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Proceedings Paper

Characterization of a novel dissolved CO2 sensor for utilization in environmental monitoring and aquaculture industry
Author(s): K. Balogh; João M. Jesus; C. Gouveia; Jorge O. Domingues; A. Markovics; J. M. Baptista; B. Kovacs; Carlos M. Pereira; Maria-Teresa Borges; P. A. S. Jorge
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Paper Abstract

A novel optical fiber sensor is presented for measuring dissolved CO2 for water quality monitoring applications, where the optical signal is based either on refractive index changes or on color change. The sensing chemistry is based on the acid-basic equilibrium of 4-nitrophenol, that is converted into the anionic form by addition quaternary ammonium hydroxide. The CO2 sensitive layer was characterized and tested by using simple absorbance/reflectance measurement setups where the sensor was connected to a fiber optic CCD spectrometer. A prototype simulating a real shallow raceway aquaculture system was developed and its hydraulic behavior characterized. A commercially available partial-pressure- NDIR sensor was used as a reference for dissolved CO2 tests with the new optical fiber sensor under development. Preliminary tests allowed verifying the suitability of the new optical sensor for accurately tracking the dissolved carbon dioxide concentration in a suitable operation range. Direct comparison of the new sensor and the reference sensor system allowed to demonstrate the suitability of the new technology but also to identify some fragilities there are presently being addressed.

Paper Details

Date Published: 18 November 2013
PDF: 7 pages
Proc. SPIE 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications, 8785FC (18 November 2013); doi: 10.1117/12.2027518
Show Author Affiliations
K. Balogh, INESC Porto (Portugal)
Univ. of Pécs (Hungary)
João M. Jesus, CIIMAR (Portugal)
C. Gouveia, INESC Porto (Portugal)
Univ. da Madeira (Portugal)
Jorge O. Domingues, CIIMAR (Portugal)
A. Markovics, Univ. of Pécs (Hungary)
J. M. Baptista, Univ. da Madeira (Portugal)
B. Kovacs, Univ. of Pécs (Hungary)
Carlos M. Pereira, Univ. do Porto (Portugal)
Maria-Teresa Borges, CIIMAR (Portugal)
Univ. do Porto (Portugal)
P. A. S. Jorge, INESC Porto (Portugal)

Published in SPIE Proceedings Vol. 8785:
8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications
Manuel Filipe P. C. Martins Costa, Editor(s)

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