基于频率相位编码激励的超声检测仿真

Q3 Engineering

International Journal of Computational Materials Science and Surface Engineering Pub Date : 2019-08-14 DOI:10.1504/IJCMSSE.2019.10023225

Xinyu Zhao, Jiaying Zhang, S. Cong, T. Gang

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引用次数: 2

摘要

将大时宽乘积编码信号和脉冲压缩技术引入超声检测中。线性调频（LFM）激励通常用于提高时间分辨率，但应抑制旁瓣以检测附近较小的缺陷。巴克编码激励通常用于抑制旁瓣，但结果的时间分辨率低于线性调频激励。因此，为了获得更高的时间分辨率和更低的旁瓣电平，提出了频率相位编码激励。所提出的激励信号是将LFM应用于巴克码的每个子脉冲，它被称为LFM-B13。仿真结果表明，当使用60%带宽的5MHz中心频率换能器时，LFM-B13激励的时间分辨率比LFM激励高出约40%，LFM-B1 3激励的主旁瓣电平比LFM激发低约4dB。

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The simulation for ultrasonic testing based on frequency-phase coded excitation

Large time-bandwidth product coded signal and pulse compression are introduced into ultrasonic testing. Linear frequency modulation (LFM) excitation is usually used to improve time resolution, but sidelobe should be suppressed to detect smaller flaws nearby. Barker coded excitation is usually used to suppress sidelobe, but time resolution of results is lower than LFM excitation. So frequency-phase coded excitation is proposed to obtain higher time resolution and lower sidelobe level. The proposed excitation signal is applying LFM to each sub-pulse of Barker code, and it is called LFM-B13. The results of simulations demonstrate that, time resolution of LFM-B13 excitation is approximately 40% higher than that of LFM excitation, and main sidelobe level of LFM-B13 excitation is approximately 4 dB lower than that of LFM excitation, when 60% bandwidth of 5 MHz central frequency transducers are used.

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来源期刊

International Journal of Computational Materials Science and Surface Engineering Engineering-Engineering (all)

CiteScore

1.20

自引率

0.00%

发文量

期刊介绍： IJCMSSE is a refereed international journal that aims to provide a blend of theoretical and applied study of computational materials science and surface engineering. The scope of IJCMSSE original scientific papers that describe computer methods of modelling, simulation, and prediction for designing materials and structures at all length scales. The Editors-in-Chief of IJCMSSE encourage the submission of fundamental and interdisciplinary contributions on materials science and engineering, surface engineering and computational methods of modelling, simulation, and prediction. Papers published in IJCMSSE involve the solution of current problems, in which it is necessary to apply computational materials science and surface engineering methods for solving relevant engineering problems.