New developments on fibre optic colorimetric sensors for dissolved CO2 in aquatic environments

• Type: Article in International Conference Proceedings Book
• Date: 2017

Authors

Coelho, L (Author) FCUP; Carlos M Pereira (Author) FCUP; Mendes, J (Author) Other; Borges, T (Author) Other; Borges, MT (Author) FCUP; Jorge, PAS (Author) FCUP; Kovacs, B (Author) Other; Balogh, K (Author) Other

Conference proceedings International

Title: OCEANS 2017 - ABERDEEN

Pages: 1-5

Oceans Aberdeen Conference

Aberdeen, ENGLAND, JUN 19-22, 2017

Indexing

ISI Web of Knowledge - 0 Citations

Scopus - 2 Citations

Other information

Authenticus ID: P-00N-V34

DOI: 10.1109/oceanse.2017.8084989

Abstract (EN): The detection of dissolved carbon dioxide (dCO(2)) is made possible through a colorimetric effect that occurs in a sensitive membrane. The reaction with dCO(2) 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 mu m) 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 5