Soot scattering measurements in the visible and near-infrared spectrum

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Scattering to extinction cross-section ratios, {rho}{sub se} were measured using the NIST Large Agglomerate Optics Facility for soot produced from ethene and acetylene laminar diffusion flames. Measurements were performed using light sources at 543.5 nm, 632.8 nm and 856 nm. The average scattering to extinction cross-section ratios for these wavelengths are equal to 0.246, 0.196, and 0.196 for ethene and 0.316, 0.230, and 0.239 for acetylene. The 856 nm measurements represent the longest wavelength for which accurate scattering measurements have been performed for soot. The size distribution and fractal properties of the two soots were determined to assess the effects ... continued below

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26 p.

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ZHU,JINYU; CHOI,MUN YOUNG; MULHOLLAND,GEORGE W. & GRITZO,LOUIS A. February 8, 2000.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM, and Livermore, CA (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

Scattering to extinction cross-section ratios, {rho}{sub se} were measured using the NIST Large Agglomerate Optics Facility for soot produced from ethene and acetylene laminar diffusion flames. Measurements were performed using light sources at 543.5 nm, 632.8 nm and 856 nm. The average scattering to extinction cross-section ratios for these wavelengths are equal to 0.246, 0.196, and 0.196 for ethene and 0.316, 0.230, and 0.239 for acetylene. The 856 nm measurements represent the longest wavelength for which accurate scattering measurements have been performed for soot. The size distribution and fractal properties of the two soots were determined to assess the effects of limited acceptance angle range, finite size of the sensor, and departure from cosine response on the uncertainty in the measurement of {rho}{sub se} The expanded relative uncertainty (95% confidence level) was found to be {+-}6% at the two visible wavelengths and {+-}8% at 856 nm. Both the magnitude and wavelength dependence of {rho}{sub se} for the present experiments are significantly different from those reported by Krishnan et al. for overfire soot produced using a turbulent flame. The results are compared with the predictions of fractal optics.

Physical Description

26 p.

Notes

OSTI as DE00751184

Medium: P; Size: 26 pages

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  • 28th International Combustion Symposium, Edinborough, Scotland (GB), 07/30/2000--08/04/2000

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  • Report No.: SAND2000-0371C
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 751184
  • Archival Resource Key: ark:/67531/metadc706076

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • February 8, 2000

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 10, 2017, 6:31 p.m.

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ZHU,JINYU; CHOI,MUN YOUNG; MULHOLLAND,GEORGE W. & GRITZO,LOUIS A. Soot scattering measurements in the visible and near-infrared spectrum, article, February 8, 2000; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc706076/: accessed November 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.