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Article title ECOLOGICAL MONITORING OF THE WATER ENVIRONMENT WITH ACOUSTIC INTERACTION OF ACOUSTIC WAVES
Authors N. P. Zagray
Section SECTION III. METHODS AND MEANS OF FLAW DETECTION AND NON-DESTRUCTIVE TESTING
Month, Year 08, 2017 @en
Index UDC 534.222
DOI 10.23683/2311-3103-2017-8-151-162
Abstract We consider the solution of the theoretical problem and its possible applied values in de-scribing the distributions of the density of the secondary waves of sources in the nonlinear interac-tion of acoustic waves in the propagation medium, thereby realizing the diagnostics of the ecological state of the aquatic environment. This is due to the unique feature of the effect of the volume of the diagnosed medium on the result and the parameters of the nonlinear interaction of acoustic elastic waves propagating in this medium. In this case, various cases of limiting the region of nonlinear interaction are possible. Different spatial geometry of the nonlinear interaction zone is considered for different forms of both the radiating surface and the shape of the surface of the effective zone of the nonlinear interaction. The retarded potential method makes it possible to extend the range of problems under consideration in the field of combination situations for various real cases of nonlinear interaction of acoustic waves used in environmental monitoring. The expressions obtained in the general case determine the pressure field of any of the combinational frequencies of the generated spectrum for small processes of wave attenuation and diffraction. A model is proposed for describing the nonlinear interaction of acoustic waves with allowance for the limitation of the region of nonlinear interaction by a surface of an arbitrary kind, as well as the change in the magnitude of their propagation velocity in the channel space. In this case, it is possible to implement various laws of dependence of both the type of the constraint surfaces and the speed of sound on the vertical transverse coordinate, using the appropriate representations of the pump wave fields. Such a method makes it possible to assess the influence of unevenness of the surface of the bottom of controlled water areas. The solution leads to finding the amplitude angular distributions of the secondary APA field in the far zone for an arbitrary form of the nonlinear interaction constraint surface and, in general, any configuration of the area shape of the active radiator of the antenna. These distributions will depend on the physical properties of the medium in which the nonlinear interaction of propagating acoustic waves occurs. Thus, these parameters, determined as a result of monitoring, will contain information about their changes in the ecological state of the diagnosed areas of the environment.

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Keywords Nonlinear interaction of propagating acoustic waves; ecological diagnostics; extension of the nonlinear interaction region; physical properties of the medium; virtual secondary point sources, directional characteristics.
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