Research Progress of Optical Dissolved Oxygen Sensors ——A review

Dissolved oxygen is a crucial component for supporting life activities and serves as a key indicator for monitoring water quality. It plays a significant role in various fields, including chemistry, biochemistry, and environmental studies. Achieving accurate in-situ measurement of dissolved oxygen is of utmost importance. In recent years, dissolved oxygen sensors based on optical detection principles have gained prominence due to their advantages of fast response, simplified signal acquisition, and ease of miniaturization. This review paper provides an overview of optical sensor methods for detecting dissolved oxygen, and presents a summary of the notable developments in optical dissolved oxygen sensors. The paper begins by outlining the importance and challenges associated with dissolved oxygen sensors, followed by a categorization of optical dissolved oxygen sensors into fluorescence, colorimetric, spectrophotometry, and chemiluminescent methods based on their respective detection principles. Additionally, it highlights the latest advancements in optical dissolved oxygen sensing, including new materials, reaction systems, and intelligent algorithms. The paper concludes by analyzing and forecasting the future development direction of optical dissolved oxygen sensors based on current research trends.