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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 47, Iss. 20 — Jul. 10, 2008
  • pp: 3674–3680

Speckle dynamics for intensity-modulated illumination

Michael L. Jakobsen and Steen G. Hanson  »View Author Affiliations


Applied Optics, Vol. 47, Issue 20, pp. 3674-3680 (2008)
http://dx.doi.org/10.1364/AO.47.003674


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Abstract

We analyze the dynamics of laser speckle patterns, designed for sensing with a receiver, based on spatial filtering. The speckle translation arises after free-space propagation of light scattered from nonspecular surfaces of a solid object in motion. The speckle pattern is manipulated by modulating the intensity of the coherent light, illuminating the target. The space–time normalized cross covariance of speckle patterns incident on the spatial sensor is calculated for the field distribution of three Gaussian beams having arbitrary directions and separations when incident on the target. The modulation of the intensity distribution at the target introduce a higher spatial frequency component in the speckle pattern. The theoretical analysis provides the statistical parameters for both the speckles and the higher spatial frequency component. The analysis reveals that the speckles and the higher spatial frequency component do not necessarily translate as a rigid structure. The theoretical findings are supported by measurements.

© 2008 Optical Society of America

OCIS Codes
(030.1640) Coherence and statistical optics : Coherence
(030.1670) Coherence and statistical optics : Coherent optical effects
(030.6140) Coherence and statistical optics : Speckle
(030.6600) Coherence and statistical optics : Statistical optics
(120.7250) Instrumentation, measurement, and metrology : Velocimetry

ToC Category:
Coherence and Statistical Optics

History
Original Manuscript: October 10, 2007
Revised Manuscript: May 30, 2008
Manuscript Accepted: June 16, 2008
Published: July 9, 2008

Citation
Michael L. Jakobsen and Steen G. Hanson, "Speckle dynamics for intensity-modulated illumination," Appl. Opt. 47, 3674-3680 (2008)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-47-20-3674


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References

  1. Y. Aizu and T. Asakura, Spatial Filtering Velocitmetry: Fundamentals and Applications (Springer-Verlag, 2006).
  2. U. Schnell, J. Piot, and R. Dändliker, “Detection of motion with laser speckle patterns: statistical properties,” J. Opt. Soc. Am. A 15, 207-216 (1998). [CrossRef]
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