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A new LED-LED portable CO2 gas sensor based on an interchangeable membrane system for industrial applications

Vargas-Sansalvador, I.M. Pérez and Fay, Cormac and Phelan, Thomas and Fernández-Ramos, M.D. and Capitán-Vallvey, L.F. and Diamond, Dermot and Benito-Lopez, Fernando (2011) A new LED-LED portable CO2 gas sensor based on an interchangeable membrane system for industrial applications. Analytica Chimica Acta, 699 (2). pp. 216-222. ISSN 0003-2670

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Abstract

A new system for CO2 measurement (0-100%) by based on a paired emitter-detector diode arrangement as a colorimetric detection system is described. Two different configurations were tested: configuration 1 (an opposite side configuration) where a secondary inner-filter effect accounts for CO2 sensitivity. This configuration involves the absorption of the phosphorescence emitted from a CO2-insensitive luminophore by an acid-base indicator and configuration 2 wherein the membrane containing the luminophore is removed, simplifying the sensing membrane that now only contains the acid-base indicator. In addition, two different instrumental configurations have been studied, using a paired emitter-detector diode system, consisting of two LEDs wherein one is used as the light source (emitter) and the other is used in reverse bias mode as the light detector. The first configuration uses a green LED as emitter and a red LED as detector, whereas in the second case two identical red LEDs are used as emitter and detector. The system was characterised in terms of sensitivity, dynamic response, reproducibility, stability and temperature influence. We found that configuration 2 presented a better CO2 response in terms of sensitivity.

Item Type:Article (Published)
Refereed:Yes
Uncontrolled Keywords:Carbon dioxide sensor; Gas sensor; Optical sensor; Paired emitter detector-diode sensor; Portable instrumentation
Subjects:Engineering > Mechanical engineering
Engineering > Electronics
Engineering > Electronic engineering
Physical Sciences > Chemistry
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Science and Health > School of Chemical Sciences
Research Initiatives and Centres > CLARITY: The Centre for Sensor Web Technologies
Research Initiatives and Centres > National Centre for Sensor Research (NCSR)
Publisher:Elsevier
Official URL:http://dx.doi.org/10.1016/j.aca.2011.05.019
Copyright Information:© 2011 Elsevier
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
Funders:Ministerio de Ciencia e Innovacion (CTQ2009-11428-C02-01), Direccion General de Investigacion y Gestion del Plan Nacional de I+D+i (CTQ2009-14429-C02-02), Jaunta de Andalucia (Proyecto de Excelencia P08-FQM-3535), Science Foundation Ireland
ID Code:16494
Deposited On:25 Aug 2011 14:01 by Cormac Fay. Last Modified 25 Aug 2011 14:01

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