For diffuse reflection measurements, we offer the WS-2 reference standard, for specular reflection measurements, we offer the RS-2 reference standard.
The WS-2 reference tile is made out of a white diffuse PTFE based material, which is considered the highest grade reference material for diffuse reflectance. It is mostly used in colourimetric applications where a reference signal has to be obtained during a reflection measurement. The PTFE material is high purity and processed using exacting standards to an amorphous structure, so the tile reflects light from 350-1800nm at circa 98% and from 250-2500nm at more than 92%. The material offers long term stability, even in UV applications. The plastic is hydrophobic and chemically inert, allowing it to be cleaned.
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 with the integrating sphere placed over it. A dedicated version for gemstone analysis (WS-2-GEM) is designed with a cavity/hollow to facilitate holding and cooling of the gemstone with liquid nitrogen.
The WS-2-CAL is a NIST traceable calibrated white reference tile which includes an electronic calibration file covering 250-2500nm.
The RS-2 is a mirror tile which can be used as a reference standard for specular reflection measurements. The RS-2-CAL is a calibrated mirror tile which includes a NIST traceable calibration file, which is created using an 8° absolute specular reflectance measurement over the wavelength range from 250-2500nm.
As with most of our products, these accessories can be delivered in a custom design.
WS-2 Reference Tile
WS-2 Reflectance Curve
RS-2 Reflectance Curve