【Title】Application of chaotic cavity transducer in nonlinear elastic detection

【Author】LI Yifeng~1 JIANG Zhuo~2 (1 College of Electronics and Information Engineering, Nanjing University of Technology Nanjing 210009) (2 School of Computer science and Technology, BeiHua University Jilin 132013)

【Abstract】The conjunction of "Chaotic Cavity Transducer(CCT)" focusing with Nonlinear Elastic Wave Spectroscopy(NEWS)methods has been discussed in the detection of the localization of micro-damage.CCT focusing is a combination process of CCT with the techniques of acoustic Time Reversal(TR)or Inverse Filter(IF),which can improve the ability of localization. In order to improve the quality of focalization, in the experimental process the chirped excitation source signal and inverse filtering techniques have been used. A focusing process in a non-reverberant composite plate sample and an image of a crack in a steel sample demonstrate the focalization ability and high efficiency of imaging of the combination of CCT with NEWS, and proves that CCT can efficiently overcome the problems of "phantom" image and increasement of the strain at the boundary of medium.