Visualization of phase conjugate ultrasound waves passed through inhomogeneous layer

Yamamoto, Ken; Pernod, Philippe; Preobrazhensky, V.

doi:10.1016/j.ultras.2003.12.041

Cited by 7 publications

(4 citation statements)

References 8 publications

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“…Optical visualization of ultrasonic waves is helpful for understanding wave propagation in transparent materials. Stroboscopic ultrasonic visualizations, such as the Schlieren technique 1,2 , Fresnel method 3 , and photoelastic method [4][5][6] , have been used to find solutions to the problems encountered in ultrasonic non-destructive testing and the evaluation of probe design and performance. Video visualizations of vibrating materials and traveling ultrasonic pulses are also useful educational tools for studying wave behavior and properties.…”

Section: Introductionmentioning

confidence: 99%

Sensitive tint visualization of resonance patterns in glass plate

Yamamoto¹,

Izuno²,

Aoyanagi³

2012

AIP Conference Proceedings

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Section: Introductionmentioning

confidence: 99%

Sensitive tint visualization of resonance patterns in glass plate

Yamamoto¹,

Izuno²,

Aoyanagi³

2012

AIP Conference Proceedings

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“…In such case nonlinear harmonic imaging can be successfully applied for the diagnostics. Ultrasonic wave phase conjugation (WPC) [ 2] is of special interest for harmonic acoustic imaging [3,4] owing to possibilities of selection, conjugation and amplification of harmonic components of nonlinear probing waves [ 5,6,7] automatic con-focality of phase conjugate harmonics and compensation of phase distortions in linear and nonlinear modes of wave propagation [8,9,10].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Acoustic Imaging of Isoechogenic Objects and Flows Using Ultrasound Wave Phase Conjugation

Preobrazhensky¹,

Pernod²,

Pyl'Nov³

et al. 2009

Acta Acustica united with Acustica

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The results of theoretical and experimental studies of application of parametric wave phase conjugation (WPC) forn onlinear detection of isoechogenic phantoms and for ultrasonic velocimetry of flows are reported. Experimental WPC harmonic imaging of isoechogenic phantoms in water wasd emonstrated on an example of cells filled with am ixture of water and methyl alcohol. Va riation of methanol concentration allows obtaining some mixtures with varied nonlinear parameters while their linear acoustic impedance remains close to the water's one. Analysis of harmonics of phase conjugate waves(PCW)i nautomatically con-focal WPC-system provides reliable detection of the phantoms. According to the theoretical predictions the contrasts of images are comparable with, or even stronger,t han the ratio of nonlinear parameters of ap hantom and its surrounding medium. 3D-simulation of propagation of PCW in heterogeneously nonlinear and moving media is developed. Break of time reversal invariance of WPC in moving media is proposed as ap rinciple of detection and velocimetry of flows. The results of experimental linear and harmonic imaging of flows in water are presented in comparison with theoretical description.

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“…Numerical simulation 17,18 performed with this model gave qualitative results in agreement with experiments. 19 In acoustics, in contrast to optics, the saturation process leading to the saturation, does not come from the constitutive law of the medium since the relative variation of the sound velocity with the intensity of the wave is negligible compared with what happens to the refraction index and losses in optics. The nonlinear processes leading to saturation have been shown to be the feedback of elastic energy to electric energy.…”

Section: Introductionmentioning

confidence: 99%

Resonant solutions in wave phase conjugation induced by a limited magnetoacoustic conjugator

Merlen¹,

Zhang²

2006

The Journal of the Acoustical Society of America

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This paper presents, in one dimension, the general analytical solution of the acoustic phase conjugation in an active medium in contact with passive media of arbitrary impedance. The homogeneous case where no impedance jumps exist at the edge of the active zone is obtained as a particular case. This homogeneous case was the only one treated explicitly in the literature but mostly in the frame of Brillouin scattering. In contrast to this previous work, the present theory is based on a preliminary straightforward analysis using a dual-time-scale method and provides very practical results like the threshold of the supercritical modes, the rate of amplification, and its link with the stress repartition in the conjugator.

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Visualization of phase conjugate ultrasound waves passed through inhomogeneous layer

Cited by 7 publications

References 8 publications

Sensitive tint visualization of resonance patterns in glass plate

Sensitive tint visualization of resonance patterns in glass plate

Nonlinear Acoustic Imaging of Isoechogenic Objects and Flows Using Ultrasound Wave Phase Conjugation

Resonant solutions in wave phase conjugation induced by a limited magnetoacoustic conjugator

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