Optics: measuring and testing – For optical fiber or waveguide inspection
Patent
1977-03-07
1980-09-09
McGraw, Vincent P.
Optics: measuring and testing
For optical fiber or waveguide inspection
356429, G01N 2100
Patent
active
042220645
ABSTRACT:
In an illustrated embodiment, brightness, color, opacity and fluorescent contribution to brightness are measured by an on-line sensing head providing for simultaneous measurement of transmitted and reflected light. By measuring two independent optical parameters, paper optical properties of a partially translucent web are accurately characterized substantially independently of paper grade and weight. The instrument is designed so as to be capable of transverse scanning of a moving paper web on the paper machine, and so as to monitor desired paper optical characteristics with sufficient accuracy to enable on-line control of the optical characteristics of the paper being manufactured. Advantageously, several sets of reflectance and transmittance values based on respective common spectral response functions are sensed continuously and/or simultaneously during movement of the web.
REFERENCES:
patent: 2429331 (1947-10-01), Sachtleben
patent: 3827808 (1974-08-01), Cho
Rutledge; "Extended outputs from a system with an On-Line Tristimulus Colorimeter & a Digital Computer", Tappi, vol. 54, No. 7, Jul. 71, pp. 1152-1155.
McGraw Vincent P.
Nekoosa Papers Inc.
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