Cross-spectrum Techniques Applied To Astronomical Speckle Interferometry

Claude Aime; Roumain G. Petrov; Francois Martin; Gilbert Ricort; Julien Borgnino

doi:10.1117/12.949556

25 November 1985 Cross-spectrum Techniques Applied To Astronomical Speckle Interferometry

Claude Aime, Roumain G. Petrov, Francois Martin, Gilbert Ricort, Julien Borgnino

Proceedings Volume 0556, Intl Conf on Speckle; (1985) https://doi.org/10.1117/12.949556
Event: 29th Annual Technical Symposium, 1985, San Diego, United States

Abstract

A cross spectrum analysis technique, which makes it possible to compute an unbiased estimate of the speckle pattern Wiener spectrum, has been developed at the Nice University Astrophysics Department. The technique is based upon the use of a dual channel experiment, each of the channels giving a record of the image intensity with its specific noise. A cross spectrum analysis between the two channels gives an estimate of the Wiener spectrum free of background noise bias. Using a one-dimensional interferometer, the technique has given results on several subjects such as the study of atmospheric MTF including anisotropies due to the geometry of the telescope aperture, the time-space properties of speckles, the angular structure of Betelgeuse and the convective motions of solar photospheric microstructures. The cross spectrum analysis technique has been applied also to the speckle spectroscopy technique and to the differential speckle interferometry technique. A theoretical study of the bichromatic cross spectrum has been elaborated and the first experimental results are shown, they are in good agreement with the theory. Expressions are given for the signal-to-noise ratio on the amplitude and the uncertainty on the phase of the cross-spectrum of two speckle images in the presence of photon shot noise. They are applied to the very promising differential speckle interferometry technique which already permitted us to measure angular micro-displacements, due to atmospheric dis-persion, into the submilliarcsecond range.

Citation Download Citation

Claude Aime, Roumain G. Petrov, Francois Martin, Gilbert Ricort, and Julien Borgnino "Cross-spectrum Techniques Applied To Astronomical Speckle Interferometry", Proc. SPIE 0556, Intl Conf on Speckle, (25 November 1985); https://doi.org/10.1117/12.949556

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available