Resonance techniques and apparatus for elastic-wave velocity determination in thin metal plates
Resonance techniques and apparatus for elastic-wave velocity determination in thin metal plates
复制标题
薄金属板中弹性波速测定的共振技术和装置
DOI：
10.1063/1.1144776
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
M. Hirao
中科院分区：
文献类型：
--
作者：
G. Petersen;B. Chick;C. Fortunko;M. Hirao
介绍了一种新型脉冲超声共振光谱仪的工作原理。该系统包括：（1）电磁声换能器（EMAT）的使用，（2）类似于Bolef和米勒描述的采样连续波方案的获得声信号的方法，（3）记录线形的Clark方法，以及（4）高功率门控射频放大器和超外差和正交相敏检测电路的独特实现。其结果是一个光谱仪能够测量剪切和纵向超声波速度在非常薄的样品具有更大的再现性比其他脉冲方法。它还适用于测量衰减和其他物理特性，例如可以使用超声波访问的复合材料粘合。薄（1.27和2.49毫米厚）铝板上使用EMAT在0.1-20 MHz范围内的测试的实验结果。
The principles of operation of a new pulsed ultrasonic resonance spectrometer are presented. The system incorporates: (1) the use of electromagnetic‐acoustic transducers (EMATs), (2) a method of obtaining acoustic signals similar to the sampled continuous‐wave scheme described by Bolef and Miller, (3) the Clark method of recording line shapes, and (4) a high power gated rf amplifier and a unique implementation of superheterodyne and quadrature phase sensitive detection circuitry. The result is a spectrometer capable of measuring both shear and longitudinal ultrasonic velocities in very thin samples with much greater reproducibility than other pulse methods. It also has applicability in measuring attenuation and other physical properties such as composite material bonding that can be accessed using ultrasound. Experimental results of tests using EMATs in the 0.1–20 MHz range on thin (1.27 and 2.49 mm thick) aluminum sheets are presented.