Enhancing the performance of piezoelectric ultrasound transducers by the use of multiple matching layers
Enhancing the performance of piezoelectric ultrasound transducers by the use of multiple matching layers
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DOI：
10.1093/imamat/hxn030
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发表时间：
2008-12-01
影响因子：
1.2
通讯作者：
Pethrick, Richard A.
中科院分区：
文献类型：
--
作者：
Mulholland, Anthony J.;Ramadas, Nishal;Pethrick, Richard A.
建立了多匹配层复合压电换能器的线性系统模型。该模型中的大量自由度以及器件性能对这些参数的敏感性使得选择这些参数来优化器件性能的逆问题成为一项极其困难的任务。然而，通过接受对设备中传播波的性质的少量假设，使用切比雪夫多项式方法来降低自由度并得出设备设计的算法。用这种方法研究了一个典型的器件，结果表明，与标准的单匹配层设计相比，器件性能可以提高三倍。该模型还表明，在将匹配层粘合在一起时必须非常小心，以确保键的均匀性。随后制造了具有四个匹配层的换能器，实验结果表明器件性能有显着改善，与模型预测一致。
A linear system model is developed for a composite piezoelectric transducer with multiple matching layers. The large number of degrees of freedom in this model and the sensitivity of the device performance to these parameters make the inverse problem, of choosing these parameters to optimize the device's performance, an extremely difficult task. However, by accepting a small number of assumptions on the nature of the propagating waves in the device a Chebyshev polynomial approach is used to reduce the degrees of freedom and arrive at an algorithm for a device design. A typical device is investigated using this approach and it is shown that a threefold improvement in the device performance can be achieved over the standard single-matching-layer design. The modelling also indicated that great care has to be taken in bonding the matching layers together to ensure the homogeneity of the bonds. A transducer with four matching layers was subsequently manufactured and the experimental results show a significant improvement in the device performance, in agreement with the model predictions.