Title :
Detecting echoes of different spectral characteristics in absorbing media by variable moving bandwidth SSP minimization
Author :
Cudel, Christophe ; Grevillot, Michel ; Meyer, Jean-Jacques ; Simonin, Laurence ; Jacquey, Serge
Author_Institution :
Lab. E1/MIPS, Univ. de Haute Alsace, Mulhouse, France
Abstract :
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.
Keywords :
acoustic signal processing; echo; ultrasonic absorption; ultrasonic propagation; absorbing media; echoes; minimization; spectral characteristics; split spectrum processing; thermal spray polymer; ultrasonic echoes; variable moving bandwidth SSP minimization; Attenuation; Bandwidth; Filter bank; Frequency diversity; Minimization methods; Optical microscopy; Signal processing; Signal to noise ratio; Thermal spraying; Ultrasonic imaging;
Conference_Titel :
Ultrasonics Symposium, 2002. Proceedings. 2002 IEEE
Print_ISBN :
0-7803-7582-3
DOI :
10.1109/ULTSYM.2002.1193516