Visualising scattering underwater acoustic fields using laser Doppler vibrometry

Harland, Andy R.; Petzing, Jon N.; Tyrer, John R.

doi:10.1016/j.jsv.2007.04.026

Cited by 6 publications

(3 citation statements)

References 33 publications

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“…To overcome this limitation, a Bragg cell is introduced to make an additional frequency shift of one of the beams. This results in a beat frequency offset in the registered signal and allows one to conclude the direction of movement by comparing the beat frequency to the one introduced by the Bragg cell [84].…”

Section: Doppler Vibrometry As a Defectoscopy Approachmentioning

confidence: 99%

A review of imaging methods in analysis of works of art: Thermographic imaging method in art analysis

2014

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This article discusses a number of modern techniques used for the analysis of works of art. The most widely used approaches as well as lesser known ones are outlined in terms of their applications and the kind of information on the condition of artworks that can be extracted. Special attention is paid to the method of thermographic analysis of works of pictorial art. The principles of the technique, various computational approaches, and safety concerns are discussed. A set of examples is provided for the demonstration of the capabilities of thermographic assessment, including a range of real canvas and panel paintings exhibited in museums and in private collections. PACS Nos.: 87.63.Hg, 78.20.nb, 81.70.Pg, 07.20.-n. Résumé : Nous discutons ici de techniques modernes utilisées pour analyser les oeuvres d'art. Nous présentons les méthodes les plus connues comme les moins connues, selon leurs applications et la sorte d'information qu'on peut extraire sur les conditions de l'oeuvre d'art. Nous portons une attention spéciale à l'analyse thermographique d'oeuvres picturales. Nous discutons les principes de la technique, des différentes approches informatiques et des soucis de sécurité. Nous présentons un ensemble d'exemples pour illustrer les capacités de l'évaluation thermographique, incluant plusieurs véritables tableaux et panneaux peints exposés dans des musées et des collections privées. [Traduit par la Rédaction]

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Section: Doppler Vibrometry As a Defectoscopy Approachmentioning

confidence: 99%

A review of imaging methods in analysis of works of art: Thermographic imaging method in art analysis

2014

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“…Vice versa, if one wants to measure acoustic fields the reflecting target is kept steady. In a typical set-up for underwater ultrasonic measurements using LDV a rigid reflector is placed at a certain distance from the transparent wall, behind the sound source (see figure 1) [10,12,13].…”

Section: Vibrations and Acoustic Field Measurement By Laser Doppler V...mentioning

confidence: 99%

Material properties identification using ultrasonic waves and laser Doppler vibrometer measurements: a multi-input multi-output approach

Longo

Vanlanduit

Guillaume

2013

Meas. Sci. Technol.

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In this paper a multi-input multi-output approach able to determine the material properties of homogeneous materials is presented. To do so, an experimental set-up which combines the use of multi harmonic signals with interleaved frequencies and laser Doppler vibrometer measurements has been developed. A modeling technique, based on transmission and reflection measurements, allowed the simultaneous determination of longitudinal wave velocity, density and thickness of the materials under test with high levels of precision and accuracy.

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“…and can be found in [ 6 ]. Conversely, schlieren and ESPI are inherently whole-field in their analytical approach; however, schlieren has usually been used as a qualitative technique, and ESPI has demonstrated a poor signal-to-noise ratio (SNR) [ 7 ]. An alternative technique that has more recently been demonstrated is that of laser Doppler vibrometry (LDV).…”

Section: Introductionmentioning

confidence: 99%

Underwater Acoustic Wavefront Visualization by Scanning Laser Doppler Vibrometer for the Characterization of Focused Ultrasonic Transducers

Longo

Vanlanduit

Arroud

et al. 2015

Sensors

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The analysis of acoustic wave fields is important for a large number of engineering designs, communication and health-related reasons. The visualization of wavefronts gives valuable information about the type of transducers and excitation signals more suitable for the test itself. This article is dedicated to the development of a fast procedure for acoustic fields visualization in underwater conditions, by means of laser Doppler vibrometer measurements. The ultrasonic probe is a focused transducer excited by a chirp signal. The scope of this work is to evaluate experimentally the properties of the sound beam in order to get reliable information about the transducer itself to be used in many kinds of engineering tests and transducer design.

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Visualising scattering underwater acoustic fields using laser Doppler vibrometry

Cited by 6 publications

References 33 publications

A review of imaging methods in analysis of works of art: Thermographic imaging method in art analysis

A review of imaging methods in analysis of works of art: Thermographic imaging method in art analysis

Material properties identification using ultrasonic waves and laser Doppler vibrometer measurements: a multi-input multi-output approach

Underwater Acoustic Wavefront Visualization by Scanning Laser Doppler Vibrometer for the Characterization of Focused Ultrasonic Transducers

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