Interactive Resource icon  Effect of Surface Roughness on Reflectivity

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Resource type: Interactive Resource
Description: The spatial distribution of the reflected light is what causes the aluminium surface to appear glossy or dull, and it is directly associated to the surface roughness.This interactive animation shows how the surface roughness (represented by Ra) affects the scattering of light. To see it select different values of Ra by clicking on the buttons; and use the drop-down menu to change the y-axes scaling. For very smooth surfaces the reflected light is concentrated around the specular angle of reflectance, and the surface will appear glossy and mirror-like. As the roughness increases, reflections become increasingly diffuse, and the surface appears matt/dull.
Keywords: roughness • reflectivity • optical • scattering of light
Categories: Materials > Metals & alloys > Aluminium & alloys
Processes > Surface treatments
Properties > Electrical, magnetic & optical > Optical
Created by: MATTER, The University of Liverpool
Iris De Graeve, Vrije Universiteit Brussel (VUB)
Herman Terryn, Vrije Universiteit Brussel (VUB)
Contributions: Marc Ryckeboer, Sapa
Christophe Sigli, Alcan Centre de Recherches de Voreppe
Hugh Shercliff, University of Cambridge
Published by: European Aluminium Association, Brussels
License: This resource is released under the Creative Commons Attribution Non-Commercial No Derivatives license (2.0 UK: England & Wales).
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Date created: 21 July 2005
Date added: 21 December 2009
Resource ID: 2602