Research Progress of Optical Dissolved Oxygen Sensors: A Review

Dissolved oxygen (DO) 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 DO is of utmost importance. In recent years, DO 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 article provides an overview of optical sensor methods for detecting DO and presents a summary of the notable developments in optical DO sensors. This article begins by outlining the importance and challenges associated with DO sensors, followed by a categorization of optical DO sensors into fluorescence, colorimetric, spectrophotometry, and chemiluminescent methods based on their respective detection principles. In addition, it highlights the latest advancements in optical DO sensing, including new materials, reaction systems, and intelligent algorithms. This article concludes by analyzing and forecasting the future development direction of optical DO sensors based on current research trends.