A Modified Thickness Extensional Disk Transducer

Susan E. Trolier, Q. C. Xu, R. E. Newnham

Research output: Contribution to journalArticlepeer-review


Photolithography and chemical etching were investigated as a means of patterning miniature piezoelectric devices. Using a processing procedure analogous to that utilized in the production of integrated circuitry, concentrated hydrochloric acid and a commercially available photoresist were employed to fabricate a number of complex structures from soft lead zirconate titanate (PZT) substrates. Among the devices produced in this manner was a modified thickness mode resonator etched in order to destroy the simple geometry responsible for radial vibrations. The resultant transducer demonstrated significantly smaller amplitudes for lateral resonances and a marked reduction in the effective planar coupling coefficient over the unaltered disk. Consequently, it appears that photolithographic patterning will prove useful both in eliminating spurious resonances from transducers for medical imaging or nondestructive evaluation and for engineering low planar coupling coefficients into a variety of Substrate materials.

Original languageEnglish (US)
Pages (from-to)839-842
Number of pages4
JournalIEEE transactions on ultrasonics, ferroelectrics, and frequency control
Issue number6
StatePublished - Nov 1988

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Acoustics and Ultrasonics
  • Electrical and Electronic Engineering


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