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  Laser speckle imaging with an active noise reduction scheme

Voelker, A., Zakharov, P., Weber, B., Buck, A., & Scheffold, F. (2005). Laser speckle imaging with an active noise reduction scheme. Optics Express, 13(24), 9782-9787. doi:10.1364/OPEX.13.009782.

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Voelker, AC, Author
Zakharov, P, Author
Weber, B1, 2, Author              
Buck, A, Author
Scheffold, F, Author
Affiliations:
1Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497798              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794              

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 Abstract: 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.

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 Dates: 2005-11
 Publication Status: Published in print
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 Rev. Type: -
 Identifiers: BibTex Citekey: 3654
DOI: 10.1364/OPEX.13.009782
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Title: Optics Express
  Abbreviation : Opt. Express
Source Genre: Journal
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Publ. Info: Washington, DC : Optical Society of America
Pages: - Volume / Issue: 13 (24) Sequence Number: - Start / End Page: 9782 - 9787 Identifier: ISSN: 1094-4087
CoNE: https://pure.mpg.de/cone/journals/resource/954925609918