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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 46, Iss. 5 — Feb. 10, 2007
  • pp: 725–729

Bright versus dark schlieren imaging: quantitative analysis of quasi-sinusoidal phase objects

Ismael Núñez and José A. Ferrari  »View Author Affiliations

Applied Optics, Vol. 46, Issue 5, pp. 725-729 (2007)

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We discuss the schlieren imaging of quasi-sinusoidal phase objects. We demonstrate that, when the zero-order (Fourier) spatial component of the input image is not blocked by the schlieren-knife at the Fourier plane, the intensity distribution on the reconstructed image is a linear function of the phase amplitude. In contrast, if the zero order is completely blocked (i.e., dark Schlieren processing), the intensity distribution on the output image becomes essentially a quadratic function of the phase, and thus a direct phase retrieval is not possible. We discuss the possibility of contrast enhancement and present validation experiments.

© 2007 Optical Society of America

OCIS Codes
(070.2580) Fourier optics and signal processing : Paraxial wave optics
(070.6110) Fourier optics and signal processing : Spatial filtering
(100.5070) Image processing : Phase retrieval

ToC Category:
Fourier Optics and Optical Signal Processing

Original Manuscript: July 17, 2006
Revised Manuscript: October 12, 2006
Manuscript Accepted: October 20, 2006
Published: January 25, 2007

Ismael Núñez and José A. Ferrari, "Bright versus dark schlieren imaging: quantitative analysis of quasi-sinusoidal phase objects," Appl. Opt. 46, 725-729 (2007)

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