Nonlinear propagation of phase-conjugate focused sound beams in water

Brysev, A. P.; Krutyansky, L. M.; Preobrazhensky, Vladimir; Pyl'Nov, Y.; Cunningham, K. B.; Hamilton, Mark F.

doi:10.1063/1.1309200

Cited by 3 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 8 displays rms pressures in the time-reversed field ͑a͒ along the axis and ͑b͒ in the focal plane for absorption A f ϭ0.04, focusing gain Gϭ19, and mirror located at m ϭ3.5 with m ϭϱ. These parameters correspond to those of the experiments reported by Brysev et al, 10 who used a source of radius aϭ7.5 mm and focal length dϭ39 mm radiating in water at frequency f ϭ6.23 MHz, with the mirror at distance z m ϭ131 mm. Values of the nonlinearity parameter are varied from N f ϭ0 ͑lin-ear͒ to N f ϭ1 ͑substantial shock formation͒.…”

Section: B Focused Incident Beamsmentioning

confidence: 88%

See 1 more Smart Citation

Time-reversed sound beams of finite amplitude

Cunningham

Hamilton

Brysev

et al. 2001

The Journal of the Acoustical Society of America

View full text Add to dashboard Cite

Numerical simulations based on the nonlinear parabolic wave equation are used to investigate time reversal of sound beams radiated by unfocused and focused sources. Emphasis is placed on nonlinear propagation distortion in the time-reversed beam, and specifically its effect on field reconstruction. Distortion of this kind, due to amplification during time reversal, has been observed in recent experiments [A. P. Brysev et al., Acoust. Phys. 44, 641-650 (1998)]. Effects of diffraction introduced by time-reversal mirrors with finite apertures are also considered. It is shown that even in the presence of shock formation, the ability of time reversal to retarget most of the energy on the source or focal region of the incident beam is quite robust.

show abstract

Section: B Focused Incident Beamsmentioning

confidence: 88%

“…9, 10 We henceforth concentrate on mirrors of infinite radius ( m ϭϱ) in order to emphasize nonlinear effects in the time-reversed field.…”

Section: A Unfocused Incident Beamsmentioning

confidence: 99%