Signal enhancement in Rayleigh wave interactions using a laser-ultrasound/EMAT imaging system

S. Boonsang; R. J. Dewhurst

doi:10.1016/j.ultras.2005.01.003

Signal enhancement in Rayleigh wave interactions using a laser-ultrasound/EMAT imaging system

S. Boonsang, R. J. Dewhurst

Research output: Contribution to journal › Article › peer-review

Abstract

Enhancement of signal amplitudes from Rayleigh wave interaction at solid surface features has been investigated when signals were detected by an in-plane electromagnetic acoustic transducer (EMAT). A laser-ultrasound system was used to inspect surface-breaking slots, serving as artificial defects. Nd:YAG laser pulses were delivered onto a metal surface via an optical fiber and focused to a line source by a cylindrical lens. An in-plane EMAT receiver detected transient surface acoustic waves. A-scan signals and B-scan images from surface defects revealed increased signal amplitude up to 2.8 ± 0.3 depending on the distance of the transducer from a slot. An explanation is based on the interaction of the EMAT sensor with the Rayleigh wave. A supporting computer model was derived to show that experimental signal enhancements were consistent with numerical predictions. © 2005 Elsevier B.V. All rights reserved.

Original language	English
Pages (from-to)	512-523
Number of pages	11
Journal	Ultrasonics
Volume	43
Issue number	7
DOIs	https://doi.org/10.1016/j.ultras.2005.01.003
Publication status	Published - Jun 2005

Keywords

EMATs
Imaging
Laser-ultrasound
Rayleigh wave interactions

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10.1016/j.ultras.2005.01.003

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title = "Signal enhancement in Rayleigh wave interactions using a laser-ultrasound/EMAT imaging system",

abstract = "Enhancement of signal amplitudes from Rayleigh wave interaction at solid surface features has been investigated when signals were detected by an in-plane electromagnetic acoustic transducer (EMAT). A laser-ultrasound system was used to inspect surface-breaking slots, serving as artificial defects. Nd:YAG laser pulses were delivered onto a metal surface via an optical fiber and focused to a line source by a cylindrical lens. An in-plane EMAT receiver detected transient surface acoustic waves. A-scan signals and B-scan images from surface defects revealed increased signal amplitude up to 2.8 ± 0.3 depending on the distance of the transducer from a slot. An explanation is based on the interaction of the EMAT sensor with the Rayleigh wave. A supporting computer model was derived to show that experimental signal enhancements were consistent with numerical predictions. {\textcopyright} 2005 Elsevier B.V. All rights reserved.",

keywords = "EMATs, Imaging, Laser-ultrasound, Rayleigh wave interactions",

author = "S. Boonsang and Dewhurst, {R. J.}",

year = "2005",

month = jun,

doi = "10.1016/j.ultras.2005.01.003",

language = "English",

volume = "43",

pages = "512--523",

journal = "Ultrasonics",

publisher = "Elsevier BV",

number = "7",

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TY - JOUR

T1 - Signal enhancement in Rayleigh wave interactions using a laser-ultrasound/EMAT imaging system

AU - Boonsang, S.

AU - Dewhurst, R. J.

PY - 2005/6

Y1 - 2005/6

N2 - Enhancement of signal amplitudes from Rayleigh wave interaction at solid surface features has been investigated when signals were detected by an in-plane electromagnetic acoustic transducer (EMAT). A laser-ultrasound system was used to inspect surface-breaking slots, serving as artificial defects. Nd:YAG laser pulses were delivered onto a metal surface via an optical fiber and focused to a line source by a cylindrical lens. An in-plane EMAT receiver detected transient surface acoustic waves. A-scan signals and B-scan images from surface defects revealed increased signal amplitude up to 2.8 ± 0.3 depending on the distance of the transducer from a slot. An explanation is based on the interaction of the EMAT sensor with the Rayleigh wave. A supporting computer model was derived to show that experimental signal enhancements were consistent with numerical predictions. © 2005 Elsevier B.V. All rights reserved.

AB - Enhancement of signal amplitudes from Rayleigh wave interaction at solid surface features has been investigated when signals were detected by an in-plane electromagnetic acoustic transducer (EMAT). A laser-ultrasound system was used to inspect surface-breaking slots, serving as artificial defects. Nd:YAG laser pulses were delivered onto a metal surface via an optical fiber and focused to a line source by a cylindrical lens. An in-plane EMAT receiver detected transient surface acoustic waves. A-scan signals and B-scan images from surface defects revealed increased signal amplitude up to 2.8 ± 0.3 depending on the distance of the transducer from a slot. An explanation is based on the interaction of the EMAT sensor with the Rayleigh wave. A supporting computer model was derived to show that experimental signal enhancements were consistent with numerical predictions. © 2005 Elsevier B.V. All rights reserved.

KW - EMATs

KW - Imaging

KW - Laser-ultrasound

KW - Rayleigh wave interactions

U2 - 10.1016/j.ultras.2005.01.003

DO - 10.1016/j.ultras.2005.01.003

M3 - Article

VL - 43

SP - 512

EP - 523

JO - Ultrasonics

JF - Ultrasonics

IS - 7

ER -

Signal enhancement in Rayleigh wave interactions using a laser-ultrasound/EMAT imaging system

Abstract

Keywords

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