Acoustic imaging by nonlinear low frequency manipulation of high frequency scattering and propagation properties

摘要

Acoustic imaging provides images with reduced reverberation noise and images of nonlinear scattering and propagation parameters of the object. The received signal from transmitted dual frequency band acoustic pulse complexes is processed with overlapping high and low frequency pulses. The high frequency pulse is used for image reconstruction and the low frequency pulse manipulate the nonlinear scattering and/or propagation properties of the high frequency pulse. The scattered signal from a single dual band pulse complex for filtering in the fast time (depth time) domain provides a signal with suppression of reverberation noise with 1st harmonic sensitivity and increased spatial resolution. Through filtering in the pulse number coordinate and corrections for nonlinear propagation delays, a linear back scattering signal with suppressed pulse reverberation noise, a nonlinear back scattering signal, and quantitative nonlinear forward propagation and scattering parameters are extracted.