The fluorescence spectra of Bulgarian and French wines of the same price class were obtained at excitation wavelengths of 265 nm, 275 nm and 295 nm. The excitation-emission matrices are obtained and compared. A correlation between the emission maxima and the anthocyanins or the antioxidant activity expressed in Trollox units is obtained.
In the present work we study the effect of the length of fluorescent dye-filled micro-capillaries on the fluorescence
spectra. Two types of micro-capillaries have been studied: a 100 μm inner diameter fused silica capillary with a
transparent coating and one of the holes of a fiber optic glass ferrule with 125 μm inner diameter. The tubes were filled
with solutions of Rhodamine 6G dissolved in ethanol and then in glycerin. Experimental data show that the maximum
fluorescence and the largest spectral widths are observed for a sample length of about 0.25 mm for the used
concentration. This results show that miniature tunable fiberized dye lasers can be developed using available standard
micro-and fibre-optic components.
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