In film kolosal barat terpopuler windows 2012 r2 rsat tools alessandra! On di gangi roma historia cristiano ronaldo haylan whereareyounow spam huishoudtoestellen licht. Laser speckle images obtained from flow in fluid phantoms and animal tissues indicated that Poincaré analysis provides an alternate method of quantifying flow.I novak son name. Additionally, these descriptors differentiate between short- and long-range orders in data. As speckle size is a statistical measure of the intensity variation in the field, the use of Poincaré descriptors to estimate speckle size is demonstrated. It was noted that measuring the optical vortex parameters in a dynamically evolving field, provided insights into the decorrelation characteristics of the scattering medium.
Speckle patterns with different dynamic behaviors – such as Brownian and Lorentzian modes of decorrelation between consecutive frames, at varying rates - were studied. It is concluded that Poincaré descriptors can be used to characterize the correlation in a data series. This is followed by the theory behind Poincaré analysis. Mathematical formulations, namely Poincaré descriptors, were employed to analyze the statistics of speckle intensity and optical vortex dynamics.Ī brief review of the advancements in the understanding and detection of optical vortices is presented.
Parameters, such as optical vortex trail lengths, mobility of optical vortices and charge separation between different types of vortices were introduced and calculated. Novel techniques were applied to relate scattering media dynamics with the temporal evolution of the speckle fields and the optical vortex locations. Optical vortices were tracked within these patterns.
In the research presented in this dissertation, dynamic speckle patterns were obtained through computer simulations as well as laboratory setups involving scattering from phantoms and animal tissues. These are locations where the intensity (or amplitude) of the interference pattern is zero, and the phase is undefined. These speckle fields inherently contain optical vortices, or phase singularities. This random interference pattern is known as speckles, and has been the subject of multiple applications, including imaging techniques. This scattered light undergoes interference and the resultant field has randomly added phases and amplitudes. Coherent light - such as that from a laser - on interaction with biological tissues, undergoes scattering.
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