Abstract

The present study concerns diffuse reflectance spectroscopy of polymer powders and of their binary mixtures with inorganic materials. The total near-normal hemispherical spectral reflectance R of granular materials was measured in the near infrared wavelength range with a dispersive spectrophotometer. The measurement of the reflectance illustrated the influence of different parameters by taking into account (a) the morphology: powders or pellets and (b) the optical property of the material: semi-transparent, opaque or reflecting powders. The statistical treatment of the reflectance data by principal component analysis (PCA) allowed these data to be displayed in a reduced dimensionality space. As a result, the clustering of samples related to their chemical or their physical nature was carried out, giving a simpler description of the data in a new representation. The cross-correlation analysis of the reflectance values allowed similarities between absorption bands to be highlighted.

© 1997 NIR Publications

Terahertz scattering from granular material

Lisa M. Zurk, Brian Orlowski, Dale P. Winebrenner, Eric I. Thorsos, Megan R. Leahy-Hoppa, and L. Michael Hayden
J. Opt. Soc. Am. B 24(9) 2238-2243 (2007)

Simplified model for light scattering from granular materials with varying moisture content

Sara Rosendahl, Johan Casselgren, and Mikael Sjödahl
Appl. Opt. 52(17) 4006-4012 (2013)

Properties of Granularity Wiener Spectra*

Stephen A. Benton and Richard E. Kronauer
J. Opt. Soc. Am. 61(4) 524-529 (1971)

Mechanical analysis and force chain determination in granular materials using digital image correlation

Fanxiu Chen, Qi Zhuang, and Huixin Zhang
Appl. Opt. 55(18) 4776-4783 (2016)

The Relationship Between the Granularity and Graininess of Developed Photographic Materials*

Loyd A. Jones and George C. Higgins
J. Opt. Soc. Am. 35(7) 435-457 (1945)