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Proceedings Paper

Colorimetric and refractometric measurements of carbon dioxide
Author(s): C. Jesus Gouveia; A. Markovics; J. M. Baptista; B. Kovács; P. A. S. Jorge
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Paper Abstract

In this work, a polymeric sensitive layer based on the acid-base equilibrium of phenol and of its derivative p-nitro-phenol is presented for carbon dioxide measurements. Thin films casted on glass slides were tested, using a LED source (λc at 410 nm) and an Ocean Optics USB4000 spectrometer, in the 0% to 15.25% CO2 concentrations range, showing a 40% maximum transmittance variation with a 51s response time and a 0.15% resolution. Preliminary results indicate that CO2also induces refractive index changes in the sensitive layer. Using a fiber based interferometric setup, a CO2 dependent refractive index change of ~0.045 RIU was observed, in the 0%-90% CO2 concentration range.

Paper Details

Date Published: 26 July 2011
PDF: 5 pages
Proc. SPIE 8001, International Conference on Applications of Optics and Photonics, 80013C (26 July 2011); doi: 10.1117/12.892091
Show Author Affiliations
C. Jesus Gouveia, INESC Porto (Portugal)
Univ. da Madeira (Portugal)
A. Markovics, South Trans Danubian Research Cooperative (Hungary)
J. M. Baptista, INESC Porto (Portugal)
Univ. da Madeira (Portugal)
B. Kovács, South Trans Danubian Research Cooperative (Hungary)
Univ. of Pécs (Hungary)
P. A. S. Jorge, INESC Porto (Portugal)


Published in SPIE Proceedings Vol. 8001:
International Conference on Applications of Optics and Photonics

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