참고문헌

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4. I. Solodov, J. Wackerl, K. Pfleiderer and G. Busse, "A local defect resonance to enhance acoustic wave-defect interaction in ultrasonic nondestructive evaluation," Appl. Phys. Lett., V. 84, Issue 26, pp. 5386-5388 (2004) https://doi.org/10.1063/1.1767283
5. K. Yamanaka, Y. Ohara, S. Yamamoto and T. Mihara, "Ultrasonic evaluation of closed cracks using subharmonic / superharmonic phased array and a laser interferometer," 4th Pan American Conference for NDT, Oct. 22-26, Buenos Aires, Argentina (2007)