The differential tip-tilt sensor of SPHERE

Pierre Baudoz; Reinhold J. Dorn; Jean-Louis Lizon; Thierry Fusco; Kjetil Dohlen; Julien Charton; Jean-Luc Beuzit; Pascal Puget; David Mouillet; Markus Felt; Francois Wildi; Andrea Barrufolo; Markus Kasper; Norbert Hubin

doi:10.1117/12.858274

20 July 2010 The differential tip-tilt sensor of SPHERE

Pierre Baudoz, Reinhold J. Dorn, Jean-Louis Lizon, Thierry Fusco, Kjetil Dohlen, Julien Charton, Jean-Luc Beuzit, Pascal Puget, David Mouillet, Markus Felt, Francois Wildi, Andrea Barrufolo, Markus Kasper, Norbert Hubin

Author Affiliations +

Proceedings Volume 7735, Ground-based and Airborne Instrumentation for Astronomy III; 77355B (2010) https://doi.org/10.1117/12.858274
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

Abstract

The SPHERE instrument aims at detecting giant extrasolar planets in the vicinity of bright stars. Such a challenging goal requires the use of a high performance Adaptive Optics (AO) system, a coronagraphic device to cancel out the flux coming from the star itself, and smart focal plane techniques to calibrate residual uncorrected turbulent and/or static wavefronts. Inside the adaptive optic system, a specific tool is developed in SPHERE to ensure that the star is always well centered on the coronagraph. This tool called Differential Tip-Tilt Sensor (DTTS) measures the position of the star at the same wavelength than the science instruments. It is located very close to the focal plane to minimize drifts between DTTS and the coronagraph. After describing the DTTS, we will describe the tests and laboratory results on stability measurement of the DTTS; stability which is crucial for SPHERE performance.

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Pierre Baudoz, Reinhold J. Dorn, Jean-Louis Lizon, Thierry Fusco, Kjetil Dohlen, Julien Charton, Jean-Luc Beuzit, Pascal Puget, David Mouillet, Markus Felt, Francois Wildi, Andrea Barrufolo, Markus Kasper, and Norbert Hubin "The differential tip-tilt sensor of SPHERE", Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 77355B (20 July 2010); https://doi.org/10.1117/12.858274

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