The Fabrication Of Microstructured Polymeroptical Fiber And Its Applied Fundamental Studies

Microstructured optical fiber (MOF) has become an important part in fiber field forits unique structure characteristics and optical properties. The characteristics offlexibleness and easy process etc. of microstructured polymer optical fiber (MPOF) arealso an active research focus. In this thesis, we have explored and studied a series of thefabrication technology of MPOF, the modification of the holes, the filling of the holesand the application of MPOF, especially its application as imaging-transmitting andchemical sensing medium.The development history of optical fiber technology, the current status ofdevelopments of MOF, the technology of fiber imaging, and the current status ofdevelopments and research of optical fiber chemical sensor are briefly introduced in thefirst chapter. Based on this introduction, this thesis’characteristics and significance areproposed.In the second chapter, the fabrication methods of MPOF was introduced andcompared, based on which the excuding-moulding method is proposed for fabrication oflarge-sized preforms. The study is made on the tehchnics of fabricating large-sizedMPOF performs and the required conditions (temperature, the rate of delivering perform,drawing speed) how to fabricate a well regular MPOF.In the third chapter, the imaging capabilities of home-made MPOF with525holesrectangular array and547holes hexagonal array as air-core-array fiber are investigated.Then the liquid core array MOF which has imaging capabilities is fabricated byinjecting the high refractive index liquid into the array holes of MOF. The experimentsdemonstrate that the self of MOF and liquid core MOF have the imaging capabilities.Especially the liquid core array MOF that we make is firstly reported in the world andbreaks the history of liquid core fiber without the abilities of imaging.In the fourth chapter, a fiber optical probe with function of imaging is firstly prepared. Namely, a gradient index (GRIN) lens rod which was modified by pHsensitive film is connected with a polymer imaging fiber. By connecting the other endface of imaging fiber, Laser, CCD camera, improved metallographic microscope andspectrometer, a demo system of bifunctional optical sensor with imaging capabilities isprepared. On the one hand, the technique overcomes the difficulties that the traditionalpH meter is difficult for remote detection and can not detect in organism. On the otherhand, it overcomes the difficulties that the large sample can not brought to themicroscope stage when fine observing. Moreover, it can provide real-time imagingwhen pH sensing in organism. The corrosion behavior of iron was successfullyinvestivated by employing this sensor. The experiments demonstrated that in pH2.0buffer solutions, the pH value of the iron surface was about0.2pH unit higher than thatof the buffer solutions, the pH value of screw with thick rust cladding about0.65pHunit higher than that of the buffer solutions. In the pH2.9buffer solutions, the pHvalues of iron surface and rust surface were approximately0.16and0.9pH unit higherthan that of buffer solutions, respectively.In the fifth chapter, based on the tester assembled in fourth chapter, a new ideaabout Zn(II) sensor was proposed. A novel fluorescent sensor for Zn(II) detection isdeveloped by incorporating1-(2-pyridylazo)-2-naphthol (PAN) and Rhodamine B (RB)instead of expensive zinc ion sensitive fluorescent dye in a sol–gel film. Anothertechnical difficulty is the preparation of sensing film. The common film such ascellulose film and traditional acid catalyzed sol-gel is not suitable for immobilizing Zincion indicators. The base catalyzed sol was prepared, with the addition of two couplingreagents for improving the adherence of the sensing film with glass, and more suitablefor zinc ion detection. The sensor has the linear range of Zn(II) from0.1to1mmol/L.Simultaneously, it has the capabilities of real-time imaging with the whole system’sresolution of18.73line pairs/mm.In the sixth chapter, a novel carbon dioxide sensor of MPOF is designed. A MOFwith547holes is firstly employed as the substrate of carbon dioxide sensor. The inner surface of MOF is modified by sensing film of ethyl cellulose embedding ion pair ofphenol red and hexadecyltrimethylammonium hydroxide. In this sensor, the fiber on theone hand has the role of light transmission; On the other hand, the MOF is thetransmission channel of gases and reaction chamber for the detection of carbon dioxideconcentration through the cholor changes of ion pair. The structure of this sensor makeitself minimal and compact with big sensing acreage. Besides, this sensor can inhalegases by automatic and manual operation which makes it agiler. The investigation of thesensor’s response capabilities demonstrates that the sensor has steady performance andwell repetition.In the seventh chapter, a conclusion is made about the word during the studies ofPh.D. candidate, and the developments in the future is proposed.