26 July 2011 Colorimetric and refractometric measurements of carbon dioxide
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Proceedings Volume 8001, International Conference on Applications of Optics and Photonics; 80013C (2011) https://doi.org/10.1117/12.892091
Event: International Conference on Applications of Optics and Photonics, 2011, Braga, Portugal
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.
© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
C. Jesus Gouveia, A. Markovics, J. M. Baptista, B. Kovács, P. A. S. Jorge, "Colorimetric and refractometric measurements of carbon dioxide", Proc. SPIE 8001, International Conference on Applications of Optics and Photonics, 80013C (26 July 2011); doi: 10.1117/12.892091; https://doi.org/10.1117/12.892091
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