Dissertation/ Thesis
Adaptive optics in speckle interferometry and in super-resolution ...
| العنوان: | Adaptive optics in speckle interferometry and in super-resolution ... |
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| المؤلفون: | Gundu, Phanindra Narayan |
| بيانات النشر: | Lausanne, EPFL |
| سنة النشر: | 2007 |
| المجموعة: | DataCite Metadata Store (German National Library of Science and Technology) |
| مصطلحات موضوعية: | DSPI, Correlation fringes, Adaptive optics, Deformation measurement, LCD, Morphological filtering, Pupil filter, Superresolution, Superspeckles, Decorrelation, Frange de corrélation, Optique adaptative, Mesures de déformation, Filtre morphologique, Filtre pupillaire, Décorrélation |
| الوصف: | This thesis describes innovative techniques for reducing speckle noise and improving the intensity profile of the speckle correlation fringes. The methods are based on reducing the range of the modulation intensity values of the speckle interference pattern. After the fringe pattern is corrected adaptively at each pixel, a simple morphological filtering of the fringes is sufficient to obtain smoothed fringes. The concepts are presented both analytically and by simulation by using computer-generated speckle patterns and experimental verifications are performed wherever possible. A new generalized method for designing continuous amplitude-only pupil filters for transverse superresolution using a nonlinear programming method is also presented. The thesis emphasises the principal advantage of amplitude-only filters over their phase-only counterparts, that the side lobe intensities can be highly reduced along with the spot size. A quantitative comparison with continuous phase-only filters as well as the two-zone ... |
| نوع الوثيقة: | thesis doctoral or postdoctoral thesis |
| اللغة: | English |
| DOI: | 10.5075/epfl-thesis-3873 |
| الاتاحة: | https://dx.doi.org/10.5075/epfl-thesis-3873 https://infoscience.epfl.ch/handle/20.500.14299/7885 |
| Rights: | restricted ; http://purl.org/coar/access_right/c_16ec |
| رقم الانضمام: | edsbas.8CC1B6A2 |
| قاعدة البيانات: | BASE |
| DOI: | 10.5075/epfl-thesis-3873 |
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