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介绍了混沌腔体换能器(Chaotic Cavity Transducer:CCT)聚焦与非线性弹性波谱(Nonlinear Elastic Wave Spectroscopy:NEWS)法的结合在材料微观缺陷检测中的应用。CCT聚焦是CCT与声学时间反转(Time Reversal:TR)技术或反向滤波(Inverse Filter:IF)技术相结合的过程,此过程能够有效提高聚焦检测的能力。为了提高聚焦的质量,实验过程中采用了线性调频激发信号源及反向滤波技术。非混响的合成平板介质材料的聚焦过程及钢介质材料裂纹的成像检测结果证实了CCT与NEWS的结合在非线性聚焦及成像过程的高效性,及CCT在应用过程中克服幻影成像问题及边界应变增加问题的有效性。
This paper introduces the application of the combination of Chaotic Cavity Transducer (CCT) focusing and nonlinear elastic spectroscopy (NEWS) in the detection of micro-defects in materials. CCT focusing is a combination of CCT and Time Reversal (TR) or Inverse Filter (IF) techniques, which can effectively improve the ability of focus detection. In order to improve the quality of the focus, the experimental process uses a linear FM excitation signal source and reverse filtering technology. Non-reverberation of the composite plate dielectric material focusing process and the crack detection of the steel dielectric material test results confirm the combination of CCT and NEWS non-linear focusing and imaging process efficiency, and CCT in the application process to overcome the problem of phantom imaging and the border The effectiveness of the problem of increasing strain.