Reflectance Standards
NPL can provide and has helped to develop a range of different reflectance standards.
There are a variety of samples available:
Ceramic tiles
100 mm square or 50 mm square, glossy or matt finish.
|
Ceramic Colour Standards Set |
12 tiles - 3 neutral grey, 7 coloured (deep pink, red, orange, yellow, green, cyan, deep blue) and 2 colour difference (grey and green) |
| Neutral tiles | White, black and grey |
| Metameric colour difference tiles | A pair of ceramic tiles designed to appear similar in colour in daylight (D65), but different under tungsten lighting (Illuminant A) |
| Low thermochromism tiles | These tiles are less prone to changes in colour with temperature than normal coloured tiles (however, they are also less saturated) |
| Holmium tile | The reflectance curve of this reflective wavelength standard contains a number of absorption peaks, which can be used for wavelength and bandwidth investigations. The tiles also give striking colour changes between some light sources. |
Other reflectance standards
|
White Russian Opal |
Unlike the colour-glazed ceramic tiles, this standard is flat polished pot opal 50 mm square. It gives a higher reflectance in the visible part of the spectrum than the ceramic white tile and can also be used in the UV. |
| PTFE reflectance standards such as Spectralon® | White, a range of neutral grey values and black standards are available. These standards are typically 50 mm diameter and have a matt finish. They have a flatter reflectance profile in the UV and near-infrared. |
| Front surface mirrors | 50 mm square, silicon dioxide over-coated aluminium front surface mirror. The coating protects the aluminium from degrading and can be cleaned with care. Can be used from 200 nm to 2500 nm. |
Contact
Customer Service tel: +44 20 8943 6151
E-mail: optical_enquiries@npl.co.uk
Last Updated: 25 Mar 2010
Created: 6 Aug 2009