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Modelling the reponse features of optical sensors for oxygen: an overview

Mills, A. (2003) Modelling the reponse features of optical sensors for oxygen: an overview. Proceedings of SPIE the International Society for Optical Engineering, 3856. pp. 232-242. ISSN 0277-786X

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The response features of optical oxygen sensors based on luminescence quenching are complex and typically include downward curving Stern-Volmer plots and multi-exponential luminescence decays in the absence and presence of oxygen. The principle features and failings of some of the established models used to describe these response features are considered. A new model is introduced: 'a log-Gaussian distribution in (tau) 0 and kq,i ' model, or 'log- Gaussian' model for short. The key basic equations of this model are given and appear able to simulate the diverse response characteristics of many optical oxygen sensor. The model is used to fit the observed Stern Volmer plots and luminescence decays for two real sensors. The model appears to provide a reasonable physical basis for the very diverse response characteristics observed for optical oxygen sensors.