Fabrication and performance of a high-frequency geometrically focussed composite transducer with triangular pillar geometry

被引：5

作者：

Brown, J. A. ^{[1
]}

Cherin, E. ^{[1
]}

Yin, J. ^{[1
]}

Foster, F. S. ^{[1
]}

机构：

[1] Univ Toronto, Toronto, ON, Canada

来源：

2007 IEEE ULTRASONICS SYMPOSIUM PROCEEDINGS, VOLS 1-6 | 2007年

关键词：

D O I：

10.1109/ULTSYM.2007.33

中图分类号：

O42 [声学];

学科分类号：

070206 ; 082403 ;

摘要：

A single-element, 40 MHz, 3 mm diameter transducer was fabricated with a geometric focus at 9 mm. The transducer was based on a piezo-composite substrate with triangular-shaped composite pillars. The transducer produced pulses with a two-way bandwidth of 55%. The bandwidth and impedance magnitude were in agreement with that predicted using finite element modeling. A one-way radiation pattern was collected using a needle hydrophone. The one-way -3 dB beamwidth at the geometric focus was measured to be 120 mu m and the -3 dB depth-of-field was 25 mm. This is in good agreement to the theoretical predictions of 112.5 mu m and 2.4 mm. The triangular-pillar composite transducer was then compared to a transducer with square composite pillars. A 12 dB reduction in the amplitude of the secondary resonance was found for the triangular-pillar composite.

引用

页码：80 / 83

页数：4