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Title: On-line measurement of lignin in wood pulp by color shift of fluorescence

Lignin concentrations from wood pulp samples are measured by applying an excitation light at a selected wavelength to the samples in order to cause the lignin to emit fluorescence. A spectral distribution of the fluorescence emission is then determined. The lignin concentration is then calculated based on the spectral distribution signal. The spectral distribution is quantified by either a wavelength centroid method or a band ratio method.
Inventors:
 [1];  [2]
  1. (Washington Township, Stark County, OH)
  2. (Liberty Township, Trumbull County, OH)
Issue Date:
OSTI Identifier:
870267
Assignee:
Babcock & Wilcox Company (New Orleans, LA) ORO
Patent Number(s):
US 5486915
Contract Number:
FC05-90CE40905
Research Org:
BABCOCK & WILCOX CO
Country of Publication:
United States
Language:
English
Subject:
on-line; measurement; lignin; wood; pulp; color; shift; fluorescence; concentrations; samples; measured; applying; excitation; light; selected; wavelength; emit; spectral; distribution; emission; determined; concentration; calculated; based; signal; quantified; centroid; method; band; ratio; spectral distribution; selected wavelength; excitation light; fluorescence emission; lignin concentration; wood pulp; calculated based; ratio method; selected wave; /356/162/250/