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How an Optical Oxygen sensor works

How is it possible that the oxygen concentration in beverages can be quantified by means of light? Just read and learn the basics!

Few components provide a lot of information

An optical oxygen (O2) sensor quickly and reliably detects the amount of O2 in liquid or gaseous media. Generally, the O2 measurement remains unaffected by other gases. An optical O2 sensor consists of

  • a light-emitting diode (LED),
  • an inert carrier holding the light-sensitive layer where dye molecules are embedded in a polymer matrix and protected by an optical insulation layer,
  • and a photodiode plus filter to quantify the emitted light.

The sensor’s characteristics speak for themselves:

  • Non-destructive: no oxygen consumed during measurement
  • User-friendly: no electrolyte needed, no polarization time required
  • Ecologically friendly: no chemicals required

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