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Journal of Optical Technology

Journal of Optical Technology

| SIMULTANEOUS RUSSIAN-ENGLISH PUBLICATION

  • Vol. 77, Iss. 4 — Apr. 1, 2010
  • pp: 284–287

Optospectral whiteness sensor and its use for monitoring the process of chlorine bleaching of cellulose

N. P. Belov, O. K. Pokoptseva, A. S. Sherstobitova, and A. D. Yas'kov  »View Author Affiliations


Journal of Optical Technology, Vol. 77, Issue 4, pp. 284-287 (2010)
http://dx.doi.org/10.1364/JOT.77.000284


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Abstract

This paper discusses the main regularities of the influence of chlorine-containing bleaching agents on the diffuse reflection spectra of cellulose pulp. General rules are given for the use of optical technologies to monitor the consumption of such reagents in cellulose-bleaching processes. A description is given of the structural features and the most important technical-operational characteristics of an optospectral whiteness sensor intended to regulate the consumption of chlorine-containing bleaches and the production process flow. Wavelengths 457, 600, and 1000nm are used to measure the reflectance. Based on an analysis of the results of production tests, recommendations are given for optimizing the use of such a sensor to make it possible to eliminate the influence of concentration changes of the cellulose pulp and the reduction during operation of the transparency of the sensor's input window, caused by its being “overgrown” in the process flow.

© 2010 Optical Society of America

Citation
N. P. Belov, O. K. Pokoptseva, A. S. Sherstobitova, and A. D. Yas'kov, "Optospectral whiteness sensor and its use for monitoring the process of chlorine bleaching of cellulose," J. Opt. Technol. 77, 284-287 (2010)
http://www.opticsinfobase.org/jot/abstract.cfm?URI=jot-77-4-284


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References

  1. L. A. Milovidova, G. V. Komarova, and T. A. Koroleva, The Bleaching of Cellulose (Izd. AGTU, Arkhangel'sk, 2005).
  2. P. Karjalainen and M. Otala, “Pulp brightness controlled with new Coram analyzer,” Pulp Paper Internat. No. 11, 52 (1972).
  3. T. M. Chan, R. G. Lightfoot, and A. K. Chatterjee, “On-line brightness measurement and control in pulp bleaching,” Pulp Pap. Mag. Can. 71, No. 10, 57 (1970).
  4. J. Strom and H. Weyrich, “Opticlor--a new approach to in-line chlorination control,” Pulp Paper Internat. No. 2, 54 (1972).
  5. R. Soila and P. Hyväri, “Automatische Weißagradmessung bei der Zellstoffbleiche,” Zellstoff und Papier No. 2, 36 (1975).
  6. ISO 2469:2007 “Paper, cardboard, and cellulose. Measuring the diffuse reflectance.”
  7. ISO 2470:1999 “Paper, cardboard, and cellulose. Measuring the diffuse reflectance in the blue region of the spectrum.”
  8. K. I. Aref'eva, Colored Optical Glass and Special Glasses: A Catalog, ed. G.T.Petrovskiĭ (Dom Optiki, Moscow, 1990).

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