BYK haze-gard plus Mode D'emploi page 32

Measurement Principle
A beam strikes the specimen and
enters an integrating sphere
(Fig. 2). The light, uniformly
distributed by the matte white
coating on the sphere wall, is
measured by a detector. Total
transmittance is measured with the
sphere outlet closed, and haze is
measured with the outlet open.
A ring sensor in the outlet opening
measures clarity. The entire
Illumination
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measurement sequence is controlled
automatically.
Specimen
Sphere Entrance
Standards
ASTM D 1003: Standard Test Method
for Haze and Luminous Transmittance
of Transparent Plastics
ASTM D 1044: Standard Test Method
for Resistance of Transparent Plastics
to Surface Abrasion
Detector
Ring Sensor
Sphere Exit
Fig. 2