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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 33, Iss. 23 — Dec. 1, 2008
  • pp: 2752–2754

High-speed structured planar laser illumination for contrast improvement of two-phase flow images

E. Kristensson, E. Berrocal, M. Richter, S.-G. Pettersson, and M. Aldén  »View Author Affiliations

Optics Letters, Vol. 33, Issue 23, pp. 2752-2754 (2008)

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A high-speed method to remove blurring effects caused by multiple scattering in planar laser images of two-phase flows is demonstrated. The technique is based on structured illumination and is for the first time to our knowledge applied on a dynamic medium. As structured illumination requires three successive images to be recorded and to freeze the flow motion in time, a high-speed laser and imaging system is employed. We show that by using a time delay of 55 μ s between the images a single-shot representation of a dilute flow of water droplets can be achieved. By having an additional inner stream with known structure and composition, the efficiency of the method is quantitatively evaluated, showing an increase from 58% to 93% in image contrast. Such an improvement allows more accurate analysis and interpretation of scattering two-phase flow images.

© 2008 Optical Society of America

OCIS Codes
(100.2980) Image processing : Image enhancement
(120.5820) Instrumentation, measurement, and metrology : Scattering measurements
(280.2490) Remote sensing and sensors : Flow diagnostics
(290.4210) Scattering : Multiple scattering

ToC Category:
Remote Sensing and Sensors

Original Manuscript: August 18, 2008
Manuscript Accepted: October 9, 2008
Published: November 19, 2008

E. Kristensson, E. Berrocal, M. Richter, S.-G. Pettersson, and M. Aldén, "High-speed structured planar laser illumination for contrast improvement of two-phase flow images," Opt. Lett. 33, 2752-2754 (2008)

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