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Updated: May 10, 2026

Scattering And Absorption of Light in Planetary Regoliths
Published on: July 1, 2019
Simplified model for light scattering from granular materials with varying moisture content.
Sara Rosendahl1, Johan Casselgren, Mikael Sjödahl
1Division of Fluid and Experimental Mechanics, Luleå University of Technology, Luleå, Sweden.
This study introduces a simple two-parameter model to determine water content in sand and glass spheres by analyzing reflection patterns. The model distinguishes between wet (forward reflection) and dry (backward reflection) materials, also indicating sample homogeneity.
Area of Science:
- Geophysics
- Materials Science
- Optical Physics
Background:
- Understanding the optical properties of granular materials is crucial for various applications.
- Characterizing water content in materials like sand affects their physical and optical behavior.
Purpose of the Study:
- To develop a simple model for quantifying water content in sand grains and glass spheres.
- To analyze how water content influences the reflection distribution of these materials.
Main Methods:
- Reflection measurements were conducted on dry and moistened sand grains and glass spheres.
- A novel model combining two sheared cosine-functions was applied to analyze reflection data.
Main Results:
- The proposed model effectively determines water content based on reflection distribution.
- One model parameter indicates water content (high water = forward reflection, dry = backward reflection).
- A second parameter provides insight into the material's homogeneity.
Conclusions:
- The developed model offers a straightforward method for assessing water content in granular materials.
- Reflection patterns serve as a reliable indicator of moisture levels and material uniformity.
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