Damage detection in pipes based on acoustic excitations using laser-induced plasma

Itsuro Kajiwara, Ryosuke Akita, Naoki Hosoya

Research output: Contribution to journalArticle

8 Citations (Scopus)


A health-monitoring system is proposed to detect holes drilled in a pipe based on laser plasma acoustic excitations and acoustic measurements. In this system, an acoustic excitation is applied to a pipe via a laser-induced plasma in air generated by a high-power Nd: YAG pulse laser. Laser-induced plasmas can realize non-contact acoustic impulse excitations. A microphone is used to measure the time response of the acoustic pressure. In this study, we focus on the detection of a hole in the pipe. The reflection of the acoustic wave due to a hole drilled in the pipe induces a change in the time response of the acoustic pressure. Applying a continuous wavelet transform to the measured time response data with/without the hole can locate the position of the hole. This study demonstrates the effectiveness of the present damage detection method based on an acoustic excitation using a laser-induced plasma.

Original languageEnglish
Pages (from-to)570-579
Number of pages10
JournalMechanical Systems and Signal Processing
Publication statusPublished - 2018 Oct 1



  • Acoustic excitation
  • Damage detection
  • Health monitoring
  • Laser-induced plasma
  • Wavelet transform

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Signal Processing
  • Civil and Structural Engineering
  • Aerospace Engineering
  • Mechanical Engineering
  • Computer Science Applications

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