Laser Induced Fluorescence For Measurement Of Lignin Concentrations In Pulping Liquors

J. J. Horvath; H. G. Semerjian; K. L. Biasca; R. Attala

doi:10.1117/12.947860

29 November 1988 Laser Induced Fluorescence For Measurement Of Lignin Concentrations In Pulping Liquors

J. J. Horvath, H. G. Semerjian, K. L. Biasca, R. Attala

Proceedings Volume 0961, Industrial Optical Sensing; (1988) https://doi.org/10.1117/12.947860
Event: SPIE International Symposium on Optical Engineering and Industrial Sensing for Advance Manufacturing Technologies, 1988, Dearborn, MI, United States

Abstract

Laser excited fluorescence of pulping liquors was investigated for use in the pulp and paper industry for process measurement and control applications. Liquors from both mill and laboratory cooks were studied. A Nd-YAG pumped dye laser was used to generate the excitation wavelength of 280 nm; measurements were also performed using a commercially available fluorometer. Measurements on mill pulping liquors gave strong signals and showed changes in the fluorescence intensity during the cook. Absorption spectra of diluted mill liquor samples showed large changes during the cook. Samples from well controlled and characterized laboratory cooks showed fluorescence to be linear with concentration over two decades with an upper limit of approximately 1000 ppm dissolved lignin. At the end of these cooks a possible chemical change was indicated by an increase in the observed fluorescence intensity. Results indicate that lignin concentrations in pulping liquors can be accurately determined with fluorescence in the linear optical region over a greater dynamic range than absorption spectroscopy. Laser induced fluorescence may also provide an indication of chemical changes occurring in the lignin structure during a cook.

Citation Download Citation

J. J. Horvath, H. G. Semerjian, K. L. Biasca, and R. Attala "Laser Induced Fluorescence For Measurement Of Lignin Concentrations In Pulping Liquors", Proc. SPIE 0961, Industrial Optical Sensing, (29 November 1988); https://doi.org/10.1117/12.947860

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available