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Optics Express

Optics Express

  • Editor: J. H. Eberly
  • Vol. 6, Iss. 11 — May. 22, 2000
  • pp: 202–212

Transparency effects on powder speckle decorrelation

David. L. Death, John. E. Eberhardt, and Craig. A. Rogers  »View Author Affiliations

Optics Express, Vol. 6, Issue 11, pp. 202-212 (2000)

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Laser speckle decorrelation has previously been applied to measure the mean powder size of bulk powder beds and the roughness of porous rocks. The angular decorrelation rate of laser speckle from bulk powder beds correlates strongly with the mean powder size. However it was found that the angular decorrelation rates of transparent powders were much higher than those of opaque or dyed powders of the same size distribution. The accuracy of size measurements could be severely compromised if transparency effects were not compensated. Monte Carlo modelling of remitted photon path lengths in a powder bed suggests and experimental data supports that diffuse reflectance data may be used to correct for transparency effects on angular decorrelation rate data.

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OCIS Codes
(030.6140) Coherence and statistical optics : Speckle
(120.5820) Instrumentation, measurement, and metrology : Scattering measurements
(120.6150) Instrumentation, measurement, and metrology : Speckle imaging
(290.5850) Scattering : Scattering, particles
(350.4990) Other areas of optics : Particles

ToC Category:
Research Papers

Original Manuscript: April 17, 2000
Published: May 22, 2000

David Death, John Eberhardt, and Craig Rogers, "Transparency effects on powder speckle decorrelation," Opt. Express 6, 202-212 (2000)

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