Detecting echoes of different spectral characteristics in absorbing media by variable moving bandwidth SSP minimization

Split Spectrum Processing (SSP) improves the detection of ultrasonic echoes. Generally, this method uses an algorithm named minimization. One limitation of this processing is the fact that the spectrum of echoes must be known and invariant. That restricts the field of SSP when ultrasound waves are attenuated. In this work, we propose a new scheme for the minimization process, allowing the ultrasonic investigation in absorbing material. We give an example of this method applied to a thermal spray polymer.