Zirconia is commonly used for oxygen sensing. In addition to this technique, SST Sensing Ltd. has added the LuminOx family of optical oxygen sensors to its product offerings.

The sensors use fluorescence quenching by oxygen where pulsed light is directed onto an oxygen-sensitive fluorescent dye causing it to fluoresce.   The rate at which this fluorescence decays is inversely proportional to the amount of oxygen present in the vicinity. Because the phenomenon does not deplete the fluorescent dye, the sensors can be deployed for prolonged periods and remain in service for over 5 years.

In addition to measuring oxygen in terms of either partial pressure (ppO₂) or oxygen concentration (vol. %), the sensors are fully compensated for temperature and barometric pressure.

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