Observation and interpretation of mode splitting in positive rayleigh wave dispersion characteristics

Author

Beldi, I. ; Hadjoub, Z. ; Doghmane, A. ; Gacem, A.

Author_Institution

Dept. de Phys., Univ. Badji-Mokhtar, Annaba, Algeria

fYear

2009

fDate

10-12 Dec. 2009

Firstpage

1

Lastpage

4

Abstract

In this paper, we investigate the positive dispersive behavior of Rayleigh velocity for several layer/substrate combinations: Cr/quartz, SiO₂/Mo, SiO₂/stainless steel and Cr/Mo. The simulation conditions were those usually used in conventional acoustic microscopy. It was found that a second mode appears next to that of Rayleigh, unlike the usual unique dispersive curve. Moreover, this new mode has a negative dispersive behavior which is not likely to happen in the rigidity effect. This unusual phenomenon is interpreted by the acoustic impedance mismatching between layers and substrates.

Keywords

Rayleigh waves; acoustic impedance; acoustic microscopy; chromium; silicon compounds; surface acoustic waves; Cr-Mo; Cr-SiO₂; FeCCrJk; Mo; Rayleigh velocity; SiO₂; SiO₂-FeCCrJk; SiO₂-Mo; acoustic impedance mismatching; acoustic microscopy; mode splitting; negative dispersive behavior; positive Rayleigh wave dispersion characteristics; rigidity effect; surface acoustic waves; Acoustic devices; Acoustic materials; Acoustic waves; Chromium; Dispersion; Frequency; Microscopy; Steel; Substrates; Water; Rayleigh velocity; acoustic impedance; acoustic microscopy; elastic parameters; layers;

fLanguage

English

Publisher

ieee

Conference_Titel

ICTON Mediterranean Winter Conference,2009. ICTON-MW 2009. 3rd

Conference_Location

Angers

Print_ISBN

978-1-4244-5745-8

Electronic_ISBN

978-1-4244-5746-5

Type

conf

DOI

10.1109/ICTONMW.2009.5385533

Filename

5385533