## Perturbation theory for scattering of acoustic waves by flaws |

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acoustic wave scattering approximation is concerned Born approximation bracket is associated cavity Cllll DATA VIKTOROV derive variational displacement ducer eigenvalues enclosing surface exact solution excited by unit expect finite FLAWS by G. S. follows from Eq formulae for scattering function of angle G. S. Kino Gauss's theorem Green's function hole ij ij ij n.cr n.dS open circuited antenna outward normal perturb the fields PERTURBATION THEORY perturbing object Plane Wave Scattering power emitted power incident propagation constants Rayleigh wave reaction a,b reaction principle reciprocity relation reciprocity theorem relation for acoustic relation S21 respectively Rumsey sample the power scat scattered amplitude scattered field scattering formula scattering from flaws scattering matrix scattering object SCATTERING OF ACOUSTIC Scattering of Rayleigh scattering theory shear wave source terms surface integrals surface scattering surface source surface wave tering THEORY FOR SCATTERING trans transmitter unit power unperturbed volume source wave from flaw WAVES BY FLAWS zero