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Article title TO THE ISSUE OF THE INFLUENCE OF A THIN BIOLOGICAL STRUCTURE ON PARAMETERS OF THE FIELD OF ACOUSTIC PARAMETRIC ANTENNA IN ECOLOGICAL MONITORING
Authors N. P. Zagray, N. N. Chernov, A. S. Zhardetskaya
Section SECTION I. HYDROACOUSTIC METHODS FOR ECOLOGICAL MONITORING OF THE OCEAN
Month, Year 08, 2017 @en
Index UDC 222.22
DOI 10.23683/2311-3103-2017-8-16-26
Abstract Uniform in the properties of layers in liquid media with thicknesses from a few millimeters to tens of meters, separated from each other by different boundary layers with abrupt changes in thermodynamic characteristics form the region of propagation and nonlinear interaction of waves of an acoustic parametric antenna. A subtle structure of a stepped nature is observed up to the deepest depths, but the magnitude of the amplitudes of these inhomogeneities decrease with depth in proportion to the decrease in the gradients of the smoothed profiles. Thus, for an acoustic parametric antenna for which the propagation medium and nonlinear interaction is part of this antenna in addition to the active primary field pump transducer, the fine structure of the ocean will directly affect the formation of its field in space. In the case of a thin horizontal structure of the medium in which the acoustic waves propagate and the nonlinear interaction of acoustic waves, the region of such interaction can be represented by a set of horizontal layers, in each of which physical and acoustic parameters: linear and nonlinear are constant. The boundary conditions on transitions from one layer to another can turn out to be essential. If the contacting media are liquids, then the tangential stresses at the boundaries can be considered practically absent, which is a simplifying element of the solution of the problem. For the structure of layers of solid-state media, the boundary conditions make it necessary to take into account the possible boundary nonlinearity. Theoretically, cases are considered when the region of nonlinear interaction is a set of horizontal layers, up to second-order smallness, and the contribution of the secondary point sources in each layer to the general field of the acoustic parametric antenna is determined. The nature and degree of influence of the fine structure on the parameters of the acoustic parametric antenna are studied. The results and conclusions of the research allow us to identify the main practical applications both for monitoring purposes and for controlling the properties of discrete layered media.

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Keywords Sound propagation; nonlinear interaction; layered structures; ecological monitoring.
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