Numerical and experimental studies of the generation of ultrasound by laser

Dubois, Marc; Enguehard, Franck; Bertrand, Lionel; Choquet, Marc; Monchalin, Jean‐Pierre

doi:10.1051/jp4:19947161

Cited by 6 publications

(7 citation statements)

References 5 publications

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“…These waves are intense due to the important penetration of the Y AG radiation in the PVC [16]. Moreover, the acoustic impedance of the glass being large as compared to the one of the PVC, the wave propagating in the -z direction towards the glass is primarily reflected at the interface and its polarization is inversed, so that the reflected wave propagating in the +z direction towards the free surface of the PVC has its polarization in phase with the one of the wave created in the PVC by the thermoelastic effect and propagating in the +z direction.…”

Section: Improvement Of the Sample -Validation Ofthe Two-layer Modelmentioning

confidence: 99%

A Two-Layer Model for the Laser Generation of Ultrasound in Graphite-Epoxy Laminates

Dubois

Enguehard

Bertrand

1995

Review of Progress in Quantitative Nondestructive Evaluation

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Section: Improvement Of the Sample -Validation Ofthe Two-layer Modelmentioning

confidence: 99%

A Two-Layer Model for the Laser Generation of Ultrasound in Graphite-Epoxy Laminates

Dubois

Enguehard

Bertrand

1995

Review of Progress in Quantitative Nondestructive Evaluation

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“…Further to this unidimentional model, 3-D cases have been treated assuming axisymetry [16] and an othotropic medium [17]. Light penetration has been experimentally studied in detail with colored glasses giving a wide range of penetration depths [15,18]. Light penetration is very important in practice since its gives a piston source at the surface of the material emitting normally propagating longitudinal waves, independently of the surface curvature and of the orientation of the laser beam.…”

Section: Lasermentioning

confidence: 99%

Laser-Ultrasonics: From the Laboratory to Industry

Monchalin¹

2004

AIP Conference Proceedings

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A broad overview of the field of laser-ultrasonics is presented. This overview draws from developments at the Industrial Materials Institute of the National Research Council of Canada as well as elsewhere. The principles of generation and detection are presented, stressing a few key characteristics of laser-ultrasonics: the material is actually the emitting transducer and transduction is made by light, thus eliminating any contact. These features carry both advantages and limitations that are explained. Another feature, which has been an impediment, is actually the complexity of the "laser-ultrasonic transducer", but in spite of this complexity, it can be made very reliable for use in severe industrial environments. It also can be very cost effective for a number of applications. Three applications that are now used in industry are presented: the inspection of polymer matrix composites used in aerospace, the measurement of thin layers in microelectronics and the thickness gauging of hot steel tubing in production. Technological aspects, such as interferometer design, detection lasers and others are also discussed. As an overall conclusion, laser-ultrasonics that was for a long time a laboratory curiosity has definitely now made its transition to industry. Nevertheless, developments should continue to improve performance, to make it well adapted to specific inspection or characterization tasks and more affordable.

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“…1,3 It gives rise to pulse shaped longitudinal acoustic arrivals on the rear side of the sample ͑the first of these pulses being termed the precursor͒, and it transforms a rather unfavorable longitudinal wave emissivity pattern into a highly directional one in the direction normal to the impinged surface. 4 For the purpose of illustration, Fig. 1 displays the longitudinal wave emissivity patterns produced by the pointlike excitation of an extremely absorbing material and of a weakly absorbing one presenting the same other physical properties.…”

Section: Introductionmentioning

confidence: 99%

Effects of optical penetration and laser pulse duration on laser generated longitudinal acoustic waves

Enguehard

Bertrand

1997

Journal of Applied Physics

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In this article, we concentrate on the optical penetration and laser pulse duration effects on the features of the ultrasonic waves generated in a solid by a laser impact. We consider the simple case of a uniform irradiation of the sample, which we describe with the help of a simple analytical one-dimensional model. In spite of its simplicity, this model clearly highlights the competition that occurs between two temporal convolution sources, related to the optical penetration and the laser pulse duration, respectively, to produce the longitudinal arrivals on the rear side of the sample. The model is also used for an accurate description of the features of the longitudinal precursor.

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Numerical and experimental studies of the generation of ultrasound by laser

Cited by 6 publications

References 5 publications

A Two-Layer Model for the Laser Generation of Ultrasound in Graphite-Epoxy Laminates

A Two-Layer Model for the Laser Generation of Ultrasound in Graphite-Epoxy Laminates

Laser-Ultrasonics: From the Laboratory to Industry

Effects of optical penetration and laser pulse duration on laser generated longitudinal acoustic waves

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