Ionizing Radiation Resistance of Random Hole Optical Fiber for Nuclear Instrumentation and Control Applications

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dc.contributor.authorAlfeeli, Bassamen
dc.contributor.committeechairPickrell, Gary R.en
dc.contributor.committeememberWang, Anboen
dc.contributor.committeememberClark, David E.en
dc.contributor.departmentMaterials Science and Engineeringen
dc.date.accessioned2014-03-14T20:36:31Zen
dc.date.adate2009-06-03en
dc.date.available2014-03-14T20:36:31Zen
dc.date.issued2009-05-04en
dc.date.rdate2009-06-03en
dc.date.sdate2009-05-12en
dc.description.abstractRandom hole optical fibers (RHOF) offer advantages over other types of microstructured optical fibers (MOFs). They are inexpensive and easy-to-make when compared to the high cost of ordered hole MOFs. They also have unique characteristics since they contain open and closed holes. The open holes contain ambient air under normal conditions and the closed holes contain residual gases from the fabrication process at certain pressure. The objective of this research work was to investigate the radiation resistance of Random Hole Optical Fibers (RHOF) for possible use as both sensing element and data transmission medium in nuclear reactor instrumentation and control applications. This work is motivated by the demand for efficient, cost effective, and safe operation of nuclear power plants, which accounts for more than 14% of the world's electricity production. This work has studied the effect of gamma irradiation on RHOF fibers by comparing their performance to that of standard solid telecommunication fibers and commercially available specialty solid fiber designed to be radiations hardened fiber. The fibers were evaluated at different absorbed dose levels: 12 mGy(Si), 350 mGy(Si), and 7200 Gy(Si) by measuring their radiation induced absorption (RIA) on-line. In the low dose test, the maximum RIA measured in untreated RHOF was approximately 8 dB while the RIA in the untreated MMF fibers reached a maximum at about 28 dB. In the high dose test, the maximum RIA measured in untreated RHOF was 36 dB while RIA in the methanol washed RHOF was only 9 dB. RHOF also demonstrated superior radiation damage recovery time over all of the other fibers tested. Based on the experimental evaluations, it was deduced that RHOFs used in this work are resistant to gamma radiation. and recover from radiation damage at a faster rate compared to other fibers tested. The radiation induced absorption (RIA) at the 1550 nm window in the RHOF fibers could be attributed to the OH absorption band tail. However, the existence of other mechanisms responsible for RIA is also postulated. Some of these mechanisms include bulk and surface defects which are related to the fabrication process and the influence of the gases confined within the RHOF microstructure. Gamma radiation resistance of RHOFs can be attributed to the lack of dopants and also possibly the inherent OH and nitrogen content. The behavior of thermally annealed RHOF and their fast recovery is in favor of this hypothesis.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-05122009-145713en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-05122009-145713/en
dc.identifier.urihttp://hdl.handle.net/10919/32661en
dc.publisherVirginia Techen
dc.relation.haspartAlfeeli_Thesis_Final2.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectNuclear energyen
dc.subjectNuclear power generationen
dc.subjectMicrostructured optical fibersen
dc.subjectPhotonic crystalsen
dc.subjectOptical fiber fabricationen
dc.subjectOptical fiber sensorsen
dc.titleIonizing Radiation Resistance of Random Hole Optical Fiber for Nuclear Instrumentation and Control Applicationsen
dc.typeThesisen
thesis.degree.disciplineMaterials Science and Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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