An Innovative Approach to Exploit the Reflection Spectroscopy of Liquid Characteristics

Ran Pelta*, Amihai Granot, Eyal Ben-Dor

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Reflection spectroscopy, in the visible–near-infrared–shortwave infrared region (Vis-NIR-SWIR, 350–2500 nm), is a useful technology to extract chemical and physical properties of materials, but might be useless in identifying the spectral features of transparent or dark opaque liquids. Low reflectance values of a liquid reduce the ability to identify characteristic absorption features at specific wavelengths in the reflectance spectrum. In this study, we present a rapid and easy-to-use method to increase the measured reflectance spectrum and expose characteristic absorption features of a liquid. This was done by mixing the liquid with a white enhanced substance (WES). For this purpose, we used aluminum oxide (Al2O3) powder—a very bright (high albedo) substance and featureless across the entire Vis-NIR-SWIR region. The reflectance spectrum of the mixture—liquid and WES—was measured using a spectroradiometer. This procedure enabled to identify characteristic spectral features of the liquids that would have not been observed in the reflectance spectrum measured from the liquid alone.

Original languageEnglish
Pages (from-to)643-646
Number of pages4
JournalApplied Spectroscopy
Issue number4
StatePublished - 1 Apr 2018


  • Liquids spectroscopy
  • Vis-NIR-SWIR
  • reflectance measurements
  • reflection spectroscopy
  • spectroradiometer
  • visible–near-infrared–shortwave infrared region
  • white reflectance


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