Reference Tiles

For diffuse reflection measurements, Avantes offers the WS-2 reference tile. For specular reflection measurements, the RS-2 is available.

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 colorimetric application 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 350-1800 nm at circa 98% and from 250-2500 nm at more than 92%. The material offers long term stability, even in UV applications. The plastic is hydrophobic and chemically inert. so it is cleanable.

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 over it.

The special WS-2-GEM is designed to facilitate holding and cooling a gemstone with liquid nitrogen, as it features a cavity and hole in the middle of the tile.

The WS-2-CAL is a NIST traceable calibrated white reference tile which includes an electronic calibration file covering 250-2500 nm.

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 250-2500 nm.

As with most Avantes products, these accessories can be delivered in a custom design. Contact us for more information.

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WS-2 curve

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RS-2 curve

  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 White reference tile
WS-2-GEM White reference tile with hole, specially for Gemstone measurement
WS-2-CAL ?NIST traceable calibrated white reference tile with 8° hemispherical calibration, 250-2500nm
RS-2 Specular Reflectance standard with Al+MgF2, 250-2500 nm
RS-2-CAL NIST traceable calibrated Specular Reflectance standard with Al+MgF2, 250-2500 nm