Point spread function reconstruction for next generation adaptive optics systems
Başlık çevirisi mevcut değil.
- Tez No: 400012
- Danışmanlar: DR. COLIN BRADLEY
- Tez Türü: Doktora
- Konular: Makine Mühendisliği, Mechanical Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2008
- Dil: İngilizce
- Üniversite: Unıversıty Of Vıctorıa
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: Belirtilmemiş.
Özet
Özet yok.
Özet (Çeviri)
In adaptive optics (AO) applications, point spread function (PSF) is defined as theimpulse response of the system, and the PSF reconstruction is used in calibrating imageanalysis techniques for astrometry and in the deconvolution of images to enhance theircontrast. The partial correction provided by the AO systems is due to the finite samplingof the wavefront sensor (WFS), the deformable mirror (DM) and the finite bandwidth ofthe overall system. This partial correction is mainly due to the high spatial frequenciesintroduced by the atmospheric turbulence, which translates into a halo artifact on thePSF. Furthermore, the correction provided by the AO system in direction of target objectsdegrades at greater angular distances from the guide star. This is called anisoplanatism.Consequently, the dimmer details of the AO images may not be detectable. One possibleway to counteract this halo effect is through PSF reconstruction. In order to achieveaccurate results, the analysis of the AO corrected images must account for the PSFtemporal variation. The most promising and reliable technique to achieve PSFreconstruction is to use the wavefront sensor data measured synchronously with theobservation (AO exposure).With the off-axis PSF reconstruction from a dual DM AO system as a generalobjective, a model based experimental evaluation of PSF reconstruction from classicalAO systems has been performed. Building on the success from on-axis classical AOsystems, the complexity of the model and the experimental set-up has been graduallyincreased to a multi DM AO system and a methodology has been proposed. The goodagreements between the numerical and experimental evaluation of the reconstructed PSFcomparisons ensured the successful implementation of the methodology. Last, thecomplexity of the analysis and of the model is further extended from a single light sourceto a multi-light source scheme, and the off-axis PSF reconstruction is achieved from adual DM AO scheme in order to accommodate for the anisoplanatic errors.One of the challenges in interpreting PSF over wide fields arises from the temporaland field-dependent evolution of the adaptive optics PSF. The methodologies describedin this thesis allow a quantitative analysis of wide-field observations that can account forthese effects. The outcome of this research is important for post-processing of imagesobtained by next generation AO systems. Although the results are unique to the UVicexperimental AO bench, the proposed PSF reconstruction methodologies will beapplicable to other dual DM systems and to multi DM AO systems. More precisely, theimportance of this thesis is to offer a PSF reconstruction technique for the adaptive opticsinstruments for the Thirty Meter Telescope (TMT). Once operational in 2016, TMT willbe the first extremely large ground based optical telescope. It will have a primary mirrordiameter of 30 m.
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