BSDF: Bidirectional Scattering Distribution Function
The BSDF setup allows the spectral measurement of the angular reflection and transmission pattern of a material under different irradiation geometries.
The setup consists of two parts: the irradiation section and the detection section. The irradiation section consists of a Xe lamp (250 W). Using a collimating mirror, a parallel beam is created, which is directed towards the sample. A filter wheel with neutral density filters can be inserted in the path of light to enhance the dynamic range of the setup. The sample is positioned in a sample holder, which allows rotation around two axes (vertical and horizontal). This allows the selection on any incident direction of the beam on the sample. The detection part consists of a bench which can be rotated (using stepper motors) around two axes. This allows the selection of any viewing angle. A detector is positioned at the end of the bench, which is connected to a spectrometer with CCD with an optical fiber.
- Xe light source (250 W)
- Filter wheel with 3 neutral density filters, dynamic range > 6 decades
- Full 3D range (reflection and transmission)
- Angular resolution: 1.8°
- Spectrometer with CCD: spectral measurements
- Wavelength range VIS CCD: 360-800 nm
- Wavelength range NIR CCD: 800-1300 nm
- Spectral bandwidth: 3.5 nm