Quality assessment of acoustic color signatures

Acoustic color is a representation of the spectral response over aspect, typically in 2-D. This representation aims to characterize the structural acoustic phenomena associated with an object with frequency and aspect as the two axes of choice. However, the strongest acoustic color signatures are typically the geometric features of an object due to geometric scattering. Naturally, these geometric features are well-represented as straight-line signatures in the spatial spectrum representation with the axes horizontal and vertical wavenumbers. Elastic responses due to other scattering mechanisms such as Rayleigh scattering or Mie scattering are typically smaller in magnitude, and are not easily recognizable or separable from the stronger responses. This work explores variants of acoustic color, to find intuitive representations for these types of scattering responses, and to assess their signature quality.