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

Itsuro Kajiwara, Ryosuke Akita, Naoki Hosoya

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

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
Volume111
DOIs
Publication statusPublished - 2018 Oct

Keywords

  • 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

Fingerprint Dive into the research topics of 'Damage detection in pipes based on acoustic excitations using laser-induced plasma'. Together they form a unique fingerprint.

Cite this