Design Of A In-situ Dissolved Oxygen Detector Using Fluorescence Quenching

Dissolved Oxygen is highly correlated to the marine organism and is used to estimate the environment in the ocean. The detection of DO is quite important in the protection of marine ecological environment and marine experiments. Research of DO is significant in the exploration of the resource in the ocean, and the DO concentration is also a useful parameter in mariculture. Therefore, It is necessary to design and develop a high-sensitivity, low-power, real-time and continuous detecting instrument for deep sea in situ measurements of DO.Based on discussions about domestic and international development of the DO a detecting instrument, a new DO detector which used fluorescence quenching techniques was designed. The detector integrated the mechanics, optics, electronics, computer technology, and achieved high-sensitivity, high-stability, low-power performance.Experiments were designed to test the capacities of the detector. And the results showed that:the system response time was less than40s, the detecting accuracy was up to0.02mg/L. the lifetime of the sensor was up to6months, and the average current consumption was only10mA, all of which indicated the detector was able to make a good performance in the deep sea DO a measurements.The paper included6chapters:Chapter1describes the background and significance of the research, the domestic and international development of DO detecting instruments. And a high-sensitivity, low-power DO detector was proposed to design in the chapter.Chapter2introduced the theory of fluorescence quenching and DO phase detecting. And introduced the framework of the DO detector.Chapter3described the structure design of the instrument hardware circuits as a whole and every single part.Chapter4focused on system software design.Chapter5focused on the experiments and result analysis. Chapter6was a summary of the paper and a prospect for the further research.