Misalignment Sensing for Optical Aperture Synthesis Telescope Using Phase Diversity

Details Misalignment Sensing for Optical Aperture Synthesis Telescope Using Phase Diversity Misalignment Sensing for Optical Aperture Synthesis Telescope Using Phase Diversity

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008pnaoc...5..288c&link_type=abstract

Astronomical Research and Technology. Publications of National Astronomical Observatories of China (ISSN 1672-7673), Vol. 5, No.

Astronomy and Astrophysics

Astronomy

Optical Aperture Synthesis Telescope, Piston Error, Phase Diversity, Wavefront Sensing

Scientific paper

An optical aperture synthesis telescope such as the Multi-Mirror Telescope will suffer from phase errors unless the segments are aligned to within a small fraction of a wavelength. As an optical misalignment sensing technique, phase diversity can estimate the pupil phase from pairs of simultaneously recorded focused and defocused images, then the misalignment error is obtained. The image-forming system has been simulated by computer, and the unknown wavefront has been estimated by using the method of finite differences. Simulation results show phase-diversity method can accurately retrieve the wavefront, and sense misalignment error.

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