Z. Ye et Dm. Farmer, ACOUSTIC SCATTERING FROM SWIM-BLADDER FISH AT LOW-FREQUENCIES, The Journal of the Acoustical Society of America, 96(2), 1994, pp. 951-956
Models of acoustic resonant scattering from swim-bladder fish are sens
itive to the choice of damping coefficient and resonance frequency. Ex
isting theory does not provide a consistent representation of the role
played by tissue surrounding the swim bladder in determining this coe
fficient and empirical fits are therefore often used to adjust model p
arameters for specific examples. In an attempt to provide a firmer the
oretical basis for the interpretation of experimental results, it is s
hown how the elastic properties of the tissue can be combined with the
swim bladder in a consistent way. Although the analysis must eventual
ly be extended to swim bladders of arbitrary shape, for simplicity the
essential features are illustrated with a spherical geometry. The res
ults emphasize the need for accurate measurement of the bulk elastic p
roperties of tissue, specifically the complex shear modulus.