Results 1 to 10 of about 325,753 (218)
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
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
Improving the performance of multifocal diffractive lens designs by adding a peripheral piston. [PDF]
Biomed Opt ExpressPeripheral piston modulation in diffractive multifocal lenses suggests potential improvements in distance vision quality. Five lens designs—bifocal (BF), bifocal with piston (BFP), trifocal (TF), trifocal with piston (TFP), and a commercial refractive ...
Goswami S +5 more
europepmc +2 more sources
Optical Enhancement of Diffraction Efficiency of Texas Instruments Phase Light Modulator for Beam Steering in Near Infrared [PDF]
Micromachines, 2022 Phase light modulator (PLM) by MEMS mirror array operating in a piston-mode motion enables a high-speed diffractive beam steering in a random-access and flexible manner that makes a lidar system more intelligent and adaptive.
Jiafan Guan +3 more
doaj +2 more sources
Mode-Voltage Constrained Control for Adaptive Optics System
IEEE Photonics JournalIn the adaptive optics system of astronomical observation, the deformable mirror and the tip/tilt mirror are coupled during the correction process.
Ruitao Wang +7 more
doaj +2 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