LED-LED portable oxygen gas sensor
Perez de Vargas-Sansalvador, Isabel M. and Fay, Cormac and Fernández-Ramos, M.D. and Diamond, Dermot and Benito-Lopez, Fernando and Capitan-Vallvey , L.F. (2012) LED-LED portable oxygen gas sensor. In: Europtrode 2012, 1-4 Apr 2012, Barcelona.
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A portable instrument for oxygen determination, based on the quenching of phosphorescent octaethylporphyrin by gaseous O2, has been developed using the fluorimetric paired emitter–detector diode technique (FPEDD). The instrument configuration used consists of two light emitting diodes (LEDs) facing each other including an interchangeable support containing a phosphorescent membrane in between, in which one of the LEDs is used as the light source (emitter LED) and the other working in reverse bias mode as the light detector. In this report, we study the feasibility of using a LED as a luminescent detector and realising a sensing instrument whose small size possibles to embed it into a portable measurement system. A complete study of instrument was carried out in order to optimise the specifications of the portable instrument such as: range, sensitivity, short term and long term stability, dynamical behaviour, temperature influence, humidity influence and temporal drift.
Keywords: Oxygen sensor, Gas sensor, Optical sensor, Paired emitter detector-diode sensor; Portable instrumentation.
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