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Development of Optical Oxygen Sensor and Its Application in Environmental Monitoring

Author: LiJiaZuo
Tutor: XieZengHong
School: Fuzhou University
Course: Analytical Chemistry
Keywords: Fluorescence quenching Dissolved oxygen Fluoropolymers Sensor
CLC: TP212.2
Type: Master's thesis
Year: 2005
Downloads: 299
Quote: 2
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Abstract


Determination of dissolved oxygen in the field of industry analysis, biology, medicine, environmental monitoring is of great significance. In recent years has been a lot of reports on dissolved oxygen measuring device. Fiber optic oxygen sensor due to the intrinsically safe, high sensitivity, response time is faster, immune to electromagnetic interference advantages, their research has been of much concern. In this paper, ruthenium (II) - 30 -4,7 - diphenyl-1 ,10 - the phenanthroline dodecyl sulfonate compounds (Ru (dpp) 3 DS 2 < / sub>) as a fluorescent indicator, a styrene (Styrene) and methyl acrylate of tetrafluoroethane, propyl (TFPM) copolymer as the matrix to prepare the oxygen sensing membrane, and Add tributyl phosphate as a plasticizer, modified sensing membrane performance. The oxygen sensing film and return optical fiber coupled with the commercialization of the LED light source and a miniature CCD detector, developed a fiber-optic oxygen sensor based on fluorescence quenching principle. The content of this paper consists of four parts: the first chapter of the thesis for the literature review. A summary of several methods of measuring the oxygen concentration, and oxygen sensor development status comments, a detailed introduction of fiber optic chemical sensor and summarizes the types of fiber optic oxygen sensor indicator and matrix. Finally, the significance of this research project, the purpose and the main content of the research. The second chapter is the detection principle and design of fiber-optic oxygen sensor. Fluorescence quenching mechanism as well as the design of fiber-optic oxygen sensor. Chapter tetrafluoropropyl acrylate copolymer of styrene and methyl methacrylate as the matrix of the oxygen sensing membrane preparation. The chapter propyl ester copolymer of styrene and methyl methacrylate tetrafluorodichloroethane matrix, tributyl phosphate plasticizers, Ru (dpp) 3 DS 2 physical embedded in the matrix, to prepare the membrane of the oxygen sensor. Film-forming formulations by adjusting the sensing film, the best response of the dissolved oxygen sensor film. The fourth chapter is a study of the application of fiber-optic oxygen sensor. This chapter examines the analysis of characteristics of the fiber optic oxygen sensor response characteristics, stability and anti-jamming capability. For dissolved oxygen, its response time is less than 85s, the detection limit of 0.2 mg / l, reversibility, and good light stability, and is not a common impurity ion interference pH, salinity, and seawater. The sensor measured the dissolved oxygen concentration in the seawater samples, Dissolved Oxygen measurements with traditional methods - no significant difference between the iodometric method, the measurement error of less than 4%, the description of the sensor can be used for online monitoring of seawater.

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation components,parts > Transmitter ( converter),the sensor > Chemical sensors
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