Optics: measuring and testing – By dispersed light spectroscopy – With sample excitation
Patent
1991-09-23
1993-06-01
McGraw, Vincent P.
Optics: measuring and testing
By dispersed light spectroscopy
With sample excitation
2504611, 162 49, G01J 330, G01N 2164, D21C 714
Patent
active
052164837
ABSTRACT:
A method and apparatus for measuring lignin concentration in a sample of wood pulp or black liquor comprises a light emitting arrangement for emitting an excitation light through optical fiber bundles into a probe which has an undiluted sensing end facing the sample. The excitation light causes the lignin concentration to produce fluorescent emission light which is then conveyed through the probe to analyzing equipment which measures the intensity of the emission light. Measures a
REFERENCES:
patent: 4650336 (1987-03-01), Moll
patent: 4837446 (1989-06-01), Renard et al.
patent: 4842689 (1989-06-01), Jikka et al.
patent: 4889593 (1989-12-01), Tikka et al.
patent: 4895618 (1990-01-01), Tikka et al.
Kubulnieks, E. et al., "The STFI OPTI-Kappa Analyzer, Applications and Accuracy," Tappi Journal, Nov. 1987 pp. 38-42.
Horvath, J. J. and Semerjian, H. G., "Laser Excited Fluorescence Studies of Black Liquor," SPIE, Quebec City, Canada, Jun. 4-6 1986 pp. 258-264.
TAPPI Procedure T-236 hm-85, "Kappa Number of Pulp" publication date unknown--admitted prior art.
Hartler, N. and Norrstrom, H., "Light Absorbing Properties of Pulp and Pulp Components," TAPPI Journal, vol. 52, No. 9, Sep. 1969.
Kleinert, T. N. and Joyce, C. S., "Short Wavelength Ultraviolet Absorption of Various Lignins and Related Substances", Part I, Pulp and Paper Mag Can. 58, No. 5, Apr. 1957, pp. 154-158.
Id., Part II, No. 6, May 1957, pp. 131-148.
Id., Part III, No. 7, Jun. 1957, pp. 215-219.
Id., Part IV, Oct. 1957, pp. 147-152.
Norrstrom, B. and Teder, A., "Absorption Bands in Electronic Spectra of Lignins, Part 2, Band Intensities for Alkeli Lignins from Spruce", Svensk Papperstidning, Jun. 15, 1971.
Sjostrom, E. and Haglund, P., "Spectrophotometric Determination of the Dissolution of Lignin During Sulfite Cooking," TAPPI Journal, vol. 47, No. 5, May 1964.
Baumgartner, D. J., Feldman, M. H., and Gibbons, C. L., "A Procedure for Tracing Kraft Mill Effluent from an Ocean by Constituent Fluorescence," Water Research, Pergamom Press, vol. 5, 1971, pp. 533-544.
Bublitz, W. J. and Wade, D. C., "Applied Waste Liquor Fluorescence to Control Pulp Quality", Svensk Papperstidning, No. 18, 1979.
Wilander, A., Kvarnas, H. and Lindell, T., "A Modified Fluorometric Method for Measurement of Lignin Sulfonates and its In Situ Application in Natural Waters," Water Research, vol. 8, pp. 1037-1045, 1974.
Denias, J. N., Excited State Lifetime Measurements, Academic Press, New York 1983, pp. 53-58.
Tikka, P. O. and Virkola, N. E., "A New Kraft Pulping Analyzer for Monitoring Organic and Inorganic Substances," TAPPI Journal, Jun., 1966, pp. 66-71.
Williams, D. J., "The Application of Ultra-Violet Absorption Characteristic of Lignin to the Control of Pulp Uniformity," Appita, vol. 22, No. 2, Sep. 1968, pp. 45-52.
Carpart, R., Obese-Jecty, K., LeCardinal, G., and Gelus, M. "Contribution to the On-Line Kraft Pulping Control," PRP 4 Proceedings Ghent, 1980.
Bublitz, W. J., "Fluorescence of Pulping Liquors: A Tool for Digester Control?", TAPPI, Jun. 1981 vol. 64, No. 6, pp. 73-76.
Copies of Overheads used in two oral presentations: (1) Optical Society of America; and (2) Department of Energy/Industry Sensor Working Group Meeting, both oral presentations Oct. 1989.
Abstract published for above presentations.
Berthold John W.
Jeffers Larry
Malito Michael L.
Edwards Robert J.
Hantis K. P.
Kalka Daniel S.
Matas Vytas R.
McGraw Vincent P.
LandOfFree
Fluorescence analyzer for lignin does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fluorescence analyzer for lignin, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fluorescence analyzer for lignin will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1818606