Single Crystal Relaxor-Based Ferroelectrics Offer a Quantum

Period of Performance: 05/15/1998 - 05/14/2000

$1.19MM

Phase 2 SBIR

Recipient Firm

Tetrad Corp.
357 Inverness Dr. South
Englewood, CO 80112
Principal Investigator

Abstract

The goal of this program is to apply recent advancements in the growth of piezoelectric single crystal materials to build ultrasound transducers with very broad bandwidth, which can improve and simplify ultrasound imaging for combat casualty care. Relaxor-based ferroelectric materials of PZN-PT and PMN-PT have been shown to have coupling factors for some modes of over 90%. Transducer modeling shows that these properties can theoretically lead to transducers with exceptionally wide bandwidth (over 120%). The set of procedures which would be useful for external imaging during triage in a combat casualty care would take up to three transducers of standard construction ranging from 3.5 MHz to 7.5 MHz in center frequency. If a transducer with 120% bandwidth can be constructed, that single transducer can perform all of those imaging functions. The program is directed first toward construction of first a 1-D linear array to demonstrate the performance level achievable. This will be followed by a multi-row array that can mimic 3.5 MHz through 7.5 MHz arrays both temporally, by proper filtering, and spatially, by variation of elevation aperture size. Options are included to demonstrate that the measured performance achieved can be used to produce high quality images over the frequency range claimed.