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2004, 10

D. A. Kas’yanov, G. E. Fiks, G. M. Shalashov

Diffraction method for focusing of acoustic fields radiated by extended borehole antennas

language: English

received 21.03.2004, published 18.08.2004

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ABSTRACT

One way to make a focusing borehole antenna using diffraction focusing of the acoustic field is considered. The primary attention is paid to the methods of partition of an extent borehole antenna cylindrical aperture into areas with antiphase excitation for the formation of a cylindrical zone lens. It is shown that, there is also an alternative method besides the classical Fresnel zones partition. Specific features of the elastic field distributions in the massif, created by different zone lenses, are examined. Applicability of focusing borehole antennas, designed as zone lenses, in geotechnologies is discussed.

10 pages, 6 figures

Сitation: D. A. Kas’yanov, G. E. Fiks, G. M. Shalashov. Diffraction method for focusing of acoustic fields radiated by extended borehole antennas. Electronic Journal “Technical Acoustics”, http://www.ejta.org, 2004, 10.

REFERENCES

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Kas’yanov Dmitrii Al’bertovich, PhD, Head of the Department “Acoustics and Seismophysics” in Radiophysical Research Institute.
Areas of interest: Nonlinear Acoustics, Geo-acoustics, Ultrasonic equipment creating and producing.

e-mail: kasd(at)nirfi.sci-nnov.ru
 
 

Fiks Galina Efimovna, researcher, Applied Physics Institute RAS.
Area of interest: computer simulation.
 
 

Shalashov Gennady Mikhailovich, PhD, senior researcher in Radiophysical Research Institute.
Areas of interest: Nonlinear Acoustics, Seismophysics.