Abstract

The time delay engendered by wavefront sampling and data processing inevitability exists in almost all the wavefront sensor (WFS) based adaptive optics (AO) systems. Also, when WFS is used for tip–tilt aberration detection, the time delay significantly reduces the tip–tilt correction performance of the AO system. In this paper, we focus on researching time delay in a tip–tilt (TT) control system and introduce a predicted signal compensation method (PSCM) to compensate the time delay by modifying the WFS detected signals. Based on a precise model of a TT dynamic control system, the detection delay of TT corrections included in a WFS detected signal can be compensated. Experiments are conducted in the lab: the pure integrator (I), proportional and integral (PI) wavefront TT controllers, and these controllers with PSCM are compared to test the efficiency of the PSCM for TT corrections. For the PI controller, the rejection bandwidth increases from 52 to 62 Hz by using PCSM; meanwhile, the open-loop phase margin increases from 45 to 60 deg. In addition, astronomical observation results are also given based on the PI wavefront TT controller. The PSCM improves the Strehl ratio by a factor of 1.3. The new method is proven to improve the AO system closed-loop performance not only for increasing the closed-loop rejection bandwidth but also in favor of the error attenuation at low frequency. Furthermore, the method does not introduce more noise to the system.

© 2015 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
High-precision identification of a tip–tilt control system for the compensation of time delay

Yukun Wang, Zhaoliang Cao, Lifa Hu, Xingyun Zhang, Dayu Li, Huanyu Xu, Shaoxin Wang, Quanquan Mu, and Li Xuan
Appl. Opt. 56(5) 1431-1437 (2017)

Wavefront detection method of a single-sensor based adaptive optics system

Chongchong Wang, Lifa Hu, Huanyu Xu, Yukun Wang, Dayu Li, Shaoxin Wang, Quanquan Mu, Chengliang Yang, Zhaoliang Cao, Xinghai Lu, and Li Xuan
Opt. Express 23(16) 21403-21413 (2015)

Simple and robust algorithm to extend the dynamic range of tip-tilt for a Shack–Hartmann sensor

Mingxing Li, Dayu Li, Lifa Hu, Quanquan Mu, Zhaoliang Cao, Huanyu Xu, Xinghai Lu, and Li Xuan
Appl. Opt. 54(30) 9030-9036 (2015)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (10)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (3)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription