Sensitivity of a ``dispersed-speckles'' piston sensor for multi-aperture interferometers and hypertelescopes

Details Sensitivity of a ``dispersed-speckles'' piston sensor for multi-aperture interferometers and hypertelescopes Sensitivity of a ``dispersed-speckles'' piston sensor for multi-aperture interferometers and hypertelescopes

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...429..747b&link_type=abstract

Astronomy and Astrophysics, v.429, p.747-753 (2005)

Astronomy and Astrophysics

Astrophysics

5

Turbulence, Techniques: Interferometric, Atmospheric Effects

Scientific paper

In multi-aperture interferometers and hypertelescopes, the piston errors can be determined from multi-spectral images of the speckle pattern using a 3-dimensional Fourier transform. We study the limiting magnitude of the method in the case of non-redundant apertures using analytical derivations and numerical simulations. We show specifically for the case of sub-r_0 apertures that a few photons per aperture within the full spectral bandwidth will suffice to measure piston errors. The method's sensitivity is thus comparable to that of the Shack-Hartmann and other methods used with monolithic apertures.

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