Fiber & ElectroOptics Research Center (FEORC)
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Scholarly Works, Fiber & ElectroOptics Research Center (FEORC) [18]
Research articles, presentations, and other scholarship
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Microbend loss fiber optic direction and amplitude sensors for underwater applications
(Acoustical Society of America, 1990-07-01)Dual purpose fiber optic microbend loss sensors have been developed for measurement of underwater acousticwave amplitudes and for detection of the direction of wave propagation. Three different construction schemes for ... -
Uniform component of index structure induced in Ge-SiO2 fibers by spatially modulated ultraviolet light
(AIP Publishing, 1998-06-01)Experimental data are presented to show that Ge(1) and Ge(2) centers are induced by trapping photoinduced electrons from the conduction band, in agreement with our previous proposal that both are trapped electron centers. ... -
Structural origin of the 5.16-EV optical-absorption band in silica and GE-doped silica
(AIP Publishing, 1994-03-01)The origin of the 5.16 eV absorption band observed in silica and Ge-doped silica was studied using optical and electron spin resonance (ESR) measurements. The band was observed only in samples containing Ge, suggesting ... -
Stress-dependent growth kinetics of ultraviolet-induced refractive index change and defect centers in highly Ge-doped SiO2 core fibers
(AIP Publishing, 1999-10-01)The evolution of the index change of type-IIa gratings observed in 28 mol % Ge-SiO2 core fibers with 1.8 mu m core diameter under various strains was measured from the optical spectra, and the induced defects at high and ... -
Separation of Intrinsic and extrinsic Optical-Absorption in a Fluoride Glass
(AIP Publishing, 1991-07-01)The contribution of impurity ions to the total optical absorption of a heavy metal fluoride glass has been determined at 532 and 1064 nm. Four ZrF4-BaF2-LaF3-AlF3-NaF glasses were prepared from various purity raw materials. ... -
Layer-by-layer electrostatic self-assembly of nanoscale Fe3O4 particles and polyimide precursor on silicon and silica surfaces
(AIP Publishing, 1997-10-01)Monolayer and multilayer ultrathin films comprised of nanosized iron oxide (Fe3O4) particles and polyimide molecules have been fabricated on single crystal silicon and quartz substrates by a novel layer-by-layer electrostatic ... -
Dynamics of the 5-EV optical-absorption in SIO2 glass
(AIP Publishing, 1993-06-01)The optical absorption at 5 eV in SiO2 glass was observed, using laser calorimetry, to change reversibly depending on the intensity of UV light. The generation and bleaching of an absorption band at 5 eV by two- and ... -
Split-Spectrum Intensity-Based Optical Fiber Sensors For Measurement Of Microdisplacement, Strain, And Pressure
(Optical Society of America, 1996-08-01)A self-referencing technique compensating for fiber losses and source fluctuations in reflective air-gap intensity-based optical fiber sensors is described. A dielectric multilayer short-wave-pass filter is fabricated onto ... -
Sapphire Fibers: Optical Attenuation And Splicing Techniques
(Optical Society of America, 1995-12-01)The optical attenuation in sapphire fibers was examined. Attenuation was found to depend heavily on injection conditions. A number of techniques for making sapphire-silica fiber splices were attempted, with an effort toward ... -
Optical Scanning Extrinsic Fabry-Perot Interferometer For Absolute Microdisplacement Measurement
(Optical Society of America, 1997-02-01)We report an optical-scanning, dual-fiber, extrinsic Fabry-Perot interferometer system for absolute measurement of microdisplacement. The system involves two air-gapped Fabry-Perot cavities, formed by fiber end faces, ... -
Minimum Detectable Phase-Shift in Spectrum-Analysis Techniques Of Optical Interferometric Vibration Detection
(Optical Society of America, 1992-11-01)The minimum detectable phase shift indicated in recent experimental reports of new linear spectrum-analysis techniques of optical interferometric vibration detection is established as the direct consequence of the 1/f noise ... -
Miniaturized Fiber-Optic Michelson-Type Interferometric Sensors
(Optical Society of America, 1991-03-01)We present a novel, miniaturized Michelson-type fiber-optic interferometric sensor that is relatively insensitive to temperature drifts. A fused-biconical tapered coupler is cleaved immediately after the coupled length and ... -
Modeling Of Fiber-Optic Sensors Based on Micromechanical Vibrations in Liquid
(Optical Society of America, 1997-08-01)Fiber-optic chemical sensors based on optical power absorption or wavelength changes are well known. A new type of sensing element is considered. A micromechanical vibrated tiber-optic tip changes its resonance frequency ... -
Investigation And Application Of The Frustrated-Total-Internal-Reflection Phenomenon in Optical Fibers
(Optical Society of America, 1997-12-01)A detailed investigation of the frustrated-total-internal-reflection (FTIR) phenomenon in silica-glass-based optical fibers and its application to simple intensity-modulated strain and pressure sensors is presented. Such ... -
Fiberoptic Temperature Sensors Based on Differential Spectral Transmittance Reflectivity And Multiplexed Sensing Systems
(Optical Society of America, 1995-07-01)A concept for optical temperature sensing based on the differential spectral reflectivity/transmittance from a multilayer dielectric edge filter is described and demonstrated. Two wavelengths, lambda(1) and lambda(2), from ... -
Fabry-Perot Fiber-Optic Sensors in Full-Scale Fatigue Testing on an F-15 Aircraft
(Optical Society of America, 1992-02-01)We report results from fiber-optic-sensor field tests on an F-15 aircraft mounted within a full-scale test frame for the purpose of fatigue testing. Strain sensitivities of the order of 0.01 _m/m have been obtained. -
Effect Of External Index Of Refraction on Multimode Fiber Couplers
(Optical Society of America, 1995)The dependence of the performance of fused-taper multimode fiber couplers on the refractive index of the material surrounding the taper region has been investigated both theoretically and experimentally. It has been ... -
Characterization And Modeling Of Drift Noise in Fourier Transform Spectroscopy: Implications For Signal Processing And Detection Limits
(Optical Society of America, 1997-05-01)A theoretical analysis of long-term drift noise in Fourier transform spectroscopy is presented. Theoretical predictions are confirmed by experiment. Fractional Brownian motion is employed as a stochastic process model for ...
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