Design of a 50 MHz annular array using fine-grain lead titanate

Kevin A. Snook, Thomas R. Shrout, K. Kirk Shung

Research output: Contribution to journalConference article

2 Scopus citations

Abstract

A 50 MHz annular array with six equal-area elements was designed. A novel fine-grain, 1-2 micron particle size, lead titanate was used as the piezoelectric material. The full set of electromechanical properties was calculated using resonance techniques. The low permittivity (εs330 = 180) of the lead titanate allowed a larger overall diameter when matching to 50 ohm electronics, which kept the aspect ratio (width/height) of all the elements above 3. Laser micromachining was used to fully separate the array elements, and a double matching layer scheme was used to acoustically match the device. The array was modeled using both one-dimensional (KLM) and finite element modeling (PZFlex), and good agreement between the two was obtained. Using a broadband excitation, a center frequency of 51 MHz was obtained on the echo reflected from a flat reflector, with an insertion loss of 18 dB and a bandwidth of 50%. Maximum calculated cross-talk values were below -30 dB between elements.

Original languageEnglish (US)
Pages (from-to)91-98
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume4687
DOIs
StatePublished - Jan 1 2002
EventMedical Imaging 2002: Ultrasonic Imaging and Signal Processing - San Diego, CA, United States
Duration: Feb 26 2002Feb 28 2002

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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