A model for the ultrasonic detection of surface-breaking cracks by the Scanning Laser-Source technique

Irene Arias; Jan D. Achenbach

doi:10.1117/12.540109

A model for the ultrasonic detection of surface-breaking cracks by the Scanning Laser-Source technique

Irene Arias^*, Jan D. Achenbach

^*Corresponding author for this work

Research output: Contribution to journal › Conference article › peer-review

5 Scopus citations

Abstract

A model for the Scanning Laser Source (SLS) technique is presented. The SLS is a novel laser based inspection method for the ultrasonic detection of small surface-breaking cracks. The generated ultrasonic signal is monitored as a line-focused laser is scanned over the defect. Characteristic changes in the amplitude and the frequency content are observed. The modelling approach is based on the decomposition of the field generated by the laser in a cracked two-dimensional half-space, by virtue of linear superposition, into the incident and the scattered fields. The incident field is that generated by laser illumination of a defect-free half-space. A thermoelastic model has been used which takes account of the effect of thermal diffusion, as well as the finite width and duration of the laser source. The scattered field incorporates the interactions of the incident field with the surface-breaking crack. It has been analyzed numerically by a direct frequency domain boundary element method. A comparison with an experiment for a large defect shows that the model captures the observed phenomena.

Original language	English (US)
Pages (from-to)	123-131
Number of pages	9
Journal	Proceedings of SPIE - The International Society for Optical Engineering
Volume	5393
DOIs	https://doi.org/10.1117/12.540109
State	Published - 2004
Externally published	Yes
Event	Nondestructive Evaluation and Health Monitoring of Aerospace Materials and Composites III - San Diego, CA, United States Duration: Mar 16 2004 → Mar 17 2004

Funding

This paper is based upon work partially supported by the Federal Aviation Administration under Contract #DFTA03-98-F-IA029, and partially supported by the Office of Naval Research under Contract N00014-89-J-1362. The discussions and experimental results provided by Younghoon Sohn and Prof. Krishnaswamy are gratefully acknowledged, as well as the computing resources generously provided by Profs. Wing Kam Liu and Ted Belytschko.

Keywords

Laser ultrasonics
Line-source
Modelling
Scanning Laser Source technique
Surface-breaking crack
Thermoelastic regime

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Computer Science Applications
Applied Mathematics
Electrical and Electronic Engineering

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10.1117/12.540109

Cite this

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title = "A model for the ultrasonic detection of surface-breaking cracks by the Scanning Laser-Source technique",

abstract = "A model for the Scanning Laser Source (SLS) technique is presented. The SLS is a novel laser based inspection method for the ultrasonic detection of small surface-breaking cracks. The generated ultrasonic signal is monitored as a line-focused laser is scanned over the defect. Characteristic changes in the amplitude and the frequency content are observed. The modelling approach is based on the decomposition of the field generated by the laser in a cracked two-dimensional half-space, by virtue of linear superposition, into the incident and the scattered fields. The incident field is that generated by laser illumination of a defect-free half-space. A thermoelastic model has been used which takes account of the effect of thermal diffusion, as well as the finite width and duration of the laser source. The scattered field incorporates the interactions of the incident field with the surface-breaking crack. It has been analyzed numerically by a direct frequency domain boundary element method. A comparison with an experiment for a large defect shows that the model captures the observed phenomena.",

keywords = "Laser ultrasonics, Line-source, Modelling, Scanning Laser Source technique, Surface-breaking crack, Thermoelastic regime",

author = "Irene Arias and Achenbach, {Jan D.}",

note = "Funding Information: This paper is based upon work partially supported by the Federal Aviation Administration under Contract #DFTA03-98-F-IA029, and partially supported by the Office of Naval Research under Contract N00014-89-J-1362. The discussions and experimental results provided by Younghoon Sohn and Prof. Krishnaswamy are gratefully acknowledged, as well as the computing resources generously provided by Profs. Wing Kam Liu and Ted Belytschko.; Nondestructive Evaluation and Health Monitoring of Aerospace Materials and Composites III ; Conference date: 16-03-2004 Through 17-03-2004",

year = "2004",

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language = "English (US)",

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pages = "123--131",

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AU - Arias, Irene

AU - Achenbach, Jan D.

N1 - Funding Information: This paper is based upon work partially supported by the Federal Aviation Administration under Contract #DFTA03-98-F-IA029, and partially supported by the Office of Naval Research under Contract N00014-89-J-1362. The discussions and experimental results provided by Younghoon Sohn and Prof. Krishnaswamy are gratefully acknowledged, as well as the computing resources generously provided by Profs. Wing Kam Liu and Ted Belytschko.

PY - 2004

Y1 - 2004

N2 - A model for the Scanning Laser Source (SLS) technique is presented. The SLS is a novel laser based inspection method for the ultrasonic detection of small surface-breaking cracks. The generated ultrasonic signal is monitored as a line-focused laser is scanned over the defect. Characteristic changes in the amplitude and the frequency content are observed. The modelling approach is based on the decomposition of the field generated by the laser in a cracked two-dimensional half-space, by virtue of linear superposition, into the incident and the scattered fields. The incident field is that generated by laser illumination of a defect-free half-space. A thermoelastic model has been used which takes account of the effect of thermal diffusion, as well as the finite width and duration of the laser source. The scattered field incorporates the interactions of the incident field with the surface-breaking crack. It has been analyzed numerically by a direct frequency domain boundary element method. A comparison with an experiment for a large defect shows that the model captures the observed phenomena.

AB - A model for the Scanning Laser Source (SLS) technique is presented. The SLS is a novel laser based inspection method for the ultrasonic detection of small surface-breaking cracks. The generated ultrasonic signal is monitored as a line-focused laser is scanned over the defect. Characteristic changes in the amplitude and the frequency content are observed. The modelling approach is based on the decomposition of the field generated by the laser in a cracked two-dimensional half-space, by virtue of linear superposition, into the incident and the scattered fields. The incident field is that generated by laser illumination of a defect-free half-space. A thermoelastic model has been used which takes account of the effect of thermal diffusion, as well as the finite width and duration of the laser source. The scattered field incorporates the interactions of the incident field with the surface-breaking crack. It has been analyzed numerically by a direct frequency domain boundary element method. A comparison with an experiment for a large defect shows that the model captures the observed phenomena.

KW - Laser ultrasonics

KW - Line-source

KW - Modelling

KW - Scanning Laser Source technique

KW - Surface-breaking crack

KW - Thermoelastic regime

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A model for the ultrasonic detection of surface-breaking cracks by the Scanning Laser-Source technique

Abstract

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Keywords

ASJC Scopus subject areas

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