Ozone sensor

Ozone sensor

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Caption: Ozone sensor held in a pair of hands. The sensor is on the reverse of the device. This side is the electrical radio circuit that transmits the data (a radiosonde circuit). The round structure (upper centre) is the battery. The white structure (lower right) is the sensor, an ECC (Electrochemical Concentration Cell). It detects ozone by the flow of an electric current as ozone reacts with the chemicals in the cell. The sensor, carried high into the atmosphere by a weather balloon, is used to study polar depletion (ozone holes) of Earth's protective ozone layer. Photographed at the Finnish Meteorological Institute's Arctic Research Centre (FMI-ARC), Sodankyla, in Finnish Lapland.

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