Abstract
The determination of oxygen concentration plays a crucial role in many fields, such as industrial production, environmental monitoring, food and drug safety, and clinical medicine. Hence, oxygen sensors have become indispensable instruments for many applications. This paper reviews the current status and development of gaseous and dissolved oxygen sensors. For the former, manufacturing methods of the electrochemical and optical devices are discussed with a performance comparison, as well as specific applications. For dissolved oxygen sensors, the existing detection methods and principles of dissolved oxygen measurement are reviewed, including the Winkler method, the Clark electrode, and the luminescence dissolved oxygen sensors based on fluorescence quenching. The manufacturing methods and the sensing characteristics of oxygen-sensitive membranes are described. In conclusion, the advantages and limitations of oxygen sensors and their suggested further development are discussed.
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