Multiple-aperture optical telescopes: cophasing sensor testbed

B. Sorrente; F. Cassaing; F. Baron; C. Coudrain; B. Fleury; F. Mendez; L. Mugnier; V. Bentadj-Paris; V. Michau; J. Montri; G. Rousset; L. Rousset-Rouviere; M.-T. Velluet

doi:10.1117/12.2500123

13 April 2018 Multiple-aperture optical telescopes: cophasing sensor testbed

B. Sorrente, F. Cassaing, F. Baron, C. Coudrain, B. Fleury, F. Mendez, L. Mugnier, V. Bentadj-Paris, V. Michau, J. Montri, G. Rousset, L. Rousset-Rouviere, M.-T. Velluet

Author Affiliations +

Proceedings Volume 10568, International Conference on Space Optics — ICSO 2004; 105682Q (2018) https://doi.org/10.1117/12.2500123
Event: International Conference on Space Optics 2004, 2004, Toulouse, France

Abstract

The goal of a cophasing sensor (CS) is to measure the phase disturbances between the sub-apertures or inside each aperture of a telescope. Three CSs are currently studied at ONERA. A first CS for Earth imaging is based on phase diversity on extended sources (cf companion paper by L. Mugnier). A second CS for intercalibration uses phase retrieval on a point source. The third CS for nulling interferometry (“DWARF”, for the ESA/DARWIN mission) is based on similar algorithms. To test performance of these CSs, ONERA has defined and integrated a multipurpose bench, “BRISE”. Its main features are the simultaneous imaging of a point source and of an extended source, the minimisation of absolute and differential disturbances, the use of any aperture configuration and the generation of pure calibrated piston/tip/tilt aberrations on three sub-apertures by a dedicated PZT-based device. Preliminary experimental results are consistent with numerical simulations and confirm nanometric performance.

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B. Sorrente, F. Cassaing, F. Baron, C. Coudrain, B. Fleury, F. Mendez, L. Mugnier, V. Bentadj-Paris, V. Michau, J. Montri, G. Rousset, L. Rousset-Rouviere, and M.-T. Velluet "Multiple-aperture optical telescopes: cophasing sensor testbed", Proc. SPIE 10568, International Conference on Space Optics — ICSO 2004, 105682Q (13 April 2018); https://doi.org/10.1117/12.2500123

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