Design of matching layers for high-frequency ultrasonic transducers
Design of matching layers for high-frequency ultrasonic transducers
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DOI：
10.1063/1.4931703
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发表时间：
2015-09-21
影响因子：
4
通讯作者：
Zhou, Qifa
中科院分区：
文献类型：
--
作者：
Fei, Chunlong;Ma, Jianguo;Zhou, Qifa
将高频（>= 100 MHz）超声换能器的声阻抗与水性加载介质匹配仍然是制造高频换能器的挑战。传统的匹配层设计在给定对特定声阻抗和精确厚度两者的要求的情况下建立高匹配性能方面存在问题。基于质量弹簧方案和微波匹配网络分析，我们将金属-聚合物层连接以获得匹配效果。这两种方法都有希望指导金属-聚合物匹配层的设计。一个100 MHz的铌酸锂换能器制造，以验证这两个匹配层设计的性能。在脉冲回波实验中，换能器回波幅度比非匹配条件下提高了84.4%，-6dB带宽从30.2%提高到58.3%，表明匹配层设计方法对研制高频超声换能器是有效的。(C)2015 AIP Publishing LLC.
Matching the acoustic impedance of high-frequency (>= 100 MHz) ultrasound transducers to an aqueous loading medium remains a challenge for fabricating high-frequency transducers. The traditional matching layer design has been problematic to establish high matching performance given requirements on both specific acoustic impedance and precise thickness. Based on both mass-spring scheme and microwave matching network analysis, we interfaced metal-polymer layers for the matching effects. Both methods hold promises for guiding the metal-polymer matching layer design. A 100 MHz LiNbO3 transducer was fabricated to validate the performance of the both matching layer designs. In the pulse-echo experiment, the transducer echo amplitude increased by 84.4% and its -6dB bandwidth increased from 30.2% to 58.3% comparing to the non-matched condition, demonstrating that the matching layer design method is effective for developing high-frequency ultrasonic transducers. (C) 2015 AIP Publishing LLC.