The effect of particle aspect ratio on spatially and angularly resolved vis-NIR spectroscopy of suspensions

Daria Stoliarskaia, Kelly Thomson, Leo Lue, Yi-Chieh Chen

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

2 Citations (Scopus)
37 Downloads (Pure)


The particle characteristics in a suspension affect the performance and quality of the end product of many chemical industries. The shape of the suspended particles can be influenced by changes in the manufacturing process conditions. Thus, there is a need for a robust method for continuous monitoring of particle characteristics through the process. This study investigates the feasibility of using spatially and angularly resolved diffuse reflectance measurements as a method of determining particle shape. A forward calculation was developed using the discrete dipole approximation to estimate optical properties of the single particle and the diffuse approximation for the reflectance of the particle suspension. The method was used to study aqueous suspensions of randomly-oriented polystyrene ellipsoids. Our objectives were to determine and elucidate the contribution of aspect ratio on optical measurement in vis-NIR spectra. The results suggest that the method is suitable for determining particle shape for suspensions where the particle and the solvent have significantly different optical properties. For these systems, the study suggests that diffusion reflectance measurements can be developed into an in-line method for particle shape determination
Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsPietro Ferraro, Simonetta Grilli, Monika Ritsch-Marte, Christoph K. Hitzenberger
Place of PublicationBellingham, Washington
Number of pages7
ISBN (Electronic)9781510627994
Publication statusPublished - 25 Jul 2019


  • diffuse reflectance
  • diffuse approximation
  • aspect ratio


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