New developments on fibre optic colorimetrie sensors for dissolved CO2 in aquatic environments
Data
2017
Autores
Almeida, José Manuel Marques Martins De
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Editora
IEEE
Resumo
The detection of dissolved carbon dioxide (dCO2) is made possible through a colorimetric effect that occurs in a sensitive membrane. The reaction with dCO2 changes the pH of the membrane causing a small difference in its colour which results in a characteristic absorbance spectrum band near 435 nm. A sensing platform based on this effect was developed and tested in gaseous and in aqueous environments. It is a combination of a bundle of large core fibre optics (with diameters above 200 µm) with light emission diodes (LEDs) in the visible range of the spectrum, a silicon photodetector and a polymer membrane sensitive to CO2. A variation in the absorption of 3 / %VV was obtained in the range from 0 to 1.6 % of gaseous CO2 with an estimated response time below 60 seconds.
Descrição
Palavras-chave
Colorimetric sensor , Fibre optic sensor , Sensitive membrane , Dissolved carbon dioxide
Citação
Coelho, L.; Pereira, Carlos; Mendes, Joao; Martins de Almeida, José Manuel Marques; Kovacs, B.; Balogh, K.; Borges, Teresa; Pedro A. S. Jorge. New developments on fibre optic colorimetrie sensors for dissolved CO<inf>2</inf> in aquatic environments, Trabalho apresentado em OCEANS 2017 - Aberdeen, In OCEANS 2017 - Aberdeen, Aberdeen, United Kingdom, 2017.