Beamforming with a volumetric array of massless laser spark sources—Application in reflection tracking

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Details

Original languageEnglish
Pages (from-to)EL389-EL395
JournalJournal of the Acoustical Society of America
Volume137
Issue number6
Publication statusPublished - 2015
MoE publication typeA1 Journal article-refereed

Researchers

  • Joona Eskelinen
  • Symeon Delikaris-Manias
  • Javier Gómez Bolaños
  • Edward Hæggström
  • Ville Pulkki

Research units

Abstract

A volumetric array of laser-induced air breakdown sparks is used to produce a directional and steerable acoustic source. The laser breakdown array element is broadband, point-like, and massless. It produces an impulse-like waveform in midair, thus generating accurate spatio-temporal information for acoustic beamforming. A laser-spark scanning setup and the concept of a massless steerable source are presented and evaluated with a cubic array by using an off-line far field delay-and-sum beamforming method. This virtual acoustic array with minimal source influence can, for instance, produce narrow transmission beams to obtain localized and directional impulse response information by reflection tracking.

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