Acoustic Bipole and Tripole

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An acoustic bipole consists of two identical monopoles driven in phase (whereas, in a dipole, they are out of phase), separated by a short distance along the axis. As shown in the Details section, the radiated sound produces a directivity pattern , where is measured between the point of observation and the normal of the bipole and stands for the wavenumber.

Contributed by: Enrique Zeleny (January 2014)
Open content licensed under CC BY-NC-SA



The radiation field for a bipole is


where the directivity pattern can be written as


For the tripole


See Part 6 of [1].


[1] P. B. Nagy. "Acoustic Radiators." (Nov 9, 2001) Ultrasonic NDE/.

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