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首页> 外文期刊>電子情報通信学会技術研究報告. 超音波. Ultrasonics >Medical ultrasonic transducer using composite materials for acoustic matching layers-computer simulations of transducer arrays
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Medical ultrasonic transducer using composite materials for acoustic matching layers-computer simulations of transducer arrays

机译：医疗超声换能器使用复合材料进行声学匹配层 - 电脑模拟换能器阵列

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摘要

Increasing the sensitivity of transducer arrays in a medical diagnostic system and decreasing mechanical-coupling between the adjacent elements are intrinsic problems. The use of quarter-wave matching layers as impedance transformation has been a standard practice for attaining high conversion efficiency of transducer arrays. The transducer arrays under consideration were conventional ones with two matching layers on piezoelectric elements. The simulations of the transducer arrays indicated that Poisson's ratio of the matching layers gives a great affect on the sensitivity and the mechanical-coupling between the adjacent elements. That is, the characteristics of the arrays are improved, as the Poisson's ratio is smaller. Carbon-epoxy unidirectional composite mixed with tungsten powder and high strength polyethylene fiber-polyurethane rubber allows the realization of the materials with a Poisson's ratio below 0.1, where the materials have an optimum acoustic impedance for the matching layers. From these facts we found that the improvement of the transducer arrays can be expected by adopting the composite materials to the matching layers. Satisfactory results have been obtained in computer simulations of the transducer array model based on the characteristic data of newly proposed composite materials.
机译：提高换能器阵列在医学诊断系统中的敏感度和相邻元件之间的机械耦合减少是内在的问题。使用四分之一波匹配层作为阻抗转换是实现换能器阵列的高转换效率的标准实践。正在考虑的换能器阵列是具有两个压电元件上的两个匹配层的常规组。换能器阵列的模拟表明，匹配层的泊松比率对相邻元件之间的灵敏度和机械耦合产生了很大的影响。也就是说，随着泊松的比率较小，阵列的特性得到改善。与钨粉和高强度聚乙烯纤维 - 聚氨酯橡胶混合的碳 - 环氧单向复合材料允许在0.1以下的泊松比的实现，其中材料对匹配层具有最佳声阻抗。从这些事实来看，我们发现通过采用复合材料将复合材料采用匹配层，可以预期换能器阵列的改进。基于新提出的复合材料的特征数据，在换能器阵列模型的计算机模拟中获得了令人满意的结果。

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