Benefit of higher closed-loop bandwidths in ocular adaptive optics.
نویسندگان
چکیده
We present an ocular adaptive optics system with a wavefront sampling rate of 240 Hz and maximum recorded closed-loop bandwidth close to 25 Hz, but with typical performances around 10 Hz. The measured bandwidth depended on the specific system configuration and the particular subject tested. An analysis of the system performance as a function of achieved bandwidth showed consistently higher Strehl ratios for higher closed-loop bandwidths. This may be attributed to a combination of limitations on the available technology and the dynamics of ocular aberrations. We observed dynamic behaviour with a maximum frequency content around 30 Hz.
منابع مشابه
Optimizing closed ioop adaptive optics performance using multiple control bandwidths
The performance of a closed loop adaptive optics system may in principle be improved by selecting distinct and independently optimized control bandwidths for separate components, or modes, of the wave front distortion profile. In this paper we outline a method for synthesizing and optimizing a multi-bandwidth adaptive optics control system from performance estimates previously derived for singl...
متن کاملOptimizing closed-loop adaptive-optics performance with use of multiple control bandwidths
The performance of a closed-loop adaptive-optics system may in principle be improved by selection of distinct and independently optimized control bandwidths for separate components, or modes, of the wave-frontdistortion profile. We describe a method for synthesizing and optimizing a multiple-bandwidth adaptiveoptics control system from performance estimates previously derived for single-bandwid...
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 کاملMultiple Control Bandwidth Computations in Adaptive-optics
A study is made of a non{smooth matrix optimization problem arising in adaptive{ optics, which involves the optimal real{time control of a very fast{acting deformable mirror designed to compensate for atmospheric turbulence and other image degradation factors, such as wind{induced telescope vibration (windshake). The surface shape of this mirror must change rapidly to correct for time{varying o...
متن کاملDual-thread parallel control strategy for ophthalmic adaptive optics.
To improve ophthalmic adaptive optics speed and compensate for ocular wavefront aberration of high temporal frequency, the adaptive optics wavefront correction has been implemented with a control scheme including 2 parallel threads; one is dedicated to wavefront detection and the other conducts wavefront reconstruction and compensation. With a custom Shack-Hartmann wavefront sensor that measure...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Optics express
دوره 11 20 شماره
صفحات -
تاریخ انتشار 2003