Vol. 3, issue 07, article # 19

pdf Larin V. L., Perkalskis B. Sh., Root A. G., Sotiriadi G. N. Selective acoustic antenna. // Atmospheric and oceanic optics. 1990. V. 3. No. 07. P. 718-720.
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Abstract:

Acoustic phase zone plates for focusing sound in air are described. The directional patterns and the amplitude-frequency characteristics are presented.