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Laser measurement of the spectral extinction coefficients of fluorescent, highly absorbing liquidsA conceptual method is developed to deduce rapidly the spectral extinction coefficient of fluorescent, highly absorbing liquids, such as crude or refined petroleum oils. The technique offers the advantage of only requiring one laser wavelength and a single experimental assembly and execution for any specific fluorescent liquid. The liquid is inserted into an extremely thin wedge-shaped cavity for stimulation by a laser from one side and flurescence measurement on the other side by a monochromator system. For each arbitrarily selected extinction wavelength, the wedge is driven slowly to increasing thicknesses until the fluorescence extinguishes. The fluorescence as a function of wedge thickness permits a determination of the extinction coefficient using an included theoretical model. When the monochromator is set to the laser emission wavelength, the extinction coefficient is determined using the usual on-wavelength signal extinction procedure.
Document ID
19820049475
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Hoge, F. E.
(NASA Wallops Flight Center Wallops Island, VA, United States)
Date Acquired
August 10, 2013
Publication Date
May 15, 1982
Subject Category
Lasers And Masers
Accession Number
82A33010
Distribution Limits
Public
Copyright
Other

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