Electronic Journal Technical Acoustics ISSN 1819-2408

E. Sosedko, A. Bulanov

Non-stationary scattering of high-frequency pulses and acoustic spectroscopy of resonant inclusions in liquids

language: Russian

received 30.10.2018, published 16.11.2018

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ABSTRACT

Studies of transient processes in the dynamics of resonant inclusions under the action of acoustic pulses with different frequencies have been carried out. It is shown that an excited signal at its own switching frequency has a sufficiently high amplitude for its registration under typical experimental conditions. The implementation of the method of non-stationary pulsed acoustic spectroscopy based on the non-stationary mode of scattering of any high-frequency acoustic pulses with subsequent low-frequency filtering of signals from resonant bubbles is proposed. The most significant disadvantage of acoustic spectroscopy methods in the applications broadband and frequency-tunable signals is the complexity of their implementation in practice. Since they require complex equipment, sufficiently powerful sound pulses and a complex signal reception system, which should be automatically rebuilt synchronously in accordance with the frequency composition of the emitted signals. In this paper, we propose a significantly simplified approach based on unsteady scattering of acoustic pulses, which preserves the capabilities of acoustic spectroscopy. Acoustic spectroscopy has high noise immunity due to two circumstances: 1) non-stationary scattering with conversion to a low frequency is quite large; 2) there is no interference at the pumping frequency at a low frequency - there is only a useful signal indicating the presence of resonant inclusions. Non-stationary scattering allows acoustic spectroscopy of resonant inclusions in linear and nonlinear modes.
Key words: acoustic spectroscopy, nonlinear oscillations, acoustic nonlinearity, bubbles

8 pages, 4 figures

Сitation: E. Sosedko, A. Bulanov.. Non-stationary scattering of high-frequency pulses and acoustic spectroscopy of resonant inclusions in liquids. Electronic Journal “Technical Acoustics”, http://www.ejta.org, 2018, 4.

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		Ekaterina Sosedko is a research scientist at the Pacific Oceanological Institute, laboratory of nonlinear dynamical systems since 1997. Ph.D. in physics in 2003. Research interests are the study of the nonlinear dynamics of gas bubbles in a liquid. The goal of the research is the development of theoretical concepts for describing the nonlinear dynamics of gas inclusions in liquids and explaining various experimentally observed effects on their basis: the generation of the subharmonic component below the threshold, the shape of acoustic radiation lines during cavitation, the spatial and dispersed distribution of bubbles in the near-surface and bottom layers of the ocean. Recent studies have also included the study of the motion of an ensemble of interacting classical particles and the formation of macroclusters (macromolecules) in the field of a spatially periodic potential. In recent years, Ekaterina Sosedko participated in the study of the influence of different amplitudes and frequencies of standing acoustic waves on the nature of optical breakdown inside a liquid in the field of high-power ultrasound. E-mail: s_kat(at)mail.ru
		Alexey Bulanov is a senior scientist at the Pacific Oceanological Institute, laboratory of satellite oceanology and laser sensing since 2007. Ph.D. in Physics in 2009. Research interests are mainly related to the study of the behavior of optical (laser) breakdown in gases and condensed media. Recent studies are related to the study of the mechanisms of interaction of laser radiation of a liquid under the influence of ultrasound, the study of laser breakdown, the dynamics of plasma expansion, the formation and growth of bubbles in the later stages in various liquid media, the development of laser breakdown spectroscopy under the action of ultrasound, the study of laser breakdown of various liquids depending on the power of ultrasound.