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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 9 — Mar. 20, 2012
  • pp: 1396–1406

Spatial filtering velocimetry of objective speckles for measuring out-of-plane motion

M. L. Jakobsen, H. T. Yura, and S. G. Hanson  »View Author Affiliations

Applied Optics, Vol. 51, Issue 9, pp. 1396-1406 (2012)

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This paper analyzes the dynamics of objective laser speckles as the distance between the object and the observation plane continuously changes. With the purpose of applying optical spatial filtering velocimetry to the speckle dynamics, in order to measure out-of-plane motion in real time, a rotational symmetric spatial filter is designed. The spatial filter converts the speckle dynamics into a photocurrent with a quasi-sinusoidal response to the out-of-plane motion. The spatial filter is here emulated with a CCD camera, and is tested on speckles arising from a real application. The analysis discusses the selectivity of the spatial filter, the nonlinear response between speckle motion and observation distance, and the influence of the distance-dependent speckle size. Experiments with the emulated filters illustrate performance and potential applications of the technology.

© 2012 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
(070.6110) Fourier optics and signal processing : Spatial filtering
(120.7250) Instrumentation, measurement, and metrology : Velocimetry

ToC Category:
Coherence and Statistical Optics

Original Manuscript: August 29, 2011
Revised Manuscript: November 10, 2011
Manuscript Accepted: November 10, 2011
Published: March 19, 2012

M. L. Jakobsen, H. T. Yura, and S. G. Hanson, "Spatial filtering velocimetry of objective speckles for measuring out-of-plane motion," Appl. Opt. 51, 1396-1406 (2012)

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