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首页> 外文期刊>Journal of Applied Physics >Time reversed acoustics techniques for elastic imaging in reverberant and nonreverberant media: An experimental study of the chaotic cavity transducer concept
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Time reversed acoustics techniques for elastic imaging in reverberant and nonreverberant media: An experimental study of the chaotic cavity transducer concept

机译：混响和非混响介质中弹性成像的时间反向声学技术：混沌腔换能器概念的实验研究

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摘要

In view of emerging imaging technologies based on the combination of Time Reversed Acoustics (TRA) with Nonlinear Elastic Wave Spectroscopy (NEWS) for the detection and localization of micro-damage in solids, we have investigated the benefits of chirped source signal excitation, inverse filtering techniques, and the implementation of chaotic cavity transducers to improve the quality of energy focusing, especially for weakly reverberant media. Chaotic cavity transducer focusing is defined as the hardware-software combination of a piezoelectric ceramic glued on a cavity of chaotic shape on the one hand with the reciprocal Time Reversal (or Inverse Filter) technique on the other hand. Experimental data for reverberant and nonreverberant composite plates show that the use of chirps, inverse filtering and chaotic cavity transducers significantly enhances the focusing process, and enables focusing in a nonreverberant medium using only one transducer. As a potential exploitation, the application of the chaotic cavity transducer concept for synthetic imaging is examined, revealing several properties similar to phased arrays.
机译：鉴于新兴的基于时间反向声学（TRA）与非线性弹性波谱（NEWS）结合的成像技术，用于检测和定位固体中的微损伤，我们研究了chi声源信号激励，逆滤波的好处技术，以及实施混沌腔换能器以提高能量聚焦的质量，尤其是对于弱混响介质。混沌腔换能器聚焦的定义是，一方面将压电陶瓷粘在混沌形状的腔上，另一方面将其与倒数时间倒置（或逆滤波器）技术相结合。混响和非混响复合板的实验数据表明，使用chi，逆滤波和混沌腔换能器可显着增强聚焦过程，并且仅使用一个换能器即可在非混响介质中聚焦。作为一种潜在的开发方法，研究了混沌腔换能器概念在合成成像中的应用，揭示了类似于相控阵的几种特性。

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  • 来源
    《Journal of Applied Physics》 |2011年第10期|p.1053-1062|共10页
  • 作者

    Bart Van Damme; Koen Van Den Abeele; YiFeng Li; Olivier Bou Matar;

  • 作者单位

    Wave Propagation and Signal Processing Research Group, K.U.Leuven Campus Kortrijk, E. Sabbelaan 53,B-8500 Kortrijk, Belgium;

    Wave Propagation and Signal Processing Research Group, K.U.Leuven Campus Kortrijk, E. Sabbelaan 53,B-8500 Kortrijk, Belgium;

    College of Electronics and Information Engineering, Nanjing University of Technology, Nanjing, 210009,China;

    International Associated Laboratory, LEMAC, IEMN, UMR, CNRS, 8520 PRES Lille Nord de France,ECLille, Fr-59652 Villeneuve d'Ascq, France;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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