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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 68 for “"Scattered light"”.
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COHERENT DETECTION OF SCATTERED LIGHT BY SUBMICROMETER AEROSOLS.
… measured. COPS uses the coherent nature of light available in a laser beam to measure the phase shift in the scattered light, which is fundamentally different from previous intensity based techniques. The Van-Cittert-Zernike theorem shows that scattered light from small particles will be …
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Investigations of the coherence properties of scattered light.
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Physics, 1971
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An Application of Scattered Light Photoelasticity to Dynamic Stress Analysis
Made available in DSpace on 2014-12-10T17:25:39Z (GMT). No. of bitstreams: 1 6711863.pdf: 1782661 bytes, checksum: 45f956d1b7b99f7ccf6cd80f8647b2da (MD5) Previous issue date: 1967
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Understanding disability glare: the effects of scattered light on visual performance
The focus of this thesis is on how light is scattered on its passage through the optics of the human eye, and the consequences for visual performance under different lighting conditions. A number of visual psychophysical measurement techniques were employed to investigate the impact of light …
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A Sequentially Modulated Ruby Laser System for Transmitted and Scattered Light Dynamic Photoelasticity
Made available in DSpace on 2014-12-10T17:25:42Z (GMT). No. of bitstreams: 1 6808208.pdf: 3987782 bytes, checksum: b1b2dca733b57d2d43829cf85d16c453 (MD5) Previous issue date: 1967
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Comparative Study of Forward and Diffusely Scattered Light in a Coherently Prepared Ultracold Rubidium Gas
<p>A comparison between forward and diffusely scattered light propagating in a coherently prepared ultracold <sup>87</sup>Rb atomic vapor is presented. This research is part of the ongoing effort to characterize the processes, such as diffusion, that contribute to coherence loss in atomic media …
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Emergence of Collective Light Scattering in Atomic <sup>87</sup>Rb Samples
… We report investigation of near-resonance light scattering from a cold atomic sample of 87Rb. Initially prepared in a magneto-optical trap, the atoms are loaded into a far-off-resonance optical dipole trap (FORT) in which the ensemble has a temperature near 100 mK and initial Gaussian radii …
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Filtered Rayleigh Scattering with an Application to Force Component Decomposition
… technique that makes use of the scattering of light off particles that are much smaller than the wavelength of light that hits them (i.e., Rayleigh scattering of air molecules). The scattered laser light is altered after encountering particles in predictable ways that can be related to changes …
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Building a better flat-field : an instrumental calibration projector for the Large Synoptic Survey Telescope
… but report systematic errors due to stray and scattered light from the flat-field screens used. The LSST calibration scheme replaces the traditional Lambertian-scattering flat-field screen with an array of projectors whose light is constrained in angle, thereby minimizing scattered light …
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Spontaneous brillouin scattering quench diagnostics for large superconducting magnets
… the frequency shift of spontaneous Brillouin scattered light was measured using heterodyne detection. A pulsed laser was used to probe the fiber using Optical Time Domain Reflectometry (OTDR) to define the spatial resolution. The spontaneous Brillouin frequency shift and linewidth as a …
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Absorption of sunlight by atmospheric sodium
… has been built which is sensitive only to light in a very narrow spectral region near the sodium D-line8. The light is scattered by sodium vapour at low density and the scattered light recorded by a photoelectric spectrometer. The latter resolves the two lines and allows the effect of stray …
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The application of laser measurement techniques to the pneumatic transport of fine particles
… for gas and liquid flows. In these situations, light from a low powered laser is scattered by seeding particles in the fluid which are small enough to follow the flow. The resulting Doppler shift of the scattered light is proportionate to the velocity of the particles and hence, to the velocity …
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Stimulated Brillouin scattering in an on-chip microdisk resonator
Brillouin scattering is the scattering of light from sound waves in a medium. There are three waves involved in the process: two optical waves (pump and scattered light) and one acoustic wave, and the scattering process is restricted through the conservation of momentum and energy. Stimulated …
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Computational imaging with scattered photons to see inside the body
… we develop computational frameworks to exploit scattered photons to image regions that are not directly visible to the camera. First, we will explore a new framework to model volumetric scattering with time-of- flight imaging to recover objects in scattering media with less need for …
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Next generation CAT system
… is a singleshot method to differentiate unscattered and scattered components of light transmission through a scattering material. Directly-transmitted components travel in a straight line from the light source, while scattered components originate from multiple scattering centers in the …
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Volumetric Optical Imaging of Tissue Microstructure for Grading of Dysplasia In Vivo
… of OCT images is generally qualitative, the scattered light intensity signal underlying these images may be analyzed further to calculate sub-resolution sample properties, accessing additional functional information in tissue. Developing meaningful ways to compute and interpret these …
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Determination of the relation between the particle size of viscose and the physical properties of the rayon produced: development of a practical method for measuring the change of particle size
… of the change in the intensity of the Tyndall light scattered by the solution. The intensity of the scattered light decreases rapidly at first, but more slowly with time, apparently approaching a limiting minimum value. The point at which the intensity measurements become practically constant …
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Optical Cerebral Blood Flow Monitoring of Mice to Men
… (DCS). DOS and DCS both employ near-infrared light to investigate tissue physiology millimeters to centimeters below the tissue surface. DOS is a static technique that analyzes multispectral tissue-scattered light intensity signals with a photon diffusion approach (Chapter 2) or a Modified …
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Localisation faible de la lumière dans un gaz d´atomes froids
… observed in coherent backscattering (CBS) of light by cold atoms is drastically reduced with respect to classical disordered media. In the present theoretical contribution, we study the impact of the degeneracy of the atomic dipole transition on weak localisation of light. The non-scalar …
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