CMDITR Review of Undergraduate Research - Pluto - University of ...

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Fiber drawing process 1. In the initial heating process, a preform with a diameter D p is lowered into the furnace at a velocity V p . 2. After the preform is heated, it necks down by its own weight (or with an applied tension) into a smaller diameter, ultimately exiting the bottom of the furnace. 3. The lower piece of preform is cut off, and the fiber is then put under a continuous applied tension, exiting the bottom of the furnace at diameter D f and velocity V f . Once the system has reached steady state conditions, it is possible to change two variables to control the fiber diameter. Namely, these two variables are the speed at which the preform is lowered into the furnace, and the speed at which the fiber exists. Since the cross-sectional area of the preform and fiber differs, the speed at which they enter and exit also differs. The relationship between the preform entering and fiber exiting can be described as (when the system is in steady state): where ρ is the density of the preform – assumed to be constant in this process. The preform doped at 1 wt % pyrene was drawn after being dried in a Marshall furnace, kept at 90ºC, for two weeks. Due to time constraints, however, the preform was drawn without any cladding. Conclusion The oscillations in diameter (Figure 6) represent air bubbles that were formed when the preform was heated. The bubbles are an indication that the preform was not dried fully, and that preforms under this process require more time in the preheating furnace. The steady diameter trend shows that the new polymerization process works and creates preforms with good material properties and stronger control over diameter variation. 10 CMDITR Review of Undergraduate Research Vol. 1 No. 1 Summer 2004
Acknowledgements Brian Ratliff, Graduate Student, Mechanical Engineering, University of Washington Dr. Ann M. Mescher, Associate Professor, Mechanical Engineering, University of Washington. McGrath Group, University of Arizona. References 1. Kobayashi, T., W.J. Blau, H. Tillman and H. Hans-Heinrich. 2003. Light amplification and lasing in doped polymer optical fibers. Proceedings of the SPIE – The International Society of Optical Engineering. 4876:330- 337 2. Dyneon, A. 2004. 3M Company. http://www.dyneon.com. 3. Dixon, J. 2001. Master’s Thesis. University of Washington, Seattle, WA. 4. Peng, G. D., P.L. Chu, Z. Xiong, T.W. Whitbread and R.P. Chaplin, 1996. Dyedoped step-index polymer optical fiber for broadband optical amplification. Journal of Lightwave Technology. 14:2215-2223 CMDITR Review of Undergraduate Research Vol. 1 No. 1 Summer 2004 11
Page 1 and 2: CMDITR Review of Undergraduate Rese
Page 3 and 4: Welcome to the premier issue of the
Page 5 and 6: Extended Abstracts Table of Content
Page 7 and 8: wt % THV 220A). The glass tube was
Page 9: Fiber cladding preparation In order
Page 13 and 14: Figure 2. Synthesis of the dendrime
Page 15 and 16: Toward the Synthesis of a Magnetic
Page 17 and 18: Results and Discussion Synthesis of
Page 19 and 20: years, (13) decomposes into a yello
Page 21 and 22: References 1. (a) MacDiarmid, A.G.
Page 23 and 24: suggests that any effects of these
Page 25 and 26: Electrospinning of Piezoelectric Ma
Page 27 and 28: varies and is close to the critical
Page 29 and 30: Synthesis of Azaindoly-phenanthroli
Page 31 and 32: Experimental Physical Measurements.
Page 33 and 34: [60] fullerene enable close packing
Page 35 and 36: Crystallization. We attempted to cr
Page 37 and 38: number of solvents including aceton
Page 39 and 40: References 1. Dalton, L.R. 2003. No
Page 41 and 42: though the beads were moving becaus
Page 43 and 44: Feasibility of Hydroxy-Chalcone Lin
Page 45 and 46: absorbance is proportional to conce
Page 47 and 48: Results Linear Dichroism Metripol c
Page 49 and 50: Pararosaniline Xylene Cyanole FF Cr
Page 51 and 52: the source of the light emitted by
Page 53 and 54: Figure 6. UV and PL spectra of the
Page 55 and 56: Method The hybrid chromophore will
Page 57 and 58: Results The ligand was synthesized
Page 59 and 60: Following the cooling down, the pro
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Two-Photon Induced Free Radical Pol
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Future Work When the results of the
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