Report on multiscale traceability of BRDF measurement

To establish a multi-scale traceability between small measurement areas and classic measurement areas we have developed a new goniospectrophotometer which can measure the BRDF in micron scale. As we have described in our previous deliverable that the knowledge about optical properties at a micrometric scale of materials is important to understand and reproduce the appearance of the full object. So, to prove the difference of measurement in micron scale we will perform a comparative study by measuring BRDF with illumination beam of different scale like: 100micron,1mm and 1cm. And to validate our measurement we will develop new model of our customized sample. In further this procedure can be applied to natural (wood, leather, fabric etc.) and 3D printed materials.