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Workshop
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Research
GDR APPAMAT - WORKSHOP: High-precision BRDF Measurement
Du 09 December 2021 au 10 December 2021 à 00:00
Campus de Saint Etienne
The GDR APPAMAT, the European consortium BxDiff bringing together metrology centres and companies involved in BRDF measurement, and the Institut d'Optique Graduate School join forces for a two-day workshop on BRDF metrology.
New requirements in terms of product appearance characterization, regarding gloss in particular, generate a growing demand in and a varied offer of measurement devices. This rapid evolution reinforces the need to develop reference tools and high precision primary metrology, including precise measurand definitions, primary standards, and high-precision instruments. Most recent progresses in this domain, and same related problems that arise, are the subject of this two-day winter school co-organized by the european consortium BxDiff, founded by Euramet and gathering several metrological institutes and companies from Europe, GDR Appamat, and the Institut d’Optique Graduate School.
DAY 1 – STATE OF THE ART: OPTICAL METROLOGY FOR APPEARANCE
9 december 2021 – Room L125
On the occasion of this winter school, the course day organized by the Institut d’Optique for students of the Advanced Imaging and Material Appearance (AIMA) master is open to all participants. The lessons will be given by Gael Obein from the LNE-CNAM laboratory, also leader of the BxDiff consortium, and other researcher of the consortium.
9:30 – 12:00 – Session 1
- Gael Obein (LNE-CLAM) | Appearance and BRDF metrology
14:00 – 17:00 – Session 2
- Alejandro Ferrero (CSIC, Spain) | BSSRDF
- Nina Basic (METAS, Switzerland) | Sparkle
- Lou Gevaux (LNE-CNAM) | PSF and translucency
- Gael Obein (LNE-CNAM) | Gloss metrology
DAY 2 – RESEARCH IN PROGRESS: SPECKLE EFFECT IN HIGH RESOLUTION BRDF MEASUREMENT
10 December 2021 – Room L106
9:30 – Gael Obein (LNE-CLAM) | Evolution of BRDF measurement: when the speckle effect arose
10:00 – Pierre Chavel (Institut d’Optique Graduate School) | The speckle theory (1) : an introduction
10:45 – Pierre Chavel | The speckle theory (2) : advanced modelling
11:30 – Mathieu Hébert (Institut d’Optique Graduate School and University Saint-Etienne) | Educational demo with optical bench
14:30 – Thomas Labardens (LNE-CNAM) | Speckle effect in high resolution BRDF measurements with ConDOR
15:00 – Loic Denis (University of Saint-Etienne) | Removing speckle while maintaining resolution : methods in radar imaging.
15:30 – Myriam Zerrad (Institut Fresnel) | Preventing or using speckle in BRDF measurements
16:00 – Discussion : is the BRDF of a surface the expectation of the signal measured?