Animations for Acoustics Education

Quadrupoles

These need a bit more work . . .

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  The 3-D far field radiation pattern, |pressure|, of a longitudinal quadrupole. Here the quadrupole is aligned along the z axis, and the radiation pattern is proportional to (Cos[theta])^2 where the angle theta is measured down from the z axis. Sometimes longitudinal quadrupoles are called axial quadrupoles.

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  The 3-D far field radiation pattern, |pressure|, of a lateral quadrupole. Here the quadrupole is aligned in the x-y plane, and the radiation pattern is proportional to Cos[phi]*Sin[phi]*(Sin[theta])^2 where the angle theta is measured down from the z axis, and the angle phi is measured around the z axis from the x axis. Sometimes lateral quadrupoles are called tesseral quadrupoles.

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  Two ways of making a lateral quadrupole. Two closely spaced out of phase dipoles, either represented as four correctly phased monopoles or two out of phase moving objects. (80K)

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Most recent update: 2/5/2001
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