Focusing of a nonlinear phase-conjugate ultrasonic wave transmitted through a phase-inhomogeneous layer

Brysev, A. P.; Bunkin, F. V.; Klopotov, R. V.; Krutyanskii, L. M.; Preobrazhenskii, V.V.

doi:10.1134/1.1381633

Cited by 6 publications

(3 citation statements)

References 10 publications

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“…The C-scan image correctly describes the distribution of the nonlinear parameter.Oncontrary,the B-scan enlarges the shape due to the length of the focal zone comparable to the size of the inclusion. Calculation of the signal at frequency4ωwasmade by substitution of the solutions (7), ( 8),and (9) to the equations (3) and (5) and by integration overtransversal coordinates. The source term in the equation (3),according to the solution (7) and expression (4),i sG aussian function of transversal coordinates.…”

Section: Detection Of Isoechogenic Inclusions Bymentioning

confidence: 99%

“…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%

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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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Section: Detection Of Isoechogenic Inclusions Bymentioning

confidence: 99%

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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show abstract

“…The closest investigations a͒ Author to whom correspondence should be addressed. Electronic mail: krut@orc.ru in this regard, by Brysev et al, 9,10 report measurements of harmonic components generated in a conjugate beam propagating through an inhomogeneous layer. The emphasis was on compensation of phase aberration due to the inhomogeneity, rather than on variation of parameters influencing diffraction, and there were no comparisons with theory.…”

Section: Introductionmentioning

confidence: 97%

Focused nonlinear phase-conjugate waves generated by a solid parametric amplifier

Brysev

Bunkin

Krutyansky

et al. 2005

The Journal of the Acoustical Society of America

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An experimental and numerical study is reported on focused, phase-conjugated sound beams of finite amplitude produced in water by a solid-state parametric amplifier, referred to as the conjugator. The sound beams incident on the conjugator were radiated by a focused circular source. Field distributions were measured along the beam axis and in the focal plane of the source. Both linear and nonlinear propagation were investigated. Apertures of different diameters were placed in front of the conjugator to demonstrate diffraction effects associated with size of the active surface of the conjugator. Peak-to-peak acoustic pressures of 8 MPa and strongly distorted, asymmetric waveforms were measured at the focus of conjugate beams having a fundamental frequency of 5 MHz. Numerical simulations of harmonic generation in the conjugate beams are in agreement with the measurements. The study reveals that the conjugate beams accurately reproduce the focal region of the incident beams when a sufficiently large aperture is used, even when substantial waveform distortion due to nonlinear propagation effects are observed in the conjugate beams.

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Visualization of phase conjugate ultrasound waves passed through inhomogeneous layer

2004

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Focusing of a nonlinear phase-conjugate ultrasonic wave transmitted through a phase-inhomogeneous layer

Cited by 6 publications

References 10 publications

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

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

Focused nonlinear phase-conjugate waves generated by a solid parametric amplifier

Visualization of phase conjugate ultrasound waves passed through inhomogeneous layer

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