Instrumentation for optical measurement of dissolved oxygen based on solid state technology

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Abstract
A number of measurement schemes for the determination of dissolved or gaseous oxygen have been reported, most of them based on fluorescence quenching methods. They have the disadvantage of requiring large and heavy instrumentation and, therefore, are not suitable for micro-integrated technologies. As a result, the applicability is greatly limited. We introduce a system based on semiconductor devices (LEDs, photodiodes, low cost analogue and digital components) which is well suited for hybrid solutions, and represents a realistic alternative to existing micro integrated electrochemical probes. New LED-compatible sensor membranes were developed and characterized. The influence of straylight on the overall transfer function of the sensor system was investigated and possibilities for reduction or even elimination of this influence are presented. The overall performance of the instrument in terms of sensitivity, detection limits, long-term stability, and reproducibility is presented. The system was applied to the measurement of dissolved oxygen in drinking water and sea water.

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