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An ultrasonic theoretical and experimental approach to determine thickness and wave speed in layered media

机译:确定分层介质中厚度和波速的超声理论和实验方法

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摘要

This work presents an ultrasonic method to characterize the layers of a stratified medium, using independent measurements of wave speed and thickness of each layer. The model, based on geometrical acoustics, includes refraction. Two transducers are used: one active (3.4 MHz) and a hydrophone as a receptor, which is moved laterally through 15 positions. The distance between the transducers and the delay between the echoes, from the interfaces separating the layers, received by them are used to estimate the speed and thickness. Three types of layered phantoms were used: Ph1 made with alcohol/acrylic, Ph2 made with polyvinyl chloride/water/acrylic, and Ph3 made with acrylic/water/polyvinyl chloride. The experimental results for speed of sound and layer thickness presented an experimental mean relative error, for thickness and wave speed, lower than 7.0% and 6.6%. respectively
机译:这项工作提出了一种超声波方法,通过独立测量每层的波速和厚度来表征分层介质的层。基于几何声学的模型包括折射。使用了两个传感器:一个有源传感器(3.4 MHz)和一个水听器作为接收器,可横向移动15个位置。换能器之间的距离和回波之间的延迟(由分离各层的界面接收)被它们接收,用于估计速度和厚度。使用了三种类型的分层体模:由酒精/丙烯酸制成的Ph1,由聚氯乙烯/水/丙烯酸制成的Ph2和由丙烯酸/水/聚氯乙烯制成的Ph3。声速和层厚的实验结果表明,厚度和波速的实验平均相对误差分别低于7.0%和6.6%。分别

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