Fabrication of a 40 MHz Single Element Ultrasonic Transducer Using a PMN-PT Single Crystal
Fabrication of a 40 MHz Single Element Ultrasonic Transducer Using a PMN-PT Single Crystal
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使用 PMN-PT 单晶制造 40 MHz 单元件超声波换能器
DOI：
10.4028/www.scientific.net/kem.321-323.978
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
M. Choi
中科院分区：
文献类型：
--
作者：
D. Paeng;Hyung Ham Kim;Sang Goo Lee;S. Rhim;M. Choi
PMN-PT是一种压电单晶，由于其高的机电耦合系数(K33)和高介电常数和高压电常数，已被认为是一种较好的换能器阵列材料。即使对于使用相对较高的kT和较低的衰减和速度色散的高频单元件换能器，它也可能是好的。然而，由于PMN-PT极易破碎，且对换能器的面积和厚度要求较小，因此利用PMN-PT制作高频换能器具有一定的挑战性。用KLM模型模拟了一个40 MHz的单元件换能器，该换能器包括两个匹配层和一个导电衬底。仿真结果表明，PMN-PT换能器的灵敏度和带宽均优于40 MHz的LiNbO_3换能器。研制了40 MHz PMN-29%PT换能器，获得了脉冲回波信号并进行了分析。其灵敏度为-48db，-6db带宽约为48%。
PMN-PT, a piezoelectric single crystal, has been known to be a better material for transducer arrays due to its high electromechanical coupling coefficient (k33) and high dielectric and piezoelectric constants. It may also be good even for high frequency single element transducers using relatively high kt and low attenuation and velocity dispersion. However, it’s challenging to fabricate high frequency transducers using PMN-PT since it is easily breakable and requires small area and thickness of the transducer. A KLM model was used to simulate a 40 MHz single element transducer including 2 matching layers and a conductive backing. The simulation showed that the PMN-PT transducer turned out to be better in sensitivity and bandwidth than a 40 MHz LiNbO3 transducer. A 40 MHz PMN-29%PT transducer was fabricated and the pulse echo signals were obtained and analyzed. Its sensitivity was found to be –48 dB and –6dB bandwidth was about 48 %.
影响因子：
3.2
作者：
Park, SE;Shrout, TR
通讯作者：
Shrout, TR