages: | 8 | ||||
Page Range: | pp. 1568-1575 | ||||
Publication Status: | Published | ||||
Title of Event: | 31st Annual Review of Progress in Quantitative Nondestructive Evaluation | ||||
Location of Event: | Colorado Sch Mines, Golden, CO | ||||
Date(s) of Event: | JUL 25-30, 2004 |
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