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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >A nondestructive integrity test for membrane filters based on air-coupled ultrasonic spectroscopy
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A nondestructive integrity test for membrane filters based on air-coupled ultrasonic spectroscopy

机译：基于空气耦合超声光谱的膜滤器无损完整性测试

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摘要

This work describes the application of an ultrasonic air-coupled characterization technique to membrane filters. Coefficient of transmission of sound at normal incidence through each membrane in the frequency range 0.55 MHz-2.4 MHz was measured. For all cases, at least one thickness resonance was observed. From these measurements density, velocity, and attenuation of ultrasonic longitudinal waves are calculated and compared to available filtration data such as water flux measurements and bubble point data, both provided by manufacturers. Results show that velocity of ultrasonic waves in membrane filters depends on the membrane grade and can be correlated to filtration properties; attenuation per wavelength is independent of membrane grade but sensitive to moisture content. Advantages of this technique over other conventional membrane tests are pointed out.
机译：这项工作描述了超声空气耦合表征技术在膜过滤器上的应用。在0.55MHz-2.4MHz的频率范围内，测量了垂直入射的声音通过每个膜的传输系数。在所有情况下，至少观察到一个厚度共振。根据这些测量结果，可以计算出超声波纵波的密度，速度和衰减，并将其与制造商提供的可用过滤数据（例如水通量测量值和泡点数据）进行比较。结果表明，超声波在膜过滤器中的速度取决于膜的等级，并可能与过滤性能相关。每个波长的衰减与膜等级无关，但对水分含量敏感。指出了该技术相对于其他常规膜测试的优势。

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