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Paint and Coatings Industry Standards
ISO 10216:2010 Anodized aluminium and aluminium alloys -- Instrumental determination of image clarity of anodic oxidation coatings -- Instrumental method
The method is based on light coming through a first slit (light source), being converted to parallel light through a first lens (collimator), reflected at the surface of the test piece, focussed at a combed sliding shutter through a second lens (condensing lens). The signal measured by a photo-receiver behind the shutter is a measure of image clarity.