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Optical properties (bidirectional reflectance distribution function) of shot fabric.

R Lu, J J Koenderink, A M Kappers

    Applied Optics
    |March 21, 2008
    PubMed
    Summary

    Researchers developed a new method to measure bidirectional reflectance distribution function (BRDF) samples for studying material optical properties. This technique, applied to shot fabrics, reveals color changes are mainly due to occlusion effects.

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    Area of Science:

    • Optics
    • Materials Science
    • Textile Engineering

    Background:

    • Accurate characterization of material optical properties requires comprehensive angular distribution functions of surface scattering.
    • Existing methods for collecting bidirectional reflectance distribution function (BRDF) samples can be cumbersome.

    Purpose of the Study:

    • To present a convenient and efficient method for collecting a large set of BRDF samples.
    • To investigate the optical properties and color-changing characteristics of shot fabrics.

    Main Methods:

    • Material samples were wrapped around a right-circular cylinder and illuminated by a parallel light source.
    • Scattered radiance was captured using a digital camera while the cylinder was tilted to collect samples outside the plane of incidence.
    • The method accommodates both isotropic and anisotropic scattering materials.

    Main Results:

    • The developed method successfully collected extensive BRDF samples for shot fabrics.
    • Color-changing properties of shot fabrics were linked to their physical and geometrical structure.
    • The primary cause for the observed color changes in shot fabrics was identified as an occlusion effect.

    Conclusions:

    • The proposed BRDF measurement technique is effective for characterizing complex scattering phenomena.
    • Understanding occlusion effects is crucial for explaining the angular color variations in textiles like shot fabrics.
    • This method provides valuable data for applications requiring precise optical property simulation of materials.