Identification of resonances of an acoustically rigid sphere

Identification of resonances of an acoustically rigid sphere from simulated input-output data is presented. Scattering from the sphere is formulated using the classic Mie series and the singularity expansion method (SEM). A parametric inverse based on the SEM is discussed. The scattered velocity potential is divided into reflection, first creeping-wave, and second creeping-wave components. The effects on the identification of removing various components of the scattered potential are shown, along with the effects of adding small amounts of noise.