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流体-镀层基底界面波的传播特性

马琦 胡文祥 徐琰锋 王浩

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流体-镀层基底界面波的传播特性

马琦, 胡文祥, 徐琰锋, 王浩

Propagation properties of interface waves at fluid-coated solid interface

Ma Qi, Hu Wen-Xiang, Xu Yan-Feng, Wang Hao
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  • 理论分析了脉冲激光激发的流体-分层固体结构声场,在此基础上数值计算了流体-慢层快底固体和流体-快层慢底固体结构液-固界面Scholte波的频散特性与瞬态响应. 数值结果显示,对于流体-慢层快底结构,Scholte界面波呈现出正常频散特性;而对于流体-快层慢底结构,Scholte波在较小的频厚积范围呈反常频散特性. 理论瞬态信号也显示了同样的特性. 采用脉冲激光激励,用水听器接收的方式进行了Scholte界面波的实验测量. 实验测量和分析结果与理论结果有很好的一致性. 此工作可为水浸检测条件下镀层与薄膜材料参数的超声无损表征、海底沉积物参数反演等应用提供理论基础.
    The interface waves propagating along liquid-solid interface are widely studied and used in a lot of fields, especially in ocean acoustics, ocean engineering, and ocean geophysics. The dispersion characteristics of this kind of interface wave are closely related to the seafloor medium parameters, which is an effective means for the inversion of the seafloor sediments. However, the interface wave is difficult to use for ultrasonic nondestructive material characterization, especially for stiff and dense solid materials, owing to the mode shape or wave structure of the liquid-solid interface waves.The fraction of the total wave energy that travels in the fluid compared with the solid depends on the properties of the solid material. Usually, for a stiff and dense solid compared with the fluid, most of the energy travels in the fluid, while for a soft solid more energy travels in the solid. Therefore, it is difficult to use this kind interface wave for stiff solid material characterization. However, in the case of liquid-coated solid interface, the behaviors and properties of interface waves are quite different.In this paper, we use pulsed laser to generate the interface waves at the water-coated solid interfaces. The theoretical analysis of the laser-induced excitation of acoustic waves propagating along a plane interface between liquid and layered elastic solid is perforemd first. The general solution for the interface motion is derived. The analytic expression of the transient response is then obtained. Based on this expression, the dispersion characteristics of the interface waves, which propagate along the fluid-coated solid interface for the cases of slow coating on fast substrate and fast coating on slow substrate, are calculated and analyzed. The transient response signals are further calculated. In the case of slow coating on fast substrate, the interface wave shows an evident dispersion, in which its phase velocity is larger than its group velocity. In the case of fast coating on slow substrate, the interface wave also shows a remarkable dispersion within a smaller frequency-thickness product range, in which its phase velocity is less than its group velocity. The theoretical transient signals show the same properties.In order to verify the theoretical results, an experimental system is set up, and the interface waves are generated and measured. The experimental system mainly consists of pulsed laser, hydrophone, oscilloscope, and movable translation stage. The pulsed laser is used to excite the interface waves, and the hydrophone mounted on the movable translation stage is placed near the interface to receive the signals. Two kinds of samples of slow coating on fast substrate and fast coating on slow substrate are made and measured. The recorded testing signals are then processed and analyzed.The theoretical results and the experimental ones are in good agreement. The research results presented in this paper can provide theoretical basis for ultrasonic nondestructive characterization of coating and film material in immersion testing mode, and also for seafloor sediment parameter inversion.
      通信作者: 胡文祥, wxhu@tongji.edu.cn
    • 基金项目: 国家自然科学基金(批准号:11374230)资助的课题.
      Corresponding author: Hu Wen-Xiang, wxhu@tongji.edu.cn
    • Funds: Project supported by the National Natural Science Foundation of China (Grant No. 11374230).
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  • [1]

    Glorieux C, Rostyne K V, Nelson K, Gao W, Lauriks W, Thoen J 2001 J. Acoust. Soc. Am. 110 1299

    [2]

    van Dalen K N, Drijkoningen G G, Smeulders D M J, Heller H K J, Glorieux C, Sarens B, Verstraeten B 2011 J. Acoust. Soc. Am. 130 1299

    [3]

    Potty G R, Miller J H 2012 Proceedings of the 3rd International Conference on Ocean Acoustics AIP Publishing November, 2012 p500

    [4]

    Nguyen X N, Dahm T, Grevemeyer I 2009 J. Seismol. 13 543

    [5]

    Bohlen T, Kugler S, Klein G, Theilen F 2004 Geophysics 69 330

    [6]

    Ali H B, Bibee L D 1992 Proc. IEEE 1 465

    [7]

    Zhu J, Popovics J S 2006 Geophys. Res. Lett. 33 L09603

    [8]

    Farnell G, Adler E 1972 Elastic Wave Propagation in Thin Layers in Physical Acoustics (Vol. IX) (New York: Academic Press) pp35-127

    [9]

    Lowe M J S 1995 IEEE Trans. Ultrason. Ferroelectr. Freq. Control 42 525

    [10]

    Hu W X, Qian M L 2000 Chin. J. Acoust. 19 174

    [11]

    Ma Q, Hu W X 2014 Proceedings of the 21st International Congress on Sound and Vibration Beijing, China, July 13-17, 2014

    [12]

    McDonald F A 1990 Appl. Phys. Lett. 56 230

    [13]

    D Alleyne, P Cawley 1991 J. Acoust. Soc. Am. 89 1159

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计量
  • 文章访问数:  5294
  • PDF下载量:  141
  • 被引次数: 0
出版历程
  • 收稿日期:  2016-12-06
  • 修回日期:  2017-01-23
  • 刊出日期:  2017-04-05

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