R Latif et al 2003 Meas. Sci. Technol. 14 1063 doi:10.1088/0957-0233/14/7/322
R Latif1,2, E Aassif2, A Moudden2 and B Faiz2
Show affiliationsIn this paper, we suggest a technique for carrying out a high-resolution time–frequency analysis based on a modified version of the Wigner–Ville distribution. The impulse response backscattered by an aluminium and steel tube immersed in water is analysed using this method. As will be demonstrated, this approach has the desirable attributes of eliminating all interference terms manifested on the time–frequency plane and of allowing one to visualize more clearly the evolution of the reduced frequency ka of the symmetric S0 and antisymmetric A1 circumferential waves over time. This analysis allows us to determine much more accurately the cut-off reduced frequency of the antisymmetric circumferential wave A1.
43.60.+d Acoustic signal processing
Issue 7 (July 2003)
Received 3 July 2002, accepted for publication 6 May 2003, in final form 3 March 2003
Published 17 June 2003
R Latif et al 2003 Meas. Sci. Technol. 14 1063
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