Colorimetric and refractometric measurements of carbon dioxide

• Type: Article in International Conference Proceedings Book
• Date: 2011

Authors

Gouveia, C (Author) Other; Markovics, A (Author) Other; Baptista, JM (Author) Other; Kovacs, B (Author) Other; Jorge, PAS (Author) FCUP

Conference proceedings International

Title: International Conference on Applications of Optics and Photonics

International Conference on Applications of Optics and Photonics

Braga, Portugal, 3 a 7 de Maio de 2011

Indexing

ISI Web of Knowledge - 1 Citation

Scopus - 1 Citation

Other information

Authenticus ID: P-002-X8C

DOI: 10.1117/12.892091

Abstract (EN): 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 (lambda c 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 CO2 also induces refractive index changes in the sensitive layer. Using a fiber based interferometric setup, a CO2 dependent refractive index change of similar to 0.045 RIU was observed, in the 0%-90% CO2 concentration range.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 5