Pathlength Stability of Synthetic Aperture Telescopes - the Case of the 25 cm CERGA Interferometer
- 1 January 1984
- journal article
- Published by Cambridge University Press (CUP) in International Astronomical Union Colloquium
- Vol. 79, 257-265
- https://doi.org/10.1017/s0252921100108449
Abstract
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.Keywords
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