Comparison of NRC goniometric and integrating sphere methods for realizing an absolute diffuse reflectance scale

Réjean Baribeau; Joanne Zwinkels

doi:10.1117/12.930794

15 October 2012 Comparison of NRC goniometric and integrating sphere methods for realizing an absolute diffuse reflectance scale

Réjean Baribeau, Joanne Zwinkels

Author Affiliations +

Proceedings Volume 8495, Reflection, Scattering, and Diffraction from Surfaces III; 84950A (2012) https://doi.org/10.1117/12.930794
Event: SPIE Optical Engineering + Applications, 2012, San Diego, California, United States

Abstract

At the National Research Council of Canada (NRC), the scale of diffuse spectral reflectance in the UV and visible range is realized using an integrating sphere method known as the Modified Sharp-Little method and has been wellcharacterized and validated. More recently, a gonioreflectometer has been designed to capture the bidirectional reflectance of reflecting objects. This system incorporates a diode-array spectroradiometer and is prone to non-linearity errors. In this paper the magnitude of this non-linearity error is evaluated using several diffusely reflecting materials by comparing the angular-integrated reflection indicatrix measured with the gonioreflectometer with results obtained using a transfer spectrophotometer that is traceable to the sphere-based NRC Absolute Reflectometer.

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Réjean Baribeau and Joanne Zwinkels "Comparison of NRC goniometric and integrating sphere methods for realizing an absolute diffuse reflectance scale", Proc. SPIE 8495, Reflection, Scattering, and Diffraction from Surfaces III, 84950A (15 October 2012); https://doi.org/10.1117/12.930794

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