Optics: measuring and testing – For size of particles – By particle light scattering
Patent
1992-04-30
1993-09-28
Rosenberger, Richard A.
Optics: measuring and testing
For size of particles
By particle light scattering
356338, 356237, 356445, G01N 1502
Patent
active
052490297
ABSTRACT:
The apparatus is based on a standard grindometer block comprising a longitudinally extending sample channel of steadily increasing depth which is filled with the paint to be investigated and then stripped and smoothed with a doctor blade. Instead of being visually evaluated, the paint surface is subjected to automatic objective evaluation in an optoelectronic apparatus comprising a light source with a focussing lens for producing a light spot on the paint surface to be investigated, a dark-field lens comprising an objective for picking up the scattered light emanating from pigment particles in the vicinity of the light spot and an aperture diaphragm for eliminating the light directly reflected at the paint surface, a photoreceiver connected to an evaluation circuit for detecting, recording and further processing the scattered light signals and a scanner for longitudinally scanning the sample channel.
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Botzen Manfred
Riesebeck Detlef
Sommer Klaus
Thiemann Jurgen
Bayer Aktiengesellschaft
Pham Hoa Q.
Rosenberger Richard A.
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