2 | System Description BYK-Gardner GmbH
18 spectro2guide Family 295 024 855 E 2405
2.4 Measurement Principle
The instrument is available with two different measurement geometries.
2.4.1 Geometry 45°c:0°
The 45°c:0° geometry uses 45° circumferential illumination and 0° viewing perpendicular to the
sample plane. The circumferential illumination is essential to achieve repeatable measurement
results on directional and structured surfaces
The 45/0 geometry simulates the normal condition used for color evaluation. For example, when
we read a glossy magazine we position it to avoid the gloss from coming into our eye. A high
gloss sample with the same pigmentation is visually judged darker by the eye when compared
to a matte or structured sample.
2.4.2 Geometry d:8°
A sphere geometry illuminates the sample diffusely by means of a white coated integration
sphere. Baffles prevent the light from directly illuminating the sample surface. Measurement is
done using an 8° view angle.
A sphere instrument may be operated under two different measurement conditions: specular
included (spin) or specular excluded (spex). In the “spin” mode, the total reflected light is
measured. In the “spex” mode, a gloss trap is used to capture the directly reflected light (gloss).
Color is measured independent of the sample’s gloss or surface texture.
To Next Page
Loading...
