Optics: measuring and testing – For optical fiber or waveguide inspection
Patent
1976-07-19
1979-07-03
Corbin, John K.
Optics: measuring and testing
For optical fiber or waveguide inspection
250571, 356418, 356419, G01N 2153, G01N 2130, G01J 350
Patent
active
041598741
ABSTRACT:
In an illustrated embodiment, brightness, color, opacity and fluorescent contribution to brightness of single thickness sheet material are measured by an optical measuring system providing for simultaneous measurement of transmitted and reflected light. One embodiment is designed so as to be capable of transverse scanning of a moving paper web on the paper machine. An optical window member of translucent diffusing material serves as a backing for the web for reflectance measurements and is in series with the web with respect to transmittance measurements. The optical window itself is selected as to its reflectance and transmittance so as to provide for periodic standardization of the instrument in an off-sheet position. Another embodiment will measure the same optical properties of single thickness sheet material selectively, with spectral response filters for characterizing such optical properties and with a series of narrow band filters. This latter embodiment also has the capability of measuring reflectance of an opaque pad of sheet material.
REFERENCES:
patent: 3762817 (1973-10-01), Harklau
patent: 3827808 (1974-08-01), Cho
patent: 4019819 (1977-04-01), Lodzinski
Aminco-Bowman "Spectrophotofluorometer" Instruction & Service Manual, Instructions #768, American Instrument Co., Wash., D.C. 10-1958, pp. 1-2.
Springer, G., "A Light Transmission Type On-Line Opacity Meter", Tappi, 3-1971, pp. 411-412.
King, J.A.E. "Colour Measurement", Paper Technology 7-1973, pp. 21-24.
Hunter, R. S. "New Reflectometer & its use for Whiteness Measurement", Jr. Optical Soc. America, vol. 50, 1-1960, pp. 44-48.
Norman et al., "New Optical Techniques", Paper Technology, 2-1973, pp. 17-21.
Hunter, R. S. "Achieving Accuracy in Measurements of Textiles for Reflectance & Whiteness", American Dyestuff Reporter, vol. 50, 10-16-61, pp. 45-53.
Rutledge, W. C. "Extended Outputs from a System with an On-Line Tristimulus Colorimeter & a Digital Computer", Tappi, 7-1971, pp. 1152-1155.
Dearth Leonard R.
Lodzinski Fred P.
Corbin John K.
Nekoosa Papers Inc.
Punter Wm. H.
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