Results 1 to 10 of about 503,685 (150)
Piston control with adaptive optics in stellar interferometry [PDF]
Astronomy & Astrophysics, 2001 The general purpose of an adaptive optics system is to correct for the wavefront corrugations due to atmospheric turbulence. When applied to a stellar interferometer, care must be taken in the control of the mean optical path length, commonly called differential piston.
C. Vérinaud, F. Cassaing
semanticscholar +4 more sources
SPIE Proceedings, 2016 On-sky adaptive optics wavefront screens have been used and random optical path fluctuations - differential pistons - have been included in numerical simulations for the Large Binocular Telescope Interferometer. We characterize the Point Spread Function (PSF) and the Optical Transfer Function (OTF) by computing respectively the interferometric Strehl ...
Fabien Patru +7 more
semanticscholar +5 more sources
Prism matching for piston segmentation correction with adaptive optics systems on extremely large telescopes [PDF]
Image and Vision Computing New Zealand, 2021 Images observed at ground-based telescopes are blurred by Earth’s atmosphere. Adaptive optics systems can correct for this blurring by using a wavefront sensor to measure the instantaneous wavefront aberration created by the atmosphere, and a deformable ...
Richard Clare +4 more
openalex +2 more sources
On-sky reconstruction of Keck Primary Mirror Piston Offsets using a Zernike Wavefront Sensor [PDF]
Astrophysical Journal, 2022 The next generation of large ground- and space-based optical telescopes will have segmented primary mirrors. Co-phasing the segments requires a sensitive wavefront sensor capable of measuring phase discontinuities. The Zernike wavefront sensor (ZWFS) is a passive wavefront sensor that has been demonstrated to sense segmented-mirror piston, tip, and ...
M. V. van Kooten +5 more
arxiv +3 more sources
Reversible compression of an optical piston through Kramers dynamics [PDF]
Phys. Rev. E 91, 042135 (2015), 2015 We study the reversible crossover between stable and bistable phases of an over-damped Brownian bead inside an optical piston. The interaction potentials are solved developing a method based on Kramers' theory that exploits the statistical properties of the stochastic motion of the bead. We evaluate precisely the energy balance of the crossover.
Cyriaque Genet, Gabriel Schnoering
arxiv +8 more sources
The LBTI Fizeau imager – II. Sensitivity of the PSF and the MTF to adaptive optics errors and to piston errors [PDF]
, 2017 We show numerical simulations with monochromatic light in the visible for the LBTI Fizeau imager, including opto-dynamical aberrations due here to adaptive optics (AO) errors and to differential piston fluctuations, while other errors have been neglected.
Fabien Patru +10 more
openalex +2 more sources
Piston Error Measurement for Segmented Telescopes with an Artificial Neural Network
Sensors, 2021 A piston error detection method is proposed based on the broadband intensity distribution on the image plane using a back-propagation (BP) artificial neural network.
Dan Yue, Yihao He, Yushuang Li
doaj +2 more sources
Multi-spectral piston sensor for co-phasing giant segmented mirrors and multi-aperture interferometric arrays [PDF]
Journal of Optics A: Pure Applied Optics vol. 11, 125503 (2009), 2009 This paper presents the optical design of a multi-spectral piston sensor suitable to co-phasing giant segmented mirrors equipping the Future Extremely Large Telescopes (ELTs). The general theory of the sensor is described in detail and numerical simulations have been carried out, demonstrating that direct piston and tip-tilt measurements are feasible ...
Angel R +5 more
arxiv +3 more sources
P-REx: The Piston Reconstruction Experiment for Infrared Interferometry [PDF]
, 2017 For sensitive infrared interferometry, it is crucial to control the differential piston evolution between the used telescopes. This is classically done by the use of a fringe tracker. In this work, we develop a new method to reconstruct the temporal piston variation from the atmosphere, by using real-time data from adaptive optics wavefront sensing ...
Pott, Jörg-Uwe +2 more
arxiv +3 more sources
APL Photonics, 2020 Adaptive optics (AO) methods are widely used in microscopes to improve image quality through correction of phase aberrations. A range of wavefront-sensorless AO schemes exist, such as modal, pupil segmentation zonal, and pixelated piston-based methods ...
Q. Hu +7 more
doaj +2 more sources