Layer guided shear horizontal acoustic plate mode sensors

Glen McHale, Michael Newton, Fran Martin

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A dispersion equation is derived for shear horizontally polarized acoustic waves propagating on a finite thickness substrate covered by a finite thickness guiding layer with a shear acoustic speed less than that of the substrate. It is shown that the equation has two types of solution corresponding to traditional Love waves and to shear horizontally polarized acoustic plate modes (SH-APMs). Numerical calculations show that each Love wave mode has an associated spectrum of layer-guided acoustic plate modes and that higher order Love wave modes are continuations of the layer-guided SH-APMs. Further, it is shown that the mass sensitivity is related to the slope of the dispersion equation and that layer-guided SH-APMs have far higher mass sensitivity than non-layer-guided SH-APMs. Sensors based on these layer-guided SH-APM modes may have advantages for liquid phase operation because the mode can be excited using the opposite face to that used for sensing. Preliminary experimental results are presented for the dispersion curve of layer-guided SH-APMs. The effect of guiding layer thickness, high and multiple frequency operation and dispersion is discussed for Love waves on a (semi-) infinite substrate.
Original languageEnglish
Title of host publicationFrequency Control Symposium and PDA Exhibition, 2002. IEEE International
Place of PublicationUnited States
PublisherIEEE PES
Pages225-233
Number of pages9
ISBN (Print)0-7803-7082-1
DOIs
Publication statusPublished - 2002

Keywords

  • Acoustic wave
  • Love wave
  • Sensor
  • SH-APM

Fingerprint

Dive into the research topics of 'Layer guided shear horizontal acoustic plate mode sensors'. Together they form a unique fingerprint.

Cite this