Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 27 for “"High Spectral Resolution"”.
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Imaging X-ray spectroscopy with micro-X and Chandra
High spectral resolution observations of X-ray phenomena have the potential to uncover new physics. Currently, only point sources can be probed with high resolution spectra, using gratings. Extended objects like supernova remnants cannot be dispersed, leaving the dense forest of emission lines …
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Generation and characterization of spectrally factorable biphotons
Spectrally unentangled biphotons with high single-spatiotemporal-mode purity are highly desirable for many quantum information processing tasks. We generate biphotons with an inferred heralded-state spectral purity of 99%, the highest to date without any spectral filtering, by pulsed spontaneous …
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Assessing Satellite Image Data Fusion with Information Theory Metrics
… in remote sensing is estimating an image with high spatial and high spectral resolution given separate sources of measurements from satellite instruments, one having each of these desirable properties. This thesis presents a survey of seven families of algorithms which have been developed to …
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Energetic interactions within the solid-state spectrometer of the ASCA Satellite
… in which various instruments operate with high throughput and high spectral resolution. Detailed examination of the method in which photoelectronic interactions occur in the Charge Coupled Devices (CCDs) of the Solid-State Imaging Spectrometer (SIS) on ASCA reveals a sudden variation in the …
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Digital spectral analysis and adaptive processing techniques for phase modulated optical fiber sensors
… information from the fiber sensor. Classical spectral analysis utilizing the Fourier transform as a mathematical foundation for relating a time or space signal to its frequency-domain representation was shown to be inadequate for mitigating the bias errors caused by harmonic distortions. A …
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Material Related Effects on the Structural Thermal Optical Performance of a Thermally Tunable Narrowband Interferometric Spectral Filter
High Spectral Resolution Lidar (HSRL) is a backscatter lidar technique that employs an optical/spectral filter to distinguish between particulate (Mie) and molecular (Rayleigh) backscattered light. By separating the two types of returns, higher accuracy measurements are possible that will enable …
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On the Rayleigh -Brillouin scattering in air
<p>GroundWinds lidar system is a high-spectral-resolution lidar system that can directly measure the Rayleigh-Brillouin scattering (RBS) spectra, from which the wind, temperature, and turbulence in the troposphere can be measured. Its transmitter is a double-frequency Nd-YAG laser at 532nm. Most of …
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Atmospheric radiative transfer in multiple scattering conditions. Application to NWP models.
High spectral resolution radiative transfer (RT) codes are essential tools in the study of the radiative energy transfer in the Earth atmosphere and a support for the development of parameterizations for fast RT codes used in climate and weather prediction models. Cirrus clouds cover permanently …
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External cavity laser biosensor for label-free detection
… performance metrics for such sensors include high sensitivity and fine resolution, which are essential for achieving high-precision detection of small molecules. In this work, we demonstrate a dual-mode external cavity laser (ECL) biosensor to address the desired needs. The utilization of …
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A Doppler Radar Lock-in Demodulation Algorithm for Machine Vibration Sensing
… requires large amounts of data to achieve high spectral resolution necessary for fault detection especially with radio frequency sampling, which can be computationally too expensive for analysis. In this work, we propose to use a sweeping lock-in amplifier to achieve high frequency …
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Analysis of Multiresolution Data fusion Techniques
… of remote sensing imagery of varying resolution has increased, merging images of differing spatial resolution has become a significant operation in the field of digital remote sensing. This practice, known as data fusion, is designed to enhance the spatial resolution of multispectral …
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Fast and Accurate Image Feature Detection for On-The-Go Field Monitoring Through Precision Agriculture. Computer Predictive Modelling for Farm Image Detection and Classification with Convolution Neural Network (CNN)
… optic and radiometric sensor was used to obtain high spectral resolution images of plantation status during normal production/growth cycle. Then, an ensemble of classifiers with Convolution Neural Networks (CNN) was used as off the shelf feature extractor to train images to develop an end-to-end …
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An Arcminute-Resolution Imaging Study of the H-alpha & [S II] Emission of the ISM from the Local Perseus Arm Using the Virginia Tech Spectral-Line Survey
The Virginia Tech Spectral-Line Survey (VTSS) is a series of 10-degree wide, arcminute-resolution images of the warm ionized interstellar medium (WIM) within the Milky Way for declinations greater than -15 degrees. The Wisconsin Hydrogen-Alpha Mapper (WHAM) studies the kinematics and distribution …
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The Development of A Spatial Heterodyne Spectrometer For Raman Spectroscopy
… not require long focal length optics to achieve high spectral resolution, which makes the SHRS intrinsically small. The SHRS measures all wavelengths simultaneously and can be coupled with a pulsed laser source and gated detector for measurements in high ambient light conditions. The SHRS system …
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Intrinsic Spectroscopic Tumor Markers Revealed by Double-Differential Analysis of Near-Infrared Absorption Spectra
… The question we address is: are there unique spectral differences between the normal and tumor-containing breast tissues besides spectral differences resulting from tissue composition? To this end we have developed a new approach to spectral analysis of broadband near-infrared (NIR, …
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Hyperspectral Remote Sensing for UXO Detection and Damage Assessment on Airfield Pavements
… This research explores using near-surface hyperspectral sensors as an alternative to red, green, blue (RGB) digital cameras, in hopes of improving detection precision and accuracy for airfield assessment. However, even with modern hyperspectral sensors the benefit of increasing spectral image …
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Ultraviolet (UV) Laser Implementation, Signal Model, and Measurement Sensitivities in Filtered Rayleigh Scattering for Aerodynamic Flows
… levels, cesium vapor cell temperature, and spectral resolution are demonstrated. It is found that the best possible theoretical measurement results are obtained for high-speed wind tunnel flow conditions with high spectral resolution, and that the CRLB for velocity, static temperature, and …
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Ultra-high Field MRI Methods for Precise Anatomical and Spectroscopic Measurements in the Brain and Application to Neurological and Neuropsychiatric Diseases
… overall. However, limitations in contrast and resolution at clinical field strengths may hinder investigation of the underlying biological mechanisms of these diseases. Ultra-high field MRI scanners, such as those at 7-Tesla, can enhance biomarker detection because they provide superior …
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A Remote Observatory for Geocoronal Hydrogen Emissions
… a pressure-tuned dual-etalon FPI to allow for high spectral resolution (R_80,000) measurements, and several charge-coupled device (CCD) imagers for guiding and collecting data. The environment is fully monitored using temperature, humidity, barometric pressure, and wind sensors. The INSpIRe …
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Advanced Techniques for Automatic Change Detection in Multitemporal Hyperspectral Images
… the new generation remote sensing satellite hyperspectral images provides an important data source for Earth Observation (EO). Hyperspectral images are characterized by a very detailed spectral sampling (i.e., very high spectral resolution) over a wide spectral wavelength range. This important …
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