多电极压电微机械超声换能器

F. Sammoura, Sina Akhari, Nawal Aqab, M. Mahmoud, Liwei Lin
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引用次数: 17

摘要

具有多个电极的压电微机械超声换能器(pMUTs)具有增强的有效机电耦合因子,比最先进的单电极设计高出约211%。在这项工作中,建立了一个用于圆形,夹紧的均匀pmut的机电耦合理论模型,并通过已发表的单电极结构实验结果进行了验证。采用厚度为5 μm的多晶硅结构层、厚度为2 μm的PZT压电层、半径为135 μm的4电极设计,有效机电耦合率为13.72%,比传统的单电极pMUT提高了211%。因此,在各种超声波转导应用中,如手势识别和医学成像,多电极pmut可以取代最先进的单电极pmut,用于高机电耦合。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Multiple electrode piezoelectric micromachined ultrasonic transducers
Piezoelectric micromachined ultrasonic transducers (pMUTs) with multiple electrodes were shown to have enhanced effective electromechanical coupling factors, about 211% larger than that of the state-of-the-art, single electrode design. In this work, a theoretical model of the electromechanical coupling is developed for the circular-shape, clamped unimorph pMUTs and validated with published experimental results on single electrode structures. A 4-electrode design with a 5 μm-thick poly-Si structural layer, 2 μm-thick PZT piezoelectric layer, and 135 μm in radius has an effective electromechanical coupling of 13.72%, which is 211% higher than that of a conventional single-electrode pMUT. As such, multiple electrode pMUTs could replace the state-of-art, single-electrode pMUTs for high electromechanical coupling in various ultrasonic transduction applications, such as gesture recognition and medical imaging.
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