Abstract
The absorption of a plane wave of sound by a spherical absorber is calculated. The calculations are based on the assumption that the state of the sound field at the surface is determined by the normal impedance, which is measured experimentally. By means of previously developed statistics, the absorption coefficients for the spheres in a random sound field are computed from the plane wave absorption coefficients. Absorption measurements made on spheres placed in a reverberation room are compared with the computed values. There is no uncertainty for spheres about the absorption at oblique incidence, as there is for cylinders and flat patches of absorbent material.
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