Optics: measuring and testing – By configuration comparison – With photosensitive film or plate
Patent
1992-02-27
1993-11-23
Evans, F. L.
Optics: measuring and testing
By configuration comparison
With photosensitive film or plate
356244, 356434, 356440, 250341, 250576, G01B 1106
Patent
active
052649172
ABSTRACT:
Method and apparatus for monitoring film formers in an opaque process stream by immersing a segment of a transparent eccentrically mounted rotatable disc in the fluid stream, allowing time to accumulate film formers, then rotating the disc to expose the previously immersed section to optical monitoring by which a sample transmittance may be compared to a reference transmittance; the disc may have a segment presenting a hydrophilic surface and another segment presenting a hydrophobic surface so that different kinds of film formers may be monitored.
REFERENCES:
patent: 2489286 (1949-11-01), Grant, Jr.
patent: 2562901 (1951-08-01), Fischer
patent: 2898803 (1959-08-01), Morrison
patent: 4135100 (1979-01-01), Harada et al.
patent: 4916317 (1990-04-01), Gabriel et al.
patent: 4941742 (1990-07-01), Schrader et al.
patent: 4998141 (1991-03-01), Altmann
Banks Rodney H.
Wetegrove Robert L.
Evans F. L.
Nalco Chemical Company
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