Evidence for the need to update the definition of the BRDF - spectral considerations

Pierre Chavel; Thomas Labardens; Mathieu Hébert; Lionel Simonot; Yvan Sortais; Gaël Obein

doi:10.1117/12.2616107

20 December 2021 Evidence for the need to update the definition of the BRDF - spectral considerations

Pierre Chavel, Thomas Labardens, Mathieu Hébert, Lionel Simonot, Yvan Sortais, Gaël Obein

Proceedings Volume 12126, Fifteenth International Conference on Correlation Optics; 121261T (2021) https://doi.org/10.1117/12.2616107
Event: Fifteenth International Conference on Correlation Optics, 2021, Chernivtsi, Ukraine

Abstract

In this presentation, we discuss the implications of increasing requirements on angular resolution in measuring the BRDF, the Bidirectional Reflection Diffusion Function, in particular for the control of manufactured artefacts. To account for fast angular variations with respect to the direction of illumination or to the direction of observation, coherence requirements increase, and speckle appears. However, speckle should not be considered as part of the BRDF. Means to adjust the definition of the BRDF and to circumvent the effect of speckle include an analysis of spatial and temporal coherence in the characterization instruments. In particular, the effects of spectral width on the speckle features in scattering diagrams are discussed qualitatively.

Citation Download Citation

Pierre Chavel, Thomas Labardens, Mathieu Hébert, Lionel Simonot, Yvan Sortais, and Gaël Obein "Evidence for the need to update the definition of the BRDF - spectral considerations", Proc. SPIE 12126, Fifteenth International Conference on Correlation Optics, 121261T (20 December 2021); https://doi.org/10.1117/12.2616107

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KEYWORDS

Bidirectional reflectance transmission function

Speckle

Scattering

Signal to noise ratio

Solids

Spatial frequencies

Sensors

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