Faculty of Physics
M.V.Lomonosov Moscow State University
Menu
Regular Article

Observation of nonlinear evolution of acoustic pulses in the absence of diffraction

A.N. Dubrovskii, 0.A. Sapozhnikov

Moscow University Physics Bulletin 1993. 48. N 4. P. 60

  • Article
Annotation

The results of experiments are discussed in which a nonlinear evolution of acoustic pulses was observed under specially chosen conditions, where the effect of diffraction was practically ruled out. Acoustic pulses were generated by an optoacoustic method, which enables one to obtain short powerful pulses of predictable shape. The pulses were picked up by a hydrophone based on a polyvinylidene fluoride film. At high peak pressures the evolution of an almost triangular profile with a clearly pronounced discontinuous front was observed. The pulse amplitude decreased in inverse proportion to the root of the distance to the radiator. The experimental results are in good agreement with the classical theory of such waves.

Rissian citation:
А.Н. Дубровский, О.А. Сапожников.
Наблюдение нелинейной эволюции акустических импульсов в отсутствие дифракции.
Вестн. Моск. ун-та. Сер. 3. Физ. Астрон. 1993. № 4. С. 67.
Authors
A.N. Dubrovskii, 0.A. Sapozhnikov
Department of Acoustics, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
Issue 4, 1993

Moscow University Physics Bulletin

Science News of the Faculty of Physics, Lomonosov Moscow State University

This new information publication, which is intended to convey to the staff, students and graduate students, faculty colleagues and partners of the main achievements of scientists and scientific information on the events in the life of university physicists.