Optimization of Ferroelectret Transducers for Pulse-Echo Water Immersion Operation

2019 IEEE International Ultrasonics Symposium (IUS) Pub Date : 2019-10-01 DOI:10.1109/ULTSYM.2019.8926178

Julio Quirce Aguilar, T. G. Gomez Alvarez-Arenas

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引用次数: 5

Abstract

The adaptation and optimization of polypropylene ferroelectret (FE) films as the main piezoelectric element for water immersion ultrasonic transducers is studied. One of its main features is that they present a very wide band response so they can be an alternative for certain medical applications, especially those demanding intermediate frequencies and reduced size. The main problems of using this kind of materials are the poor sensitivity and the weak bonding of the metallization to the FE film that is easily degraded when entre in contact with water. The objective of this work is to optimize FE transducers for pulse-echo water immersion, while preserving the bandwidth, by: i) protecting the surface and ii) improving the impedance matching to the water.Metallization degradation produced by water has been quantified, then, main materials requirements to produce matching layers for this application are reviewed and potential materials to produce them proposed. A procedure to reinforce the metallization while preserving the electromechanical film response is proposed (based on Au sputtering) and first prototypes of transducers with a single matching layer are proposed, built and characterized.

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用于脉冲回波水浸操作的铁驻极体换能器的优化

研究了聚丙烯铁驻极体(FE)薄膜作为水浸式超声换能器主压电元件的适应性和优化。其主要特点之一是它们具有非常宽的频带响应，因此它们可以成为某些医疗应用的替代方案，特别是那些要求中频和缩小尺寸的应用。使用这种材料的主要问题是灵敏度差，金属化与FE膜的结合弱，当与水接触时容易降解。这项工作的目的是优化脉冲回波水浸泡的FE换能器，同时保持带宽，通过:i)保护表面和ii)改善与水的阻抗匹配。对水产生的金属化降解进行了定量分析，综述了制备金属化降解层所需的主要材料，并提出了制备金属化降解层的潜在材料。提出了一种在保持机电薄膜响应的同时加强金属化的方法(基于Au溅射)，并提出了具有单一匹配层的换能器的第一个原型，构建和表征。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2019 IEEE International Ultrasonics Symposium (IUS)

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