Acoustic testing in a very small space based on a point sound source generated by laser-induced breakdown: Stabilization of plasma formation

Naoki Hosoya, Masaki Nagata, Itsuro Kajiwara

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34 Citations (Scopus)

Abstract

This paper proposes a method of acoustic testing based on a point source generated by laser-induced breakdown in air. A high-power neodymium-yttrium- aluminum-garnet pulse laser is used in this system for generating the laser-induced breakdown in acoustic fields. Plasma formation can be realized by the laser-induced breakdown if the local intensity of the laser beam reaches 1015 W/m2. The shock wave that is yielded by consuming a part of the plasma energy becomes a sound source. Assuming that the laser beam is focused to a small volume through a convex lens and the sound source by the laser induced-breakdown has nondirectional property, it is possible to create a point source with this technique. Securing the laser light path installs no device for acoustic excitation in acoustic fields. The system is validated by comparing the resonant frequencies of a very small space measured by the laser-induced breakdown and calculated by theoretical model.

Original languageEnglish
Pages (from-to)4572-4583
Number of pages12
JournalJournal of Sound and Vibration
Volume332
Issue number19
DOIs
Publication statusPublished - 2013 Sep 16

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ASJC Scopus subject areas

  • Acoustics and Ultrasonics
  • Condensed Matter Physics
  • Mechanical Engineering
  • Mechanics of Materials

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