Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet
Patent
1998-02-25
1999-10-12
Le, Que T.
Radiant energy
Photocells; circuits and apparatus
With circuit for evaluating a web, strand, strip, or sheet
25055922, 3562372, G01N 2186
Patent
active
059658967
ABSTRACT:
Methods and apparatus are provided for generating scratch wear resistance information on a given specimen 13 by measuring off-specular light scattering. The technique employs a focused light beam 10 that illuminates the area of the specimen surface which is scratched or otherwise altered by a stylus 5 pressed to this surface with a determined force (load). The stylus is slid along this surface with a determined speed and for a determined distance. In a preferred embodiment, the specimen is mounted on a turntable 4, and the stylus and the optical elements are stationary. The light scattering intensity is measured using a light detector 7 continuously or quasi-continuously and data is evaluated using a computer 9.
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Bushman Browning
Le Que T.
Marton & Associates, Inc.
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