Optimizing the performance of optical carbon dioxide gas sensors

Andrew Mills; Qing Chang; Lorraine Wild

doi:10.1117/12.180737

28 July 1994 Optimizing the performance of optical carbon dioxide gas sensors

Andrew Mills, Qing Chang, Lorraine Wild

Proceedings Volume 2131, Biomedical Fiber Optic Instrumentation; (1994) https://doi.org/10.1117/12.180737
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

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, K_D. 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 pK_D 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.

Citation Download Citation

Andrew Mills, Qing Chang, and Lorraine Wild "Optimizing the performance of optical carbon dioxide gas sensors", Proc. SPIE 2131, Biomedical Fiber Optic Instrumentation, (28 July 1994); https://doi.org/10.1117/12.180737

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