Translator Disclaimer
Paper
9 June 1994 Closure phase imaging with low-order adaptive optics
Author Affiliations +
Abstract
We examine the effects of low-order adaptive optics on the performance of closure-phase (nonredundant mask) imaging. In particular we investigate a system that uses a small number of plane tip-tilt correcting mirrors. These apply local adaptive corrections to the beams transmitted by a pupil plane mask, but do not correct for piston wave-front errors between the beams. We have identified the optimum sub-aperture size and science channel exposure time for a range of seeing conditions and light levels using numerical simulations. Our calculations predict improvements in the SNR of monochromatic power spectrum and bispectrum measurements by factors in the range 2-15 over their uncorrected values. For optical NRM imaging with large telescopes, this combination of sparse localized wavefront correction, rather than modal correction over the whole telescope aperture, is much more efficient in terms of maximizing the SNR improvement per adaptive degree-of-freedom. Such a zonal AO system represents a cost-effective strategy for extending the utility of closure phase imaging using a very small number of active optical components. Suitable astrophysical sources amenable to such an approach include evolved supergiant stars, long period variables, and other bright compact objects.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Christopher A. Haniff and Richard W. Wilson "Closure phase imaging with low-order adaptive optics", Proc. SPIE 2200, Amplitude and Intensity Spatial Interferometry II, (9 June 1994); https://doi.org/10.1117/12.177270
PROCEEDINGS
12 PAGES


SHARE
Advertisement
Advertisement
RELATED CONTENT

Wavefront control system for the Keck telescope
Proceedings of SPIE (September 11 1998)
Actuator requirements for laser power beaming
Proceedings of SPIE (May 01 1994)
A Near Infrared Astronomical Adaptive Optics System
Proceedings of SPIE (September 20 1989)
Filled aperture telescopes in the next millennium
Proceedings of SPIE (July 01 1990)
Adaptive Optics For The ESO-VLT
Proceedings of SPIE (April 13 1989)
Adaptive optics for the SALT
Proceedings of SPIE (July 15 2008)

Back to Top