Laser-based volumetric colour-coded three-dimensional particle velocimetry

T. J. McGregor*, D. J. Spence, D. W. Coutts

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


We present a method of three-dimensional particle velocimetry with a single digital colour camera using multiple colour illumination to encode image depth over a large volume. A copper vapour laser operating at 511 nm is used to pump an optical fibre producing a multiple-wavelength beam via multiple order stimulated Raman scattering. The beam is dispersed and formed into a stack of thin sheets to illuminate a volume of space. The spatial co-ordinates of particles imaged within the illuminated volume are obtained from their imaged x, y positions with depth discerned from particle hue (set by the wavelength of illumination). The method exhibits an RMS depth error of 3% in relation to the thickness of the illuminated region. This paper reports a proof-of-principle of three-dimensional particle imaging using a multi-wavelength laser source with a view to 3D-3C particle velocimetry.

Original languageEnglish
Pages (from-to)882-889
Number of pages8
JournalOptics and Lasers in Engineering
Issue number8
Publication statusPublished - Aug 2007


  • 3D-3C PIV
  • image techniques
  • image analysis
  • laser diagnostics
  • laser imaging


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