Dispersion Behaviors of ASF Modes Propagating along Wedges Tips with Coatings

  • Po-Shien Tung
  • Sheng-Wei Tang
  • Che-Hua Yang
Conference paper
Part of the IUTAM Bookseries book series (IUTAMBOOK, volume 26)


Acoustic sensors frequently rely on the detection of small mass changes that results from binding of a coated layer coupled to the active sensor surface. Anti-symmetric flexural (ASF) modes are anti-symmetric type of guided waves propagating along the tip of wedge-shaped waveguides. Like surface acoustic waves, ASF can be a potential candidate for the purpose of acting as acoustic sensors. This paper employs a combined numerical and experimental study for the dispersion behaviors of ASF modes propagating along wedge tips with a layer of coating. The numerical study is based on finite element method while the experimental study employs a laser ultrasound technique. Velocity for the ASF mode propagating along the wedge tip with a slower coating is found out to start at the ASF velocity of the matrix wedge at the low frequency regime, and gradually influenced by the coating as the frequency increases. Enhanced loaded effects from the coating are founded due to the wedge tip geometry. In general, the numerical results show good agreement with the measurements.


Surface Acoustic Wave Apex Angle Dispersion Behavior Signal Processing Scheme Wedge Sample 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Talbi, A., Sarry, F., Elhakiki, M., Brizoual, L.Le.: ZnO/quartz structure potentiality for surface acoustic wave pressure sensor. Sens. Actuators A 128 78-83 (2006).CrossRefGoogle Scholar
  2. 2.
    Lagasse, P.E.: Analysis of dispersion free guide for elastic waves. Electron. Lett. 8 372 (1972).CrossRefGoogle Scholar
  3. 3.
    Lagasse, P.E., Mason I.M., Ash E.A.: Microwave Theory and Technique, IEEE Trans. Sonics Ultrason. 20 143-154 (1973).Google Scholar
  4. 4.
    McKenna, J., Boyd, G.D., Thurston R.N.: Plate theory solution for guided flexural acoustic waves along the tip of a wedge, IEEE Trans. Sonics and Ultrasonics. 21 178-186 (1974).Google Scholar
  5. 5.
    Krylov, V.V., Shanin, A.V.: Scattering of an acoustic wedge wave by a shallow notch. Sov. Phys. Acoust. 37 65 (1991).Google Scholar
  6. 6.
    Krylov, V.V., Parker, D.F.: Harmonic generation and parametric mixing in wedge acoustic waves. Wave Motion. 15 185 (1992).CrossRefGoogle Scholar
  7. 7.
    Chamuel, J.R.: Edge waves along immersed elastic elliptical wedge with range dependent apex angle. J. Acoust. Soc. Am. 95 2893 (1994).CrossRefGoogle Scholar
  8. 8.
    Chamuel, J.R.: Flexural edge waves along free and immersed elastic wave guides. Review of Progress in Quantitative Nondestructive Evaluation 16 129-136 (1997).Google Scholar
  9. 9.
    Jia, X., De Billy, M.: Observation of the dispersion behavior of surface acoustic waves in a wedge waveguide by laser ultrasonics. Appl. Phys. Lett. 61 2970-2972 (1992).CrossRefGoogle Scholar
  10. 10.
    Yang, C.-H., Tsai, K.-Y.: Assessment of anisotropy and Apex Truncation Effects of the Piezoelectric Wedges. Jpn. J. Appl. Phys. 43 4392 (2004).CrossRefGoogle Scholar
  11. 11.
    Yang, C-.H., Liaw, J.-S.: A comparison laser ultrasound measurements and finite-element simulations for dispersion behavior of anti-symmetric flexural modes propagating along wedge tips with coatings. Jpn. J. Appl. Phys. 39 2741 (2000).CrossRefGoogle Scholar
  12. 12.
    Farnell, G.W., Adler, E.L. Physical Acoustics, Mason, W.P., Thurston R.N., (eds.), 9, 35 Academic Press, New York (1972).Google Scholar
  13. 13.
    Alleyne, D.N., Cawley, P.: A two-dimensional fourier transform method for the measurement of propagating multimode signals. J. Acoust. Soc. Am. 89 159 (1991).CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  1. 1.Graduate Institute of Manufacturing TechnologyNational Taipei University of TechnologyTaipeiTaiwan
  2. 2.Graduate Institute of Mechanical and Electrical EngineeringNational Taipei University of TechnologyTaipeiTaiwan

Personalised recommendations