METROLOGICAL ASSESSMENT OF FLUORESCENCE SIGNALS OF MEASUREMENTS OF PIGMENTS IN WATER / AVALIAÇÃO METROLÓGICA DA RESPOSTA DE SINAIS DE FLUORESCÊNCIA PARA MEDIÇÕES DE PIGMENTOS EM ÁGUA

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

Aim. Providing reliability of LIDAR readings of fluorescence signals for measurements of pigments in ocean water by: (i) establishing configuration standards for equipment parameters. (ii) assessing different procedures to improve the signal-tonoise relationship. (iii) preserving the integrity of the wavelength bandwidth of the fluorescence spectrum. (iv) verifying the repeatability of wavelength measurements associated with local maxima of the Raman scattering curve of ocean water and chlorophyll a, as well as organic materials (dissolved in water) bandwidths. (v) and assessing the efficiency of the methodology developed for obtaining relative concentrations of chlorophyll a. Motivation. Contributing to the development of remote monitoring when using the LIDAR technique. This would bring about greater reliability. Context. Over the years environmental surveillance has been adopted by many companies and institutions as an effective practice to minimize harmful impacts on the environment. The remote monitoring is unquestionably a versatile alternative for detecting possible leaking of noxious substances before they become apparent. Methodology. The procedures included: (i) collecting information of different physical models of remote monitoring. (ii) collecting data from experiments carried out in the laboratory and in situ. (iii) and developing a procedure to analyze signal information. Results. Two approaches were adopted when carrying out the experiments: (i) in the laboratory, by evaluating fluorescence signal fluctuations of the Raman scattering in ocean water for different equipment parameters. (ii) and in situ, by measuring the relative concentration of chlorophyll a in ocean water for different schemes in order to choose the standard one. Conclusions. The remote monitoring is a useful tool to carry out environmental surveillance. But to increase the reliability of data collected by the optical-laser system apparatus the introduction of metrological assessment procedures is mandatory.

ASSUNTO(S)

metrology fluorescence clorofila lidar system pigmentos sistema lidar fluorescencia pigments chlorophyll metrologia

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