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Pathlength Stability of Synthetic Aperture Telescopes - the Case of the 25 cm CERGA Interferometer

Published online by Cambridge University Press:  12 April 2016

J.M. Mariotti  and
G.P. Di Benedetto
J.M. Mariotti
Affiliation:
Observatoire de Lyon F-69230 Saint Genis Laval Under E.S.A. grant at I.F.C. - Milano
G.P. Di Benedetto
Affiliation:
Istituto di Fisica Cosmica 1-20133 Milano

Extract

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Synthetic aperture telescopes are more and more considered as a promising scheme for the next generation of Very Large Telescopes : the basic idea is to combine the beams of two or more independent telescopes. The question immediately raising when considering such a technique is the pathlength stability and the amount of pathlength difference that can be tolerated, assuming a reasonable bandwidth, to preserve coherent addition of the wavefronts and hence, high spatial frequencies observations.

To that respect the I2T (two telescopes interferometer) in operation at CERGA constitutes a remarkable test-bench for studies of mechanical, optical and atmospheric constraints that are to be faced when dealing with amplitude interferometry between several telescopes.

Type
III. Atmospheric Seeing, Interferometry, Speckle, MMTs and Arrays
Information
International Astronomical Union Colloquium , Volume 79: Very Large Telescopes, their Instrumentation and Programs , 1984 , pp. 257 - 265
Copyright
Copyright © ESO 1984

References

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