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BRISE: a Multipurpose Bench for Cophasing Sensors
- Source :
- Instrumentation Mesure Métrologie, Visions for Infrared Astronomy, Instrumentation, Mesure, Metrologie, Visions for Infrared Astronomy, Instrumentation, Mesure, Metrologie, Mar 2006, Paris, France. pp.309-312, Proceedings of the SPIE, SPIE, SPIE, May 2006, Orlando, Florida, United States. pp.3A, ⟨10.1117/12.671930⟩
- Publication Year :
- 2006
- Publisher :
- HAL CCSD, 2006.
-
Abstract
- The Cophasing Sensor (CS), which measures the disturbances between the sub-apertures, is a key component of multiple-aperture telescopes. As multiple-aperture telescopes become more ambitious, requirements for the CS become more demanding: low flux (for stellar interferometers), sub-nanometric accuracy (for interferometric nullers), image with very small contrast (for wide-field telescopes such as spaceborne Earth imagers), larger number of beams (for all applications). Focal-plane sensing is a solution to cope with all these requirements, with a very simple opto-mechanical setup. Two implementations have been investigated at ONERA: phase retrieval , using the sole focal-plane image, and phase diversity , based on the joint analysis of a focal and an extra-focal images. Phase diversity can measure any mode on any source, while phase retrieval is more suited to real-time piston/tip/tilt measurements on an unresolved (or partially resolved) source. To evaluate accurately the performance of CS or other high-resolution devices, ONERA has built a multipurpose bench called BRISE (Banc Reconfigurable d'Interferometrie sur Sources Etendues). BRISE mainly includes an extended scene and a reference point source, a deformable mirror, a focal-plane CS, afocal input/output ports to interface with other instruments, and a general purpose code MASTIC (Multiple-Aperture Software for Telescope Imaging and Cophasing). BRISE has already been (or will be) used for several applications, such as the validation of CSs for Earth imaging or nulling interferometry, or the exploration of advanced nulling techniques. This paper describes the bench and the investigated CSs, the experiments performed on BRISE, and reports main results such as nanometric accuracy or three-beam nulling.© (2006) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
- Subjects :
- Afocal photography
Aperture
Computer science
Optical engineering
Astrophysics::Instrumentation and Methods for Astrophysics
Deformable mirror
law.invention
Telescope
Cophasing
Interferometry
law
Astronomical interferometer
Phase retrieval
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Beam (structure)
Remote sensing
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Instrumentation Mesure Métrologie, Visions for Infrared Astronomy, Instrumentation, Mesure, Metrologie, Visions for Infrared Astronomy, Instrumentation, Mesure, Metrologie, Mar 2006, Paris, France. pp.309-312, Proceedings of the SPIE, SPIE, SPIE, May 2006, Orlando, Florida, United States. pp.3A, ⟨10.1117/12.671930⟩
- Accession number :
- edsair.doi.dedup.....663d1dcdb24f2f76f27830a211236271