基于 PMN-PT 单晶/环氧 1-3 复合材料的内镜超声径向阵的制作与性能。
Fabrication and performance of endoscopic ultrasound radial arrays based on PMN-PT single crystal/epoxy 1-3 composite.
机构信息
Department of Applied Physics and Materials Research Centre, The Hong Kong Polytechnic University, Hong Kong, China.
出版信息
IEEE Trans Ultrason Ferroelectr Freq Control. 2011 Feb;58(2):477-84. doi: 10.1109/TUFFC.2011.1825.
Abstract
In this paper, 0.7Pb(Mg(¹/₃)Nb(²/₃)O₃-0.3PbTiO₃ (PMN-PT) single crystal/epoxy 1/3 composite was used as the active material of the endoscopic ultrasonic radial array transducer, because this composite exhibited ultrahigh electromechanical coupling coefficient (k(t) = 0.81%), very low mechanical quality factor (Q(m) = 11) and relatively low acoustic impedance (Z(t) = 12 MRayls). A 6.91 MHz PMN-PT/epoxy 1/3 composite radial array transducer with 64 elements was tested in a pulseecho response measurement. The -6-dB bandwidth of the composite array transducer was 102%, which was ~30% larger than that of traditional lead zirconate titanate array transducer. The two-way insertion loss was found to be -32.3 dB. The obtained results show that this broadband array transducer is promising for acquiring high-resolution endoscopic ultrasonic images in many clinical applications.
摘要
本文采用 0.7Pb(Mg(¹/₃)Nb(²/₃)O₃-0.3PbTiO₃(PMN-PT)单晶/环氧树脂 1/3 复合材料作为内窥超声径向阵换能器的有源材料，因为该复合材料表现出超高机电耦合系数（k(t)=0.81%）、极低机械品质因数（Q(m)=11）和相对较低的声阻抗（Z(t)=12 MRayls）。对一个具有 64 个单元的 6.91 MHz PMN-PT/环氧树脂 1/3 复合材料径向阵换能器进行了脉冲回波响应测试。复合材料阵列换能器的-6dB 带宽为 102%，比传统锆钛酸铅阵列换能器大约 30%。发现双向插入损耗为-32.3dB。研究结果表明，这种宽带阵列换能器有望在许多临床应用中获取高分辨率的内窥镜超声图像。
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