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Showing 1 to 20 of 26 for “"reflectometer"”.
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Resolution and Coherence Length at a Pulsed Neutron Reflectometer
Made available in DSpace on 2017-07-06T18:55:28Z (GMT). No. of bitstreams: 3 Munter_Alan_E_MS.pdf: 40474809 bytes, checksum: f2e28c39fc5abcce0b18692a47c9824b (MD5) Munter_Alan_E_MS_ABS.pdf: 1029800 bytes, checksum: e2d468ba1ac6fcf8ef50b822d99e2b5f (MD5) license.txt: 4813 bytes, checksum: …
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Design, fabrication and application of a dedicated thick-film hybrid time domain reflectometer
… a dedicated hybrid thick-film time domain reflectometer. The design process allows for variation of the pulse generator characteristics as well as the output impedance of the unit. The unit is fabricated using standard thick-film hybrid techniques while giving consideration to problems …
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Effects of RF power on SOL density profiles and RF coupling on the Alcator C-Mod tokamak
A 100-146GHz swept-frequency X-mode reflectometer constructed and installed at three poloidal locations adjacent to the lower hybrid (LH) launcher and one location adjacent to the new field aligned ion cyclotron range of frequencies (ICRF) antenna has been used to measure the scrape-off-layer (SOL) …
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Experimental application and numerical study of reflectometry in the Alcator C-Mod tokamak
The amplitude modulated ordinary-mode reflectometer in the Alcator C-Mod tokamak is used to study the quasi-coherent (QC) continuous edge fluctuations in enhanced Da (EDA) H-modes. Reflectometer data show that the QC fluctuations are localized near the center of the density pedestal. The radial …
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Material process monitoring with optical fiber sensors
… sensor combines the characteristics of a Fresnel reflectometer with those of the extrinsic Fabry-Perot interferometer. For monitoring cure, a broadband source is used so the output intensity of the sensor is amplitude-modulated as the refractive index of the composite is increased during the …
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Deterministic chaos in Alcator C-Mod edge turbulence
… processes [15]. Using readily available reflectometer data from Alcator C-Mod (C-Mod), analysis of C-Mod edge turbulence in Ohmic plasmas and Ion Cyclotron Range of Frequencies (ICRF) heated L-Mode plasmas shows that density fluctuations just inside or at the Last Closed Flux Surface …
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Acoustic pulse reflectometry for the measurement of musical wind instruments
… reflectometry, the operation of a practical reflectometer is described and measurements of input impulse response, bore profile and input impedance are investigated. In general, the experimentally measured input impulse response of a tubular object contains a DC offset which must be removed …
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Measurement of some radiative properties of solar absorber materials
… and a Laser-source Spectral Bidirectional Reflectometer (ii) measurements using the above apparatus on Solar selective absorber (Maxorb, Cusorb, Skysorb, Solarcoat- 100), non-selective absorber (Nextel, Solarcoat-50) and metal (Al, Cu and brass) samples. The emissometer incorporates liquid …
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Light-induced structural transition and reflectivity of a silica-gallium interface
A broadband optical reflectometer with built-in thermal sample control was developed to study the linear properties of planar silica-gallium interfaces in the continuous range from 450 nm to 1650 nm with increasing and decreasing temperature in the range 12 °C to 36 °C, across the solid to melt …
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Low frequency plasma waves at Mars
Mars Global Surveyor's magnetometer/electron reflectometer (MAG/ER) experiment has returned over eight years of observations of low frequency plasma waves produced in the interaction of the solar wind with the Martian ionosphere. Using the MAG/ER data, I identify the properties and physical origins …
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Bidirectional Reflectance Measurements of Low-Reflectivity Optical Coating Z302
… coating Aeroglaze® Z302. An automated goniometer reflectometer has been designed, fabricated and successfully used for performing the BRDF measurements of Z302 at visible and ultraviolet wavelengths and at both polarizations. The current contribution involves study of Z302 samples prepared at …
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Six-port wireless receiver architectures
… general review of six -port reflectometer theory and architectures is presented. Three six-port architectures suitable for MMIC realization are discussed. <br/><br/>A new broadband six-port direct conversion wireless receiver architecture is proposed, designed and …
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Humidity sensing by optically interfacing with spectrally absorptive materials
… 0.5 second. A two-wavelength optical time domain reflectometer (OTDR) has been developed and a four-sensor network has been built. The resolution of measurement on the network can be better than 4% RH, but because of noise in the OTDR the resolution value is dependent on averaging time in the …
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Distributed optical-fibre sensors for monitoring mechanical strain and disturbance
… on a novel coherent-optical time-domain reflectometer (C-OTDR). <br/><br/>The operation of the C-OTDR has been investigated theoretically, using various models to describe coherent scattering in the optical fibre. The assumptions used in the models were applied to a numerical simulation …
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Quality and Consumer Acceptance in Relation to Post-Harvest Browning of Cultivated Mushrooms
… Surface browning was measured using an EEL reflectometer. Percentage reflectance was correlated to subjective gradings (p<0.001) throughout experiments. The surface features of mushrooms were examined using a Scanning Electron Microscope (SEM). The SEM was not satisfactory for determining …
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Performance Quantification of Interlayer Systems in Flexible Pavements Using Finite Element Analysis, Instrument Response, and Non Destructive Testing
… penetrating radar (GPR) surveys and time domain reflectometer (TDR) validated the effectiveness of the geocomposite membrane in preventing water from infiltrating to the underneath layers. In pavement rehabilitation applications, based on finite element (FE) analysis, it was found that the …
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Optical low coherence reflectometery for morphological characterization of static and dynamic systems
… I describe and evaluate Optical Low Coherence Reflectometery (OLCR) for morphological characterization of static and dynamic scattering systems.OLCR is a white-light interferometric technique, developed in the mid-1980s to measure the amplitude and the signal loss due to discrete reflections …
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Deposition, Characterization, and Fabrication of a Zinc Oxide Piezoelectric Thin Film Microspeaker Using DC Reactive Sputtering
… spectrums obtained from a Filmetrics F20 reflectometer and were used to determine the film thickness, the optical constants, and the optical band gap of the ZnO thin films. Using a four-point probe, the as-sputtered ZnO films were found to be highly resistive and insulative, mainly due to …
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