Possibility of standardization of normalized fluorescent parameter as a measure of organic admixture concentration in water and atmosphere

Viktor V. Fadeev

doi:10.1117/12.364210

16 September 1999 Possibility of standardization of normalized fluorescent parameter as a measure of organic admixture concentration in water and atmosphere

Viktor V. Fadeev

Author Affiliations +

Proceedings Volume 3821, Environmental Sensing and Applications; (1999) https://doi.org/10.1117/12.364210
Event: Industrial Lasers and Inspection (EUROPTO Series), 1999, Munich, Germany

Abstract

Fluorescence of organic admixtures in water and atmosphere is the main information source for express diagnostics of the environment. A quarter of century ago it was proposed to normalize fluorescence intensity to the intensity of Raman scattering by molecules of the main component of medium (water in water medium, nitrogen in atmosphere) and to measure the normalized fluorescent parameter (Phi) _O equals I_fl^O/I_RS, where I_fl^O is fluorescence intensity (or number of photons) of the admixture in absence of saturation, I_RS is the intensity (or number of photons) of the Raman scattering by water (or nitrogen) molecules. In fact, the parameter (Phi) _O is the fluorescent signal from unit volume (of water or atmosphere) normalized to the intensity of exciting optical radiation. Some requirements being fulfilled, the parameter (Phi) _O is a linear measure of concentration of the admixture, independent of characteristics of medium and device, therefore, it can be proposed as a standardized parameter in fluorescent diagnostics of organic admixtures. These requirements are analyzed in this paper. The stability and controllability of some parameters which determine the value of the coefficient (alpha) in the formula C equals (alpha) (Phi) _O (where C is the admixture concentration) are discussed in this paper. These parameters are: (1) relative dispersion of the attenuation index (Delta) (epsilon) /(epsilon) , where (Delta) (epsilon) equals (epsilon) ((lambda) _fl)-(epsilon) ((lambda) _R); (2) fluorescence cross section of the admixture, and (3) Raman scattering cross section of water (nitrogen). The analysis showed that the fluorescent parameter (Phi) _O can be an independent characteristic of organic pollutants content in water (or atmosphere) parallel with the other optical indices of water quality (or atmosphere quality), for example, coefficients of absorption and of scattering, colorness index etc.

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Viktor V. Fadeev "Possibility of standardization of normalized fluorescent parameter as a measure of organic admixture concentration in water and atmosphere", Proc. SPIE 3821, Environmental Sensing and Applications, (16 September 1999); https://doi.org/10.1117/12.364210

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