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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 22 — Oct. 27, 2008
  • pp: 17870–17881

Application of structured illumination for multiple scattering suppression in planar laser imaging of dense sprays

Edouard Berrocal, Elias Kristensson, Mattias Richter, Mark Linne, and Marcus Aldén  »View Author Affiliations

Optics Express, Vol. 16, Issue 22, pp. 17870-17881 (2008)

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A novel approach to reduce the multiple light scattering contribution in planar laser images of atomizing sprays is reported. This new technique, named Structured Laser Illumination Planar Imaging (SLIPI), has been demonstrated in the dense region of a hollow-cone water spray generated in ambient air at 50 bars injection pressure. The idea is based on using an incident laser sheet which is spatially modulated along the vertical direction. By properly shifting the spatial phase of the modulation and using post-processing of the successive recorded images, the blurring effects from multiple light scattering can be mitigated. Since hollow-cone sprays have a known inner structure in the central region, the efficiency of the method could be evaluated. We demonstrate, for the case of averaged images, that an unwanted contribution of 44% of the detected light intensity can be removed. The suppression of this diffuse light enables an increase from 55% to 80% in image contrast. Such an improvement allows a more accurate description of the near-field region and of the spray interior. The possibility of extracting instantaneous flow motion is also shown, here, for a dilute flow of water droplets. These results indicate promising applications of the technique to denser two-phase flows such as air-blast atomizer and diesel sprays.

© 2008 Optical Society of America

OCIS Codes
(100.2980) Image processing : Image enhancement
(280.2490) Remote sensing and sensors : Flow diagnostics
(290.4210) Scattering : Multiple scattering
(110.0113) Imaging systems : Imaging through turbid media

ToC Category:
Imaging Systems

Original Manuscript: September 2, 2008
Revised Manuscript: October 9, 2008
Manuscript Accepted: October 15, 2008
Published: October 20, 2008

Edouard Berrocal, Elias Kristensson, Mattias Richter, Mark Linne, and Marcus Aldén, "Application of structured illumination for multiple scattering suppression in planar laser imaging of dense sprays," Opt. Express 16, 17870-17881 (2008)

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