Speckle reduction in the small-angle light scattering technique using sample vibration

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Abstract

Experimental patterns obtained using the small-angle light scattering technique for thin-film polymer studies are fraught with speckles arising from the effect of interspherulitic interference. The presence of speckles hampers efforts in characterizing the spherulitic structure. Using a divergent beam increases the number of scattering sites and results in a reduction of the degree of speckling. Nevertheless, this decimates the ability of analyzing the pattern at low-scattering angles. Employing an expanded collimated beam produces the same effect but necessitates the use of specially designed optical components. This article outlines a novel technique that involves simple vibration of the polymer sample. Experimental results confirm its efficacy in reducing speckles without limiting the ability for analysis at low-scattering angles.

Original languageEnglish
Pages (from-to)937-943
Number of pages7
JournalJournal of Polymer Science, Part B: Polymer Physics
Volume35
Issue number6
DOIs
Publication statusPublished - 30 Apr 1997
Externally publishedYes

Keywords

  • Characterization
  • Small-angle light scattering
  • Speckle
  • Vibration

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