Issue |
Astron. Astrophys. Suppl. Ser.
Volume 121, Number 3, March 1997
|
|
---|---|---|
Page(s) | 553 - 568 | |
DOI | https://doi.org/10.1051/aas:1997323 | |
Published online | 15 March 1997 |
Correction of the “piston effect” in optical astronomical interferometry
I. Modulus and phase gradient of the visibility function restoration
Observatoire de Paris, DESPA, 5 place Jules Janssen, F-92195 Meudon, France
Send offprint request to: G. Perrin
Received:
13
November
1995
Accepted:
7
November
1996
An a posteriori method to cancel out atmospheric optical path fluctuations to
achieve accurate phase restoration and spectral analysis of interferograms is
presented in this paper. The correction algorithm is based on classical noise
reduction methods. The consequence of piston noise is twofold: 1) loss of
spectral information; 2) loss of visibility phase. A method to measure the
modulus and the phase gradient of visibilities is explained and examples of
restoration of simulated spectra and visibilities for various ratios are
presented.
Key words: atmospheric effects / methods: data analysis / technics: interferometric
© European Southern Observatory (ESO), 1997