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Journal of Flow Visualization and Image Processing
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.5

ISSN 印刷: 1065-3090
ISSN オンライン: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v9.i2-3.60
21 pages

2D THICKNESS AND TEMPERATURE MAPPING OF FLUIDS BY MEANS OF A TWO-DYE LASER INDUCED FLUORESCENCE RATIOMETRIC SCHEME

Carlos H. Hidrovo
Hatsopoulos Microfluids Laboratory, Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge, MA 02139, U.S.A.

要約

This paper presents the principles behind the use of a two-dye Laser Induced Fluorescence (LIF) technique for two-dimensional film thickness and temperature mapping of fluids. The need for two fluorescent emissions arises as a consequence of the fluorescence dependence on excitation light intensity. A ratiometric scheme that normalizes the fluorescent emission of one dye against the fluorescent emission of a second dye is used in order to eliminate undesirable effects due to illumination intensity fluctuations, in both space and time, and optical distortions. The same ratiometric scheme is applied for both film thickness and temperature measurements, but the required spectral characteristics of the dyes used and the optical conditions differ significantly between the two measurements. The concepts of emission reabsorption and optical thickness are discussed in light of the requirements for each particular measurement. Experimental validation of the technique in measuring the thickness and temperature of a film of lubricating oil is also presented.


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