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Study Of Chalcogenide Glass Optimization And Chalcogenide Fiber Fabrication For Liquid Sensing System

Posted on:2015-07-27Degree:MasterType:Thesis
Country:ChinaCandidate:D M YinFull Text:PDF
GTID:2298330422493093Subject:Electronic and communication engineering
Abstract/Summary:PDF Full Text Request
Chalcogenide fibers have a wide range of infrared transmission, strong chemical stability andgood plasticity which can be tapered and used as a component of chalcogenide glass fiber sensorsfor in situ, long distance and real time monitoring in the field of liquid, gas, medicine and others. Itpossesses great application potential in monitoring of environment pollution, microbiologicalexperiment and early diagnosis of disease, so there is a long term practical significance to explorematrix materials and preparation technology of new mid and far-infrared chalcogenide fibers withperfect performance.In this thesis, the research process and related basic theories of selenium-telluriumchalcogenide glasses, infrared optical fibers and infrared chalcogenide fiber sensors were studied.Glass formation capacity, thermal stability, optical properties and structures of Ge-Se-Te-Snchalcogenide glass system were thoroughly researched for exploring new environmental friendlymaterials used in mid and far-infrared. Meanwhile, Ge20Sb15Se65chalcogenide glass was selectedas a matrix material for fiber drawing and preliminary experiment on fiber tapering was carried outby fused biconical taper method and chemical corroding method. Finally, an infrared transmissionspectrum of Se-based chalcogenide fiber was tested, which confirmed the feasibility ofchalcogenide fiber for infrared sensing.In chapter1, selenium-tellurium chalcogenide glasses were simply introduced on researchingdirection, application fields and development potential in mid-infrared during the research courseof more than40years. The research process of infrared fibers and their advantages for sensing wasdescribed briefly. The components of fibers, their infrared transmission range and diameter oftapered fiber as well as sensing application were explored in detail during the research process.Finally, the research significance, study difficulties and research contents put forward.In chapter2, it summarizes the theories of chalcogenide glasses in forming, structure, thermaland optical properties and so on. The theories of fiber inner total reflection and fiber losses weredescribed simply. The main point of this chapter was the overview of fiber evanescent wavespectroscopy (FEWS) history, principle and optical transmission theory inner tapered fibers whichcould enhance the sensitivity of optical fiber sensors. In chapter3, preparation technique of chalcogenide glasses, optical fibers and tapered fiberswere described and testing instruments for thermal and optical properties of glass samples andtransmission spectrum for fibers were introduced.In chapter4, it made an in-depth study on Ge-Se-Te-Sn chalcogenide glass systems, and theirforming ability, thermal characteristics and structures of glass were described in detailed. Thechanges of glass forming ability, thermal properties, and optical properties were analyzed andfurther explained by structured changes and Philips constraint theory.In chapter5, Ge20Sb15Se65chalcogenide glass was chosen as matrix material for fiber andtapered fiber. Chalcogenide fiber were drawn with special wire drawing machine under399℃, andthen the optical fiber were tapered through melting cone method and chemical etching method fora preliminary test. The tapered fiber diameter and surface was observed under the microscope.At the end of the thesis, research results were concluded, problems were pointed out andrelated improvement directions were given.
Keywords/Search Tags:Chalcogenide Glasses, Thermal Properties, Optical Properties, Ramanspectroscopy, Tapered Fiber
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