Abstract
The increase in the bidirectional reflectance distribution function around the retro-reflection direction was characterized for four common diffuse standard reflectance materials: Spectralon, matte white Russian opal glass, matte white ceramic standard and pressed barium sulphate (BaSO4) powder. The characterized increase or surge is high enough to be considered in low-uncertainty reflectance factor measurements, where the values are usually extrapolated around that direction due to instrumental limitations. In order to make the corrections for this surge, the coherent backscattering of light model and a much simpler exponential function were fitted to the measurements.
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