Apparatus and method for measuring particle contamination

Details Apparatus and method for measuring particle contamination Apparatus and method for measuring particle contamination

1992-12-23

1994-12-13

McGraw, Vincent P.

Optics: measuring and testing

By monitoring of webs or thread

For flaws or imperfections

356429, 356431, G01N 2184

Patent

active

053733657

ABSTRACT:
An apparatus, and a method for its use, for measuring particulate contamination on a web (10) in a web-cleaning system having means for contacting and removing particles from the web (12). The means for contacting and removing particles has a particle-collecting surface (14). A light source (16) is positioned to direct a light beam against the particle-collecting surface. A sensor (18) senses the intensity of light reflected from the particle collecting surface and generates a signal R.sub.0 representative of the initial reflected light intensity prior to particle collection by the particle collecting surface and a signal R.sub.f representative of the reflected light intensity after particle collection by the particle collecting surface, the difference between R.sub.0 and R.sub.f being a measure of the particulate contamination level on the web.

REFERENCES:
patent: 3588513 (1971-06-01), Takatsuki et al.
patent: 4019066 (1977-04-01), Lucas et al.
patent: 4053237 (1977-10-01), Casey
patent: 4237539 (1980-12-01), Piovoso et al.

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