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Proceedings Paper

Optimizing the performance of optical carbon dioxide gas sensors
Author(s): Andrew Mills; Qing Chang; Lorraine Wild
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Paper Abstract

The basic theory behind conventional colorimetric and fluorimetric optical sensors for CO2 is examined with respect to the effect on sensor response of the key parameters of initial base concentration and dye acid dissociation constant, KD. Experimental results obtained in aqueous solution using a variety of different dyes and initial base concentrations are reported and found to be consistent with the predictions made by the theoretical model. A series of model-generated pKD versus %CO2 curves for different initial base concentrations allow those interested in constructing an optical CO2 sensor to readily identify the optimum dye/initial base combination for their sensor; the response of the sensor can be subsequently fine-tuned through minor adjustment of the initial base concentration. The model appears also to apply to the new generation of plastic film CO2 sensor which have just been developed.

Paper Details

Date Published: 28 July 1994
PDF: 12 pages
Proc. SPIE 2131, Biomedical Fiber Optic Instrumentation, (28 July 1994); doi: 10.1117/12.180737
Show Author Affiliations
Andrew Mills, Univ. College of Swansea (United Kingdom)
Qing Chang, Univ. College of Swansea (United Kingdom)
Lorraine Wild, Univ. College of Swansea (United Kingdom)

Published in SPIE Proceedings Vol. 2131:
Biomedical Fiber Optic Instrumentation
James A. Harrington; David M. Harris; Abraham Katzir; Fred P. Milanovich, Editor(s)

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