Compensation of system nonlinearity in the measurement of acoustic nonlinearity parameters

IF 3.8 2区 物理与天体物理 Q1 ACOUSTICS
Jiung Yoo , Dong-Gi Song , Kyung-Young Jhang
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引用次数: 0

Abstract

The acoustic nonlinearity parameter is determined from the amplitudes of the fundamental and second harmonic component of the acoustic wave propagating through the material. However, the generally used through-transmission based measurements with PZT transducers contain high system nonlinearity, so that the received second harmonic component includes an extra component caused by the transducer, which significantly decrease the reliability of measurements. In this study, we proposed a novel method to reduce the system nonlinearity in the conventional through-transmission based measurements by adding a simple process in which the transmitting and receiving transducers are in direct contact without a specimen. The proposed method was experimentally validated for two materials, Al6061-T6 and Fused Silica. For both materials, several specimens with different thickness were prepared, and the measurement results showed that the magnitude of the second harmonic was proportional to the thickness, but there was an offset due to system nonlinearity. On the other hand, after applying the proposed technique, the offsets were greatly reduced, and furthermore, this performance was maintained even when the transducer setup was changed, and the ratio of nonlinearity parameters measured for the two materials was in good agreement with the known literature value.
测量声学非线性参数时的系统非线性补偿。
声学非线性参数是根据声波在材料中传播时的基波和二次谐波分量的振幅确定的。然而,通常使用的基于 PZT 换能器的穿透式测量包含较高的系统非线性,因此接收到的二次谐波分量包含了由换能器引起的额外分量,这大大降低了测量的可靠性。在这项研究中,我们提出了一种新方法,通过添加一个简单的过程,使发射和接收传感器在没有试样的情况下直接接触,从而降低传统的穿透式测量中的系统非线性。所提出的方法在两种材料(Al6061-T6 和熔融石英)上进行了实验验证。测量结果表明,二次谐波的大小与厚度成正比,但由于系统的非线性,存在偏移。另一方面,在应用所提出的技术后,偏移量大大减少,而且即使改变传感器的设置也能保持这种性能,两种材料测得的非线性参数比率与已知文献值非常一致。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Ultrasonics
Ultrasonics 医学-核医学
CiteScore
7.60
自引率
19.00%
发文量
186
审稿时长
3.9 months
期刊介绍: Ultrasonics is the only internationally established journal which covers the entire field of ultrasound research and technology and all its many applications. Ultrasonics contains a variety of sections to keep readers fully informed and up-to-date on the whole spectrum of research and development throughout the world. Ultrasonics publishes papers of exceptional quality and of relevance to both academia and industry. Manuscripts in which ultrasonics is a central issue and not simply an incidental tool or minor issue, are welcomed. As well as top quality original research papers and review articles by world renowned experts, Ultrasonics also regularly features short communications, a calendar of forthcoming events and special issues dedicated to topical subjects.
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