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 21 for “"spectral filtering"”.
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Evaluation of spatial-spectral filtering in non-paraxial volume holographic imaging systems
… volume phase holograms as spatial-spectral filters in optical systems for microscopic medical imaging are evaluated. In experiment, the relationship between the angle of incidence and diffraction efficiency are invesitgated for wavelength-detuned multiplex holograms to establish the …
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Long-term analysis of a small-scale concentrated photovoltaic-thermal system with a nanoparticle-based optical filter
… and absorb heat from sunlight. Although spectral filtering CPV-T systems have been explored in the literature for power generation, they have not been investigated for domestic applications. In this work, dynamic simulations of a small-scale spectral filtering CPV-T system under the …
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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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Unrolling of Graph Total Variation for Image Denoising
… a hybrid design that combines graph signal filtering with feature learning is proposed. It utilizes interpretable analytical low-pass graph filters and employs 80\% fewer parameters than a state-of-the-art DL denoising scheme called DnCNN. Specifically, to construct a graph for graph …
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Fiber-taper collected photoluminescence characterization of diamond microdisks
… as Q ∼ 1 × 105, are observed for the first time. Spectral filtering effects of the taper on the microdisk are analysed to reveal that coupling to these disks may be limited by phase matching requirements. By thinning these disks it should be possible to improve coupling while lowering mode …
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Polarization-dependent wavelength-selective structures for multispectral polarimetric infrared imaging
The need for compact, rugged, low-cost multispectral-polarimetric filtering technology exists in both the civilian and defense communities. Such technology can be used for object detection, object recognition, and image contrast enhancement. Mosaicked multispectral-polarimetric filter technology, …
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The Motional Stark Effect diagnostic on Alcator C-Mod
… relative to the local fields. Through careful spectral filtering, MSE measures the polarization angle of select multiplet components using a photoelastic modulator based polarimeter. Investigation of hydrogenic Balmer-[alpha] transitions in crossed E and B fields typical of MSE has led to the …
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On the Use of Arnoldi and Golub-Kahan Bases to Solve Nonsymmetric Ill-Posed Inverse Problems
… contaminated. Regularization methods such as spectral filtering methods use the singular value decomposition (SVD) and are effective at filtering inverted noise from solutions, but are computationally prohibitive on large problems. Hybrid methods apply regularization techniques to the smaller …
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Tests of a Functional Account of the Abney Effect
… to a fixed property of the stimulus like the spectral peak, possibly reflecting a compensation for the spectral filtering effects of the eye. Here we test this account more completely by comparing constant hue loci across a wide range of wavelengths and between the fovea and periphery. Purity …
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Multiphoton correlations and emitters
… probabilities are computed without and with spectral filtering, making emphasis on how the kind of filter affects the detection. Then, the full structure of the bundle is completely captured by the probability functions of the emission time of the individual photons. The results are …
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Enhancing the Data, Information and Knowledge from Proteomics Experiments through Biomedical Informatics
… strategy for ratio determination based on power spectral filtering and Levenberg-Marquardt fitting has been developed and is discussed here. This strategy is then applied here for several studies investigating a variety of topics, including: traumatic brain injury, Alzheimer’s disease and …
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Dark solitons in optical communication systems
… is shown to result in the exponential growth of spectral sidebands. This may be suppressed by reducing the periodicity of the loss/gain cycle or using periodic filtering. A general study of the response of dark solitons to spectral filtering is undertaken, showing dramatic differences in the …
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Speech enhancement using multisensory cooperative computing
… is proposed. ISM combines morphological and spectral filtering for robust speech separation. A transfer-learning fusion framework maps visual lip movements to speech representations with enhanced temporal modelling. Nonlinear transfer functions and a multi-objective loss incorporating mutual …
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Tunable Linear and Nonlinear Metasurfaces Based on Hybrid Gold-Graphene Plasmons
… the polarization state, beam steering, lensing, spectral filtering, and holography, to name a few. Metasurfaces can also facilitate nonlinear optical effects, such as the mixing of beams at different frequencies to generate a beam at a new frequency.</p> <p>The ability to alter the behavior of a …
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Multiscale environmental flow dynamics: particle settling, turbulence modulation, and tornadic vortices
… viscoelasticity and thixotropy provide passive spectral filtering of near‑wall turbulence. Building on these insights, the third study constitutes a first step toward coupling particulate matter with tornado‑like vortices. A customized vortex simulator demonstrates that vortex structure, …
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Pure sources and efficient detectors for optical quantum information processing
… pure heralded single photons with little or no spectral filtering, allowing a significant rate enhancement. Our work on detectors is based on the need to reliably measure single-photon states. We have focused on optimizing the detection efficiency of visible light photon counters (VLPCs), a …
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Convergence of Kernel Methods for Modeling and Estimation of Dynamical Systems
… the factors that affect the error, including the spectral filtering, the number of samples, and the accumulation of integration error.
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Improved broadband adaptive beamformer performance
… be used to suppress interference by spatial and spectral filtering of the signals received by an array antenna. The hardware requirements of adaptive Beamforming systems are high in comparison to other approaches. As a result, the total number of adaptable weights realisable in the beamformer may …
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Real-time characterization of transient dynamics in thulium-doped mode-locked fiber laser
… consecutive recordings of the pulse-to-pulse spectral evolution of a femtosecond pulse train, opening a whole new world of nonlinear dynamics in MLL. In this dissertation, we first demonstrate the ability of scaling the repetition rate of a Tm MLL to repetition rate as high as 1.25 GHz through …
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Electronic scan weather radar: scan strategy and signal processing for volume targets
… used in PAWR requires a new ground clutter filtering method. The filter is designed to work with a signal covariance matrix in the time domain. The matrix size is set to match the data block size. The filter's design helps overcome limitations of spectral filtering methods and make efficient …
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