Finite Element Modeling and Wave Propagation Analysis for Lens-Less Line Focus Acoustic Microscopy

IF 0.8 4区工程技术 Q4 ACOUSTICS

International Journal of Acoustics and Vibration Pub Date : 2017-12-01 DOI:10.20855/IJAV.2017.22.4498

Guorong Song, Qin Dengqian, Lyu Yan, Guangfu Hong, Xu Yuyang, Wu Bin, He Cunfu

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引用次数: 1

Abstract

A finite element method for simulation of lens-less line focus acoustic microscopy is proposed in this paper to nondestructively evaluate the leaky surface wave (LSW) velocity. The defocusing measurement model is established, in which the geometrical focusing radius will be 20 mm. The piezoelectric polyvinylidene fluoride film is selected as the active element. The excitation is a standard black Harris wavelet signal with a centre frequency of 5 MHz. Simulations of measurements on typical bulk materials (Al) are carried out. Then, the time-resolved wave signal series are acquired when the defocusing distance varies continuously. The LSW velocity will be easily determined by the examination of the slope of the LSW’s arrival time versus the defocusing position. The LSWs’ propagating path will be analyzed geometrically in time-domain. Meanwhile, the LSWs’ velocities are also extracted by applying the specially developed digital signal processing algorithm to the defocusing experimental data, which is called V (f, z) analysis method based on two-dimensional fast Fourier transform. Finally, the relationship between the time-resolved method and the V (f, z) technique is discussed, in which the interpretation of the formation of surface waves and the description of its analysing methods will be given.

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无透镜线聚焦声学显微镜的有限元建模和波传播分析

本文提出了一种模拟无透镜线聚焦声学显微镜的有限元方法，以无损地评估漏表面波（LSW）的速度。建立了离焦测量模型，其中几何聚焦半径为20mm。选择压电聚偏氟乙烯薄膜作为有源元件。激励是中心频率为5MHz的标准黑哈里斯小波信号。对典型大块材料（Al）的测量结果进行了模拟。然后，当散焦距离连续变化时，获取时间分辨波信号序列。通过检查LSW的到达时间相对于散焦位置的斜率，可以容易地确定LSW速度。LSW的传播路径将在时域中进行几何分析。同时，还将专门开发的数字信号处理算法应用于散焦实验数据，提取了LSW的速度，称为基于二维快速傅立叶变换的V（f，z）分析方法。最后，讨论了时间分辨方法与V（f，z）技术之间的关系，其中将给出表面波形成的解释及其分析方法的描述。

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

International Journal of Acoustics and Vibration ACOUSTICS-ENGINEERING, MECHANICAL

CiteScore

1.60

自引率

10.00%

发文量

审稿时长

12 months

期刊介绍： The International Journal of Acoustics and Vibration (IJAV) is the refereed open-access journal of the International Institute of Acoustics and Vibration (IIAV). The IIAV is a non-profit international scientific society founded in 1995. The primary objective of the Institute is to advance the science of acoustics and vibration by creating an international organization that is responsive to the needs of scientists and engineers concerned with acoustics and vibration problems all around the world. Manuscripts of articles, technical notes and letters-to-the-editor should be submitted to the Editor-in-Chief via the on-line submission system. Authors wishing to submit an article need to log in on the IJAV website first. Users logged into the website are able to submit new articles, track the status of their articles already submitted, upload revised articles, responses and/or rebuttals to reviewers, figures, biographies, photographs, copyright transfer agreements, and send comments to the editor. Each time the status of an article submitted changes, the author will also be notified automatically by email. IIAV members (in good standing for at least six months) can publish in IJAV free of charge and their papers will be displayed on-line immediately after they have been edited and laid-out. Non-IIAV members will be required to pay a mandatory Article Processing Charge (APC) of $200 USD if the manuscript is accepted for publication after review. The APC fee allows IIAV to make your research freely available to all readers using the Open Access model. In addition, Non-IIAV members who pay an extra voluntary publication fee (EVPF) of $500 USD will be granted expedited publication in the IJAV Journal and their papers can be displayed on the Internet after acceptance. If the $200 USD (APC) publication fee is not honored, papers will not be published. Authors who do not pay the voluntary fixed fee of $500 USD will have their papers published but there may be a considerable delay. The English text of the papers must be of high quality. If the text submitted is of low quality the manuscript will be more than likely rejected. For authors whose first language is not English, we recommend having their manuscripts reviewed and edited prior to submission by a native English speaker with scientific expertise. There are many commercial editing services which can provide this service at a cost to the authors.