How does a polarization oxygen sensor work?

A polarization oxygen sensor is a type of dissolved oxygen sensor that uses a process called polarography to measure the concentration of dissolved oxygen in a liquid. Polarography is a type of voltammetry, which is a technique used to measure the concentration of electroactive species in a solution.

In a polarization oxygen sensor, the electrode that is used to measure the concentration of dissolved oxygen is placed in the liquid, and a constant current is applied to the electrode. This causes the dissolved oxygen in the liquid to react with the electrode, producing an electrical current. The strength of this current is proportional to the amount of dissolved oxygen present in the liquid.

The concentration of dissolved oxygen in the liquid is then calculated by measuring the voltage across the electrode. The voltage is typically measured using a technique called cyclic voltammetry, in which the applied current is alternated between positive and negative values. This allows for more accurate measurement of the voltage, and therefore more accurate determination of the dissolved oxygen concentration.

Polarization oxygen sensors are commonly used in water quality applications, such as monitoring the concentration of dissolved oxygen in rivers, lakes, and other bodies of water. They are also used in industrial processes, such as wastewater treatment, to monitor the amount of oxygen present in the water.

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