Astronomy and Astrophysics – Astrophysics – Instrumentation and Methods for Astrophysics
Scientific paper
2011-09-14
Proc. SPIE Volume 8151, 8151-10 (2011)
Astronomy and Astrophysics
Astrophysics
Instrumentation and Methods for Astrophysics
17 pages, 10 figures, proceedings of the Optics+Photonics SPIE conference, San Diego, 2011
Scientific paper
Stabilizing a nulling interferometer at a nanometric level is the key issue to obtain deep null depths. The PERSEE breadboard has been designed to study and optimize the operation of a cophased nulling bench in the most realistic disturbing environment of a space mission. This presentation focuses on the current results of the PERSEE bench. In terms of metrology, we cophased at 0.33 nm rms for the piston and 80 mas rms for the tip/tilt (0.14% of the Airy disk). A Linear Quadratic Gaussian (LQG) control coupled with an unsupervised vibration identi?cation allows us to maintain that level of correction, even with characteristic vibrations of nulling interferometry space missions. These performances, with an accurate design and alignment of the bench, currently lead to a polychromatic unpolarised null depth of 8.9E-6 stabilized at 3E-7 on the [1.65-2.45] \mum spectral band (37% bandwidth).
Barillot Marc
Buey Tristan
Cassaing Frédéric
Coudé du Foresto Vincent
Girard Paul
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