Statistics – Applications
Scientific paper
May 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003phdt........17m&link_type=abstract
PhD Thesis, TU Delft, 2003
Statistics
Applications
Interferometry, Nulling
Scientific paper
The main results of the work that is presented in this thesis are the following: Rejection ratio. We have given the most general expression for the rejection ratio, which can be applied on arbitrary amplitude- and phase distributions (Chapter 3). This means that it is more general than the previous and commonly used definition, which was only applicable on the Bracewell nulling interferometer. Amplitude and phase distribution. Previously, it was believed that high rejections of the stellar light could only be achieved if achromatic phase shifters were used. We have proposed a new amplitude and phase distribution and shown both theoretically and experimentally that it is less sensitive to phase shift errors (Chapters 3 and 6). As a consequence, the constraints on the phase shifter can be relaxed, which results in a simplification of the optical lay-out of a nulling interferometer. Phase shifters. We have shown numerically that delay lines and dispersive phase shifters consisting of one material can be used to achieve high rejections in broadband applications (Chapter 5). Furthermore, we have developed a glass map for the dispersive phase shifter from which the achromaticity of pairs of dispersive materials can be estimated.
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