ALTANA Haze-Gard Plus Operating Instructions - Manual (Page 32)

Fig. 2
Illumination
Detector
Sphere Exit
Ring Sensor
Specimen
Sphere Entrance
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
measurement sequence is controlled
automatically. 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