Radiant energy – Luminophor irradiation – With ultraviolet source
Patent
1991-09-23
1993-06-15
Hannaher, Constantine
Radiant energy
Luminophor irradiation
With ultraviolet source
2504581, 2504591, 162 49, G01N 2164
Patent
active
052201724
ABSTRACT:
A method and appartus for measuring lignin concentration in an undiluted 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 a 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 are taken to maximize the emission light intensity which is due to lignin concentration and distinguish it from background and interfering light. The fluorescent light intensity is found to drop off in a predictable manner with increased lignin concentration.
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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.
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Berthold John W.
Jeffers Larry
Malito Michael L.
Edwards Robert J.
Glick Edward J.
Hannaher Constantine
Kalka Daniel S.
Matas Vytas R.
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