Encyclopedia of Color Science and Technology

Living Edition
| Editors: Ronnier Luo

Standard Measurement Geometries

Living reference work entry
DOI: https://doi.org/10.1007/978-3-642-27851-8_361-1

Synonyms

Definition

Reflectance and transmittance measurements are partly dependent upon the geometry of illumination and viewing. Accordingly, the International Commission on Illumination (CIE) has specified illuminating and viewing conditions, namely, 45°:0°a, 45°:0°c, 45°:0°x, 0°:45°, d:0°, 0°:d, de:8°, and di:8°. With the 45°:0° geometry, the sample is illuminated at an angle of 45° from the normal to the sample surface and viewed normal to the sample surface or within 10° of the normal. There are three standard configurations of the geometry: 45°:0°a, 45°:0°c, and 45°:0°x. The 45°:0°a has a 10° wide cone of light incident on the sample at 45° to the sample normal. The “a” in 45°:0°a indicated “annular,” meaning that the 10° cone continues uninterrupted all the way around the sample. 45°:0°c indicates circumferential illumination, which is similar to annular except that it is distributed in discrete locations around the ring. 45°:0°x...

Keywords

Inclination Angle Specular Reflection Device Under Test Measurement Geometry Luminous Flux 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.Department of Mechanical and Mechatronic EngineeringNational Taiwan Ocean UniversityKeelungTaiwan