Laser-based volumetric flow visualization by digital color imaging of a spectrally coded volume

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

Research output: Contribution to journalArticleResearchpeer-review

Abstract

We present the framework for volumetric laser-based flow visualization instrumentation using a spectrally coded volume to achieve three-component three-dimensional particle velocimetry. By delivering light from a frequency doubled Nd:YAG laser with an optical fiber, we exploit stimulated Raman scattering within the fiber to generate a continuum spanning the visible spectrum from 500 to 850 nm. We shape and disperse the continuum light to illuminate a measurement volume of 20×10×4 mm3, in which light sheets of differing spectral properties overlap to form an unambiguous color variation along the depth direction. Using a digital color camera we obtain images of particle fields in this volume. We extract the full spatial distribution of particles with depth inferred from particle color. This paper provides a proof of principle of this instrument, examining the spatial distribution of a static field and a spray field of water droplets ejected by the nozzle of an airbrush.

LanguageEnglish
Article number013710
Pages013710-1-013710-7
Number of pages7
JournalReview of Scientific Instruments
Volume79
Issue number1
DOIs
Publication statusPublished - 2008

Fingerprint

flow visualization
Flow visualization
Color
color
Imaging techniques
Spatial distribution
Lasers
lasers
Stimulated Raman scattering
Volume measurement
spatial distribution
continuums
Velocity measurement
Optical fibers
Nozzles
visible spectrum
Cameras
nozzles
sprayers
YAG lasers

Cite this

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Laser-based volumetric flow visualization by digital color imaging of a spectrally coded volume. / McGregor, T. J.; Spence, D. J.; Coutts, D. W.

In: Review of Scientific Instruments, Vol. 79, No. 1, 013710, 2008, p. 013710-1-013710-7.

Research output: Contribution to journalArticleResearchpeer-review

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