BxDiff project member Jinglin Fu (PTB) won the best student paper award at the 11th Color and Visual Computing Symposium, Sept. 8-9, 2022 in Norway!
The paper reported on the measurement results from PTB in the comparison carried out within BxDiff, together with some simulation results, performed by Jeppe Revall, explaining the wavelength dependence of the samples.
Optical diffusers are used in many application areas related to illumination. With the purpose of characterizing the transmission properties of optical diffusers, we present preliminary results of BTDF (Bidirectional Transmittance Distribution Function) measurement with high angular resolution at two different wavelengths. The expanded total uncertainty of the measurement is estimated to be 0.5% in the best case. In this way, the scattering distribution of optical diffusers could be quantitatively described by their BTDF values with high precision, good repeatability and reproducibility. The diffusers’ angle-dependent spectral transmittances in the VIS (from 380 nm to 780 nm in the electromagnetic spectrum) are also measured using a commercially available spectrophotometer. Results are compared to simulation calculated from a simple model and a first-step explanation for the sample spectral dependency is proposed.