Oxygen sensors general discussion

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Potential applications of chemical sensors are diverse and numerous, and the environment where the sensor is used varies. Therefore, chemical sensor often requires to be tailor-made or semi-tailor-made to meet the needs in the special circumstance. For example, sensing of oxygen in an automobile exhaust or in water or in blood can be accomplished by using an electrochemical-based sensor. However, the selection of electrolyte and a diffusion-limited layer or protective membrane will be different in each case. Therefore, the platform chemical sensor technology is discussed in general. Special applications of a chemical sensor under a particular circumstance need to be addressed separately. 

There are several techniques nsed to determine the dissolved oxygen content in a fluid. In practice, five general methods exist chemical, volumetric, tubing, optodes, and the electrochemical electrode (Carroll, 1991 van Dam-Mieras et al., 1992). This section will discuss these methods and some of their limitations and uses the emphasis, however, will be on electrochemical electrodes as they are the most common dissolved O2 sensors. 

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