Characterization of a novel dissolved CO2 sensor for utilization in environmental monitoring and aquaculture industry

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

doi:10.1117/12.2027518

18 November 2013 Characterization of a novel dissolved CO₂ sensor for utilization in environmental monitoring and aquaculture industry

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

Author Affiliations +

Proceedings Volume 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications; 8785FC (2013) https://doi.org/10.1117/12.2027518
Event: 8th Ibero American Optics Meeting/11th Latin American Meeting on Optics, Lasers, and Applications, 2013, Porto, Portugal

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.

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K. Balogh, João M. Jesus, C. Gouveia, Jorge O. Domingues, A. Markovics, J. M. Baptista, B. Kovacs, Carlos M. Pereira, Maria-Teresa Borges, and P. A. S. Jorge "Characterization of a novel dissolved CO₂ sensor for utilization in environmental monitoring and aquaculture industry", Proc. SPIE 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications, 8785FC (18 November 2013); https://doi.org/10.1117/12.2027518

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