Subsurface defect detection using phase evolution of line laser-generated Rayleigh waves

Dan Chen, Gaolong Lv, Shifeng Guo, Rui Zuo, Yanjun Liu, Kaixing Zhang, Zhongqing Su, Wei Feng

Research output: Journal article publicationJournal articleAcademic researchpeer-review

29 Citations (Scopus)


An unreported phenomenon of phase evolution of Rayleigh ultrasonic waves with subsurface defects is observed and systematically explored for detection of subsurface defects using non-contact line laser ultrasonic technique and numerical simulation. The mechanism of phase evolution of Rayleigh wave signals is explained by the interference of the reflected and direct Rayleigh wave, explored by finite element analysis. Both experiments and simulation show distinct peak evolution of the Rayleigh wave signals with the width and depth of subsurface defect. A dimensionless parameter (|Neg|/Pos), defined by the ratio of absolute negative peak to positive peak of Rayleigh wave, is proposed to evaluate the phase evolution of Rayleigh wave with defect width and depth, which is further used to quantify the subsurface defects. The phase evolution of Rayleigh waves can act as a robust and sensitive feature to detect subsurface defects using laser-generated ultrasound, which has promising applications in life prediction and health monitoring of various engineering structures.

Original languageEnglish
Article number106410
JournalOptics and Laser Technology
Publication statusPublished - Nov 2020


  • Laser ultrasonics
  • Nondestructive evaluation
  • Phase evolution
  • Rayleigh wave
  • Subsurface defects

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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