Abstract
Dissolved oxygen is an important index to evaluate water quality, and its concentration is of great significance in industrial production, environmental monitoring, aquaculture, food production, and other fields. As its change is a continuous dynamic process, the dissolved oxygen concentration needs to be accurately measured in real time. In this paper, the principles, main applications, advantages, and disadvantages of iodometric titration, electrochemical detection, and optical detection, which are commonly used dissolved oxygen detection methods, are systematically analyzed and summarized. The detection mechanisms and materials of electrochemical and optical detection methods are examined and reviewed. Because external environmental factors readily cause interferences in dissolved oxygen detection, the traditional detection methods cannot adequately meet the accuracy, real-time, stability, and other measurement requirements; thus, it is urgent to use intelligent methods to make up for these deficiencies. This paper studies the application of intelligent technology in intelligent signal transfer processing, digital signal processing, and the real-time dynamic adaptive compensation and correction of dissolved oxygen sensors. The combined application of optical detection technology, new fluorescence-sensitive materials, and intelligent technology is the focus of future research on dissolved oxygen sensors.
Highlights
Dissolved oxygen (DO) refers to free and non-compound oxygen in water or other liquids, which is involved in various biochemical and physiological activities [1,2]
Dissolved oxygen detection technology developed from iodometric titration was initially used as a laboratory method
Due to the development of electrochemical technology and fluorescence technology, electrochemical and optical dissolved oxygen sensors were designed according to their respective principles
Summary
Dissolved oxygen (DO) refers to free and non-compound oxygen in water or other liquids, which is involved in various biochemical and physiological activities [1,2]. The intelligent dissolved oxygen sensor has the ability of real-time signal acquisition and intelligent data processing, which can meet the requirements of the long-term in situ measurement of the dissolved oxygen content, and effectively overcome the problems of the traditional detection technology [22]. By comparing the three detection technologies and their improvement methods, it is highlighted that the fluorescence quenching dissolved oxygen sensor based on optical fiber has better performance, but the accuracy and real-time performance still cannot meet the requirements of in situ long-term online measurement; the market is driving the development of optical dissolved oxygen sensor toward an intelligent direction. Sensors 2019, 19, x FOR PEER REVIEW intelligent detection technology of dissolved oxygen is further studied from three aspects: intelligent signal transmission, digitalfrom signal processing, and adaptive real-time compensation.
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