Time Reversal Beam Focusing of Ultrasonic Array Transducer on a Defect in a Two Layer Medium

  • Jeong, Hyun-Jo (Division of Mechanical and Automotive Engineering, Wonkwang University) ;
  • Lee, Jeong-Sik (Division of Mechanical and Automotive Engineering, Wonkwang University) ;
  • Bae, Sung-Min (Division of Mechanical and Automotive Engineering, Wonkwang University)
  • 발행 : 2009.06.30

초록

The ability of time reversal techniques to focus ultrasonic beams on the source location is important in many aspects of ultrasonic nondestructive evaluation. In this paper, we investigate the time reversal beam focusing of ultrasonic array sensors on a defect in layered media. Numerical modeling is performed using the commercially available software which employs a time domain finite difference method. Two different time reversal approaches are considered - the through transmission and the pulse-echo. Linear array sensors composed of N elements of line sources are used for signal reception/excitation, time reversal, and reemission in time reversal processes associated with the scattering source of a side-drilled hole located in the second layer of two layer structure. The simulation results demonstrate the time reversal focusing even with multiple reflections from the interface of layered structure. We examine the focusing resolution that is related to the propagation distance, the size of array sensor and the wavelength.

키워드

참고문헌

  1. Chakroun, N., Fink, M. and Wu, F. (1995), Time Reversal Processing in Ultrasonic Nondestructive Testing, IEEE Trans. Ultrason Ferr. Freq. Contr., Vol. 42, pp. 1087-1098 https://doi.org/10.1109/58.476552
  2. Draeger, C., Cassereau, D. and Fink, M. (1997), Theory of the Time-Reversal Process in Solids, J Acoust. Soc. Am., Vol. 102, pp. 1289-1295 https://doi.org/10.1121/1.420094
  3. Draeger, C., Cassereau, D. and Fink, M. (1998), Acoustic Time Reversal with Mode Conversion at a Solid-Fluid Interface, Appl. Phys. Lett., Vol. 72, pp. 1567-1569 https://doi.org/10.1063/1.121117
  4. lng, R. K. and Fink, M. (1996a), Time Recompression of Dispersive Lamb Waves Using a Time Reversal Mirror-Application to Flaw Detection in Thin Plates, IEEE Ultrason. Symp., Vol. 1, pp. 659-663
  5. lng, R. K., Fink, M. and Casula, O. (1996b), Self-Focusing Rayleigh Wave Using a Time Reversal Mirror, Appl. Phys. Lett., Vol. 68, pp. 161-163 https://doi.org/10.1063/1.116134
  6. lng, R. K. and Fink, M. (1998), Time-Reversed Lamb Waves, IEEE Trans. Ultrason. Ferr. Freq. Contr., Vol. 45, pp. 1032-1043 https://doi.org/10.1109/58.710586
  7. Toumat, V., Profunser, D. M., Muramoto, E., Matsuda, O., Takezaki, T., Sueoka, S. and Wright, O. B. (2006), Microscale Multiple Scattering of Coherent Surface Acoustic Wave Packets Probed with GHz Time-Reversal Acoustics, Phys. Rev. E, Vol. 74, pp. 026604/1-5
  8. Tsogka, C. T. and Papanicolaou, G. (2002), Time Reversal through a Solid-Liquid Interface and Super-Resolution, Inverse Problems, Vol. 18, pp. 1639-1657 https://doi.org/10.1088/0266-5611/18/6/314