Figure 2
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(a) Description of different parts of reflection on a surface, (b) comparison of HDR (Hemispherical Directional Reflectivity) and DDR (Diffuse Hemispherical Directional Reflectivity) measurement in an Ulbricht Sphere of cured white and black powder coating and Alanod sheet. HDR and DDR are identical for the two coatings indicating a Lambertian scatter whereas the two are quite different for the high specular Alanod.
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