منابع مشابه
Linearity of the pyramid wavefront sensor.
The pyramid wavefront sensor is very similar to the Fourier knife-edge test, but employs dynamic modulation to quantify the phase derivative. For circular modulation, we compare approximate geometrical optics calculations, more exact diffraction calculations, and experimental results. We show that both the sinusoidal and the approximate linear relationship between wavefront derivative and wavef...
متن کاملX-ray wavefront characterization with two-dimensional wavefront sensors: shearing interferometers and Hartmann wavefront sensors
Phase reconstructions from a two-dimensional shearing inter-ferometer, based on two orthogonal phase gratings in a single plane, and a Hartmann sensor are compared. Design alternatives for both wavefront sensors are given, and simulated performance of both the two-dimensional x-ray shearing interferometer and Hartmann wavefront sensor are presented for two different phase profiles. The first co...
متن کاملMeasuring Phase Aberrations using a Pyramid Wavefront Sensor
The pyramid wavefront sensor (PWS) was initially proposed by astronomers to measure aberrations introduced by the atmosphere. More recently it has been used to measure aberrations of the human eye, and has been successfully incorporated into an adaptive optics loop to correct those aberrations. The raw sensor signal can be used as feedback to control a wavefront correcting device, or with appro...
متن کاملAdaptive optics for ophthalmic applications using a pyramid wavefront sensor.
A new adaptive optics system for the eye using a pyramid wavefront sensor interfaced in closed-loop with a piezoelectric deformable mirror is presented. Sensing parameters such as CCD integration time, pupil sampling and beam steering amplitude are tested on the bench and in vivo on several volunteers to optimize real-time optical correction. The system allows closed-loop operation at a frame r...
متن کاملPhoton counting arrays for AO wavefront sensors
Future wavefront sensors for AO on large telescopes will require a large number of pixels and must operate at high frame rates. Unfortunately for CCDs, there is a readout noise penalty for operating faster, and this noise can add up rather quickly when considering the number of pixels required for the extended shape of a sodium laser guide star observed with a large telescope. Imaging photon co...
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ژورنال
عنوان ژورنال: Journal of Astronomical Telescopes, Instruments, and Systems
سال: 2017
ISSN: 2329-4124
DOI: 10.1117/1.jatis.3.2.029001