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1. 发明授权

US5866819A Ultrasonic thickness measurement of multilayer structures 失效
标题翻译：多层结构超声波厚度测量
公开(公告)号：US5866819A
公开(公告)日：1999-02-02
申请号：US910124
申请日：1997-08-13
申请人： Dan Albu , Salem M. Taboun
发明人： Dan Albu , Salem M. Taboun
IPC分类号： G01B17/02 , G01N29/06 , G01N29/10
CPC分类号： G01B17/025 , G01N2291/044
摘要： A non-destructive method and apparatus for determining the thickness of individual layers of different materials in a multilayer structure particularly useful in analyzing the layers in a multilayer plastic fuel tank, utilizes a constant and relatively high frequency ultrasonic pulse transmitted into the multilayer structure and records the time when interference pulses are received to determine the thickness of the individual layers in the multilayer structure. The interference pulses are generated at the interface between adjacent layers of sufficiently different materials and thus, the time between interference pulses is a function of the amount of time needed for the ultrasonic pulse to pass through a layer of material. The duration between reflected pulses is called the transmission time which is the time for the ultrasonic frequency to originally pass through the material and also the time for the reflected pulse to bounce back to the transducer and is thus equal to twice the time needed for the ultrasonic pulse to pass through the layer. Therefore, the thickness of a layer within a multilayer structure can be readily computed as one-half of the transmission time multiplied by the speed of sound through the material comprising that layer.
摘要翻译：一种非破坏性的方法和装置，用于确定在多层结构中特别可用于分析多层塑料燃料箱中的层的不同材料的各层的厚度，利用传输到多层结构中的恒定且相对高频的超声波脉冲并记录接收干涉脉冲以确定多层结构中各层的厚度的时间。干扰脉冲是在相互充分不同的材料层之间的界面处产生的，因此干涉脉冲之间的时间是超声波脉冲穿过一层材料所需的时间量的函数。反射脉冲之间的持续时间称为传输时间，这是超声频率最初通过材料的时间，反射脉冲的时间也称为反射回传感器的时间，因此等于超声波所需时间的两倍脉冲通过层。因此，多层结构中的层的厚度可以容易地计算为传输时间的一半乘以包含该层的材料的声速。

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