Observing ultrasonic wave propagation by stroboscopic visualization methods

Hall, Kevin G

doi:10.1016/0041-624x(82)90034-8

Cited by 25 publications

(9 citation statements)

References 3 publications

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“…Results were particularly interesting for the development of non-destructive testing applications. In the 1980s, the observation quality was improved thanks to camera technology improvement [34], and more recently progress has been made toward quantification of stresses resulting from ultrasonic wave propagation [35]. Shadowgraphy or stroboscopy are commonly used in fluid mechanics science [36].…”

Section: Experimental and Numerical Investigations Of Shock And Shearmentioning

confidence: 99%

Experimental and numerical investigations of shock and shear wave propagation induced by femtosecond laser irradiation in epoxy resins

Ecault¹,

Berthe²,

Touchard³

et al. 2015

J. Phys. D: Appl. Phys.

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et al.. Experimental and numerical investigations of shock and shear wave propagation induced by femtosecond laser irradiation in epoxy resins. Science Arts & Métiers (SAM)is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. This is an author-deposited version published in: http://sam.ensam.eu Handle IDExperimental and numerical investigations of shock and shear wave propagation induced by femtosecond laser irradiation in epoxy resins - AbstractIn this work, original shock experiments are presented. Laser-induced shock and shear wave propagations have been observed in an epoxy resin, in the case of femtosecond laser irradiation. A specific time-resolved shadowgraphy setup has been developed using the photoelasticimetry principle to enhance the shear wave observation. Shear waves have been observed in epoxy resin after laser irradiation. Their propagation has been quantified in comparison with the main shock propagation. A discussion, hinging on numerical results, is finally given to improve understanding of the phenomenon.

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Section: Experimental and Numerical Investigations Of Shock And Shearmentioning

confidence: 99%

Experimental and numerical investigations of shock and shear wave propagation induced by femtosecond laser irradiation in epoxy resins

Ecault¹,

Berthe²,

Touchard³

et al. 2015

J. Phys. D: Appl. Phys.

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“…While the schlieren method can be more sensitive to acoustic waves in liquids, the photoelastic method can observe the shear stress mode and is the method applied in this study. The earliest publication of the photoelastic method 28 occurred decades prior to the first applications to ultrasonic visualization [29][30][31][32] . More current efforts around image digitization and quantification [33][34][35][36][37] are in part a result of improved camera and LED light source technology.…”

Section: Photoelastic Visualization Methodologymentioning

confidence: 99%

Ultrasonic thickness structural health monitoring photoelastic visualization and measurement accuracy for internal pipe corrosion

Eason

Bond

Lozev³

2015

SPIE Proceedings

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Oil refinery production of fuels is becoming more challenging as a result of the changing world supply of crude oil towards properties of higher density, higher sulfur concentration, and higher acidity. One such production challenge is an increased risk of naphthenic acid corrosion that can result in various surface degradation profiles of uniform corrosion, non-uniform corrosion, and localized pitting in piping systems at temperatures between 150°C and 400°C. The irregular internal surface topology and high external surface temperature leads to a challenging in-service monitoring application for accurate pipe wall thickness measurements. Improved measurement technology is needed to continuously profile the local minimum thickness points of a non-uniformly corroding surface. The measurement accuracy and precision must be sufficient to provide a better understanding of the integrity risk associated with refining crude oils of higher acid concentration. This paper discusses potential technologies for measuring localized internal corrosion in high temperature steel piping and describes the approach under investigation to apply flexible ultrasonic thinfilm piezoelectric transducer arrays fabricated by the sol-gel manufacturing process. Next, the elastic wave beam profile of a sol-gel transducer is characterized via photoelastic visualization. Finally, the variables that impact measurement accuracy and precision are discussed and a maximum likelihood statistical method is presented and demonstrated to quantify the measurement accuracy and precision of various time-of-flight thickness calculation methods in an ideal environment. The statistical method results in confidence values analogous to the a90 and a90/95terminology used in Probability-of-Detection (POD) assessments. RightsCopyright 2015 Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited. ABSTRACTOil refinery production of fuels is becoming more challenging as a result of the changing world supply of crude oil towards properties of higher density, higher sulfur concentration, and higher acidity. One such production challenge is an increased risk of naphthenic acid corrosion that can result in various surface degradation profiles of uniform corrosion, non-uniform corrosion, and localized pitting in piping systems at temperatures between 150°C and 400°C. The irregular internal surface topology and high external surface temperature leads to a challenging in-service monitoring application for accurate pipe wall thickness measurements. Improved measurement technology is needed to continuously profile the local minimum thickness points of a non-uniformly corroding surface. The measurement accuracy and precision must be sufficient to provide a better understanding of the integrity risk associated with refining crude o...

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“…Therefore, it is interesting to have techniques that provide direct knowledge of the radiated field when the transducer is coupled to a solid propagation medium. Methods based on e.g., Schlieren imaging [19,20] or photoelasticity [21][22][23] have long been available for visualization of ultrasonic waves within solid materials, and some quantitative results have also been published, [24,25] but their application is restricted to optically transparent media only. Thus, the standardized approach for measurements of beam profiles in solids is the acquisition of pulse-echo signals that arise from the interaction of the sound beam with targets placed in the material, such as metal balls or wires embedded in plastics, or flat-bottom or side holes drilled in metallic blocks.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Transducer Performance and Narrowband Transient Ultrasonic Fields in Metals by Rayleigh-Sommerfeld Backpropagation of Compression Acoustic Waves Measured with Double-Pulsed Tv Holography

Trillo¹,

Doval²,

Fernández³

et al. 2014

International Journal of Optomechatronics

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This article presents a method aimed at the characterization of the narrowband transient acoustic field radiated by an ultrasonic plane transducer into a homogeneous, isotropic and optically opaque prismatic solid, and the assessment of the performance of the acoustic source. The method relies on a previous technique based on the full-field optical measurement of an acoustic wavepacket at the surface of a solid and its subsequent numerical backpropagation within the material. The experimental results show that quantitative transversal and axial profiles of the complex amplitude of the beam can be obtained at any plane between the measurement and excitation surfaces. The reconstruction of the acoustic field at the transducer face, carried out on a defective transducer model, shows that the method could also be suitable for the nondestructive testing of the performance of ultrasonic sources. In all cases, the measurements were performed with the transducer working under realistic loading conditions.

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Observing ultrasonic wave propagation by stroboscopic visualization methods

Cited by 25 publications

References 3 publications

Experimental and numerical investigations of shock and shear wave propagation induced by femtosecond laser irradiation in epoxy resins

Experimental and numerical investigations of shock and shear wave propagation induced by femtosecond laser irradiation in epoxy resins

Ultrasonic thickness structural health monitoring photoelastic visualization and measurement accuracy for internal pipe corrosion

Characterization of Transducer Performance and Narrowband Transient Ultrasonic Fields in Metals by Rayleigh-Sommerfeld Backpropagation of Compression Acoustic Waves Measured with Double-Pulsed Tv Holography

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