For reflection measurements reference tiles can be used, for diffuse reflection the WS-2 is the recommended reference tile. For specular reflection the RS-2 is the best choice.
The WS-2 white reference tile is made out of a white diffuse PTFE based material, meeting the highest demands with regard to high grade diffuse reflectance. The WS-2 is mostly used in colorimetric applications where a reference signal has to be obtained during a reflection measurement.
Thanks to most accurate preparation of the PTFE and its processing to an amorphous structure, the tile reflects light from 350-1800 nm with ca 98% and from 250-2500 nm more than 92%. The material offers long term stability, even in UV applications. The plastic is hydrophobic and chemically inert.
Specially for gemology applications the WS-2 is used in combination with a reflection integrating sphere. The gemstone is put on the middle of the tile, the integrating sphere over it. A special WS-2 tile (WS-2-GEM) is developed to be able to cool the gemstones with liquid nitrate, therefore a hole is designed in the middle of the tile. The material can be delivered as custom designed items, contact us for more information.
The RS-2-CAL is the calibrated tile with 8° absolute specular reflectance values for 250-1100nm wavelength range. Technical Data
WS-2
RS-2
Material
Diffuse PTFE material
BK7 with Al+MgF2 coating
Max. temperature
280 °C
80°C
Dimensions tile
32 mm diameter / 10 mm thick
32 mm diameter / 1 mm thick
Housing
38 mm diameter, black PVC, cover red anodized
WS-2 curve
Ordering Information
WS-2
White reference tile
WS-2-GEM
White reference tile with hole, specially for Gemstone measurement
RS-2
Specular reflectance standard with Al+MgF2, 200-1100nm
RS-2-CAL
NIST traceable calibrated Specular reflectance standard with Al+MgF2, 250-1100nm
