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Optics Letters

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  • Vol. 11, Iss. 7 — Jul. 1, 1986
  • pp: 410–412

Anamorphic optical processing of multiple-exposure speckle photographs

Steven H. Collicott and Lambertus Hesselink  »View Author Affiliations


Optics Letters, Vol. 11, Issue 7, pp. 410-412 (1986)
http://dx.doi.org/10.1364/OL.11.000410


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Abstract

Previous methods for analyzing double-exposed speckle photographs provide point-by-point velocity information by using two-dimensional Fourier analysis, or constant velocity contours by using spatial filtering techniques. A new method using an anamorphic optical system to measure one component of the velocity throughout a section of the flow is analyzed and demonstrated. A laser sheet, thin in the x direction and extended in the y direction, is used to probe a line of the photograph of which the anamorphic optical system forms a one-dimensional Fourier transform in the x direction and images the speckle pattern in the y direction for measuring the x-velocity component. This results in curved fringes, which have a local spacing inversely proportional to the x-velocity component at that point. Thus it is possible to measure a velocity component along a selected line in the flow. This differs from spatial filtering techniques that produce contours showing the points where a selected velocity occurs.

© 1986 Optical Society of America

History
Original Manuscript: March 7, 1986
Manuscript Accepted: April 30, 1986
Published: July 1, 1986

Citation
Steven H. Collicott and Lambertus Hesselink, "Anamorphic optical processing of multiple-exposure speckle photographs," Opt. Lett. 11, 410-412 (1986)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-11-7-410


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References

  1. R. Meynart, Appl. Opt. 22, 4 (1983). [CrossRef]
  2. R. Meynart, Appl. Opt. 19, 9 (1980). [CrossRef]
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  8. R. Meynart, L. M. Lourenco, “Laser speckle velocimetry in fluid dynamic applications,” presented at the von Kármán Institute for Fluid Dynamics Lecture Series 1984–03, Brussels, Belgium, 1984.

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