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首页> 外文会议>Annual Symposium on Quantitative Nondestructive Evaluation; 19980719-24; Snowbird,UT(US) >NONSPECULAR REFLECTION OF ACOUSTIC BEAMS INCIDENT ON ELASTIC PLATES FOR FLUID CHARACTERIZATION
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NONSPECULAR REFLECTION OF ACOUSTIC BEAMS INCIDENT ON ELASTIC PLATES FOR FLUID CHARACTERIZATION

机译：弹性板上非均匀反射声束以表征流体

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摘要

In this work a novel approach to the characterization of liquids by measuring the specific acoustic impedance of the fluid is presented. The method is based on the fluid-induced transformation of the transmission spectrum of an elastic waveguide and has a lot of promising properties: a comparatively simple experimental structure, a good detectability of the receiver voltage minima, where a determination of the absolute signal amplitude is not necessary, a high sensitivity for low liquid densities as well as a controllable sensitivity. Moreover, the separation of the immersion liquid into a coupling fluid above the plate and a fluid with unknown parameters below the plate facilitates a non-invasive measurement technique. As there are, apart from the thickness, no demands on the properties of the elastic layer, it is even conceivable to use the walls of tanks or pipes as reflecting waveguides.
机译：在这项工作中，提出了一种通过测量流体的比声阻抗来表征液体的新颖方法。该方法基于流体诱导的弹性波导传输频谱的转换，并具有许多有希望的特性：相对简单的实验结构，良好的接收电压最小值可检测性，其中绝对信号幅度的确定为不需要，对于低液体密度的高灵敏度以及可控制的灵敏度。此外，将浸没液体分离成板上方的耦合流体和板下方具有未知参数的流体有助于无创测量技术。因为除了厚度之外，对弹性层的性能没有要求，所以甚至可以想到使用罐或管的壁作为反射波导。

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