color measurement for coated glass

color measurement for coated glass

Multiple silver layers on glass panes lend functions to modern building fronts. Thermal insulation or solar control glass is used all over the world to reduce the costs for heating or cooling. Until now, a d:8° measuring instrument with gloss (SPCI) has been used in the laboratory to measure glass panes. Since the surface of the glass panes does not scatter, and only the low illumination from the glossy angle at -8° provides useful illumination, all other illumination angles are ineffective. Xrite has developed a measurement geometry under which the glass sheet is illuminated at a certain angle and the measurement takes place exactly on the other side, directly in the gloss. The non-contact measurement makes it possible to measure panes of different thickness

without having to mechanically adjust the measuring head.

X-Rite offers two measurement geometries:

 

Version ERX54

The glass is illuminated at +15° and measured at -15°. This measurement provides the same results as in the laboratory with a sphere geometry measurement (d:8°, SPCI). With 2 instruments not only the reflection from both sides of the glass can be measured but also the transmission.
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Version ERX56

This instrument offers three measuring geometries: +15°:-15°, -45°:+45° and +60°:-60°. The 15° measurement provides the same measurement results as in the laboratory with a ball geometry measurement (d:8°, SPCI). The 45° and 60° measurement provides important information about colour changes at different angles.
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