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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 13, Iss. 24 — Nov. 28, 2005
  • pp: 9782–9787

Laser speckle imaging with an active noise reduction scheme

A.C. Völker, P. Zakharov, B. Weber, F. Buck, and F. Scheffold  »View Author Affiliations

Optics Express, Vol. 13, Issue 24, pp. 9782-9787 (2005)

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We present an optical scheme to actively suppress statistical noise in Laser Speckle Imaging (LSI). This is achieved by illuminating the object surface through a diffuser. Slow rotation of the diffuser leads to statistically independent surface speckles on time scales that can be selected by the rotation speed. Active suppression of statistical noise is achieved by accumulating data over time. We present experimental data on speckle contrast and noise for a dynamically homogenous and a heterogeneous object made from Teflon. We show experimentally that for our scheme spatial and temporal averaging provide the same statistical weight to reduce the noise in LSI: The standard deviation of the speckle contrast value scales with the effective number N of independent speckle as 1/√N.

© 2005 Optical Society of America

OCIS Codes
(110.4280) Imaging systems : Noise in imaging systems
(110.6150) Imaging systems : Speckle imaging
(170.3880) Medical optics and biotechnology : Medical and biological imaging
(170.7050) Medical optics and biotechnology : Turbid media

ToC Category:
Research Papers

Original Manuscript: September 30, 2005
Revised Manuscript: September 29, 2005
Published: November 28, 2005

A. Völker, P. Zakharov, B. Weber, F. Buck, and F. Scheffold, "Laser speckle imaging with an active noise reduction scheme," Opt. Express 13, 9782-9787 (2005)

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