A novel sensor for monitoring acoustic cavitation. Part I: Concept, theory, and prototype development
A novel sensor for monitoring acoustic cavitation. Part I: Concept, theory, and prototype development
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DOI：
10.1109/tuffc.2003.1244751
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发表时间：
2003-11
期刊：
影响因子：
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通讯作者：
B. Zeqiri;P. Gélat;M. Hodnett;N. Lee
中科院分区：
文献类型：
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作者：
B. Zeqiri;P. Gélat;M. Hodnett;N. Lee
本文介绍了一种新的概念，超声空化传感器专门设计用于监测由小微气泡产生的声发射时，由施加的声场驱动。其新颖的特点包括一个中空的、端部开口的圆柱形，传感器是一个高32毫米、外径38毫米的直圆柱体，传感器的内径为30毫米;它的内表面由110 /spl μ/m层的压电活性膜，其测量带宽足以使高达和超过10 MHz的声发射被监测。在使用时，传感器浸入液体测试介质中，并监测在传感器的中空主体内发生的高频（兆赫）声发射。为了保护传感器响应免受气缸外部发生的事件的影响，传感器气缸的外表面被封装在特殊的4 mm厚的基于聚乙烯的空化屏蔽内，该空化屏蔽具有专门开发的声学特性，其对40 kHz施加的声场的干扰最小，但对兆赫频率下产生的超声波衰减（1 MHz时平面波传输损耗>30 dB）。本文介绍了新的传感器背后的基本原理，描述了其结构和材料配方计划进行开发的气蚀屏蔽的细节。
This paper describes a new concept for an ultrasonic cavitation sensor designed specifically for monitoring acoustic emissions generated by small microbubbles when driven by an applied acoustic field. Its novel features include a hollow, open-ended, cylindrical shape, with the sensor being a right circular cylinder of height 32 mm and external diameter 38 mm. The internal diameter of the sensor is 30 mm; its inner surface is fabricated from a 110 /spl mu/m layer of piezoelectrically active film whose measurement bandwidth is sufficient to enable acoustic emissions up to and beyond 10 MHz to be monitored. When in use, the sensor is immersed within the liquid test medium and high frequency (megahertz) acoustic emissions occurring within the hollow body of the sensor are monitored. In order to shield the sensor response from events occurring outside the cylinder, the outer surface of the sensor cylinder is encapsulated within a special 4 mm thick polyurethane-based cavitation shield with acoustic properties specifically developed to be minimally perturbing to the 40 kHz applied acoustic field but attenuating to ultrasound generated at megahertz frequencies (plane-wave transmission loss >30 dB at 1 MHz). This paper introduces the rationale behind the new sensor, describing details of its construction and the materials formulation program undertaken to develop the cavitation shield.