Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Improving the performance of interferometric imaging through the use of disturbance feedforward

Not Accessible

Your library or personal account may give you access

Abstract

In this paper, we present a disturbance compensation technique to improve the performance of interferometric imaging for extremely large ground-based telescopes, e.g., the Large Binocular Telescope (LBT), which serves as the application example in this contribution. The most significant disturbance sources at ground-based telescopes are wind-induced mechanical vibrations in the range of 8–60 Hz. Traditionally, their optical effect is eliminated by feedback systems, such as the adaptive optics control loop combined with a fringe tracking system within the interferometric instrument. In this paper, accelerometers are used to measure the vibrations. These measurements are used to estimate the motion of the mirrors, i.e., tip, tilt and piston, with a dynamic estimator. Additional delay compensation methods are presented to cancel sensor network delays and actuator input delays, improving the estimation result even more, particularly at higher frequencies. Because various instruments benefit from the implementation of telescope vibration mitigation, the estimator is implemented as a separate, independent software on the telescope, publishing the estimated values via multicast on the telescope’s ethernet. Every client capable of using and correcting the estimated disturbances can subscribe and use these values in a feedforward for its compensation device, e.g., the deformable mirror, the piston mirror of LINC-NIRVANA, or the fast path length corrector of the Large Binocular Telescope Interferometer. This easy-to-use approach eventually leveraged the presented technology for interferometric use at the LBT and now significantly improves the sky coverage, performance, and operational robustness of interferometric imaging on a regular basis.

© 2017 Optical Society of America

Full Article  |  PDF Article
More Like This
Vibration rejection of phased array telescope systems via disturbance-propagation-characteristics-based feedforward control

Qiong Tu, Rong-Qi Ma, Qiang Wang, Yong-Mei Huang, Jian-Liang Shi, Liang-Zhu Yuan, Jin-Ying Li, Kai-Yuan Yang, Yang Li, and Wei Tang
Appl. Opt. 62(21) 5696-5706 (2023)

Calibrating the interaction matrix for the LINC-NIRVANA high layer wavefront sensor

Xianyu Zhang, Carmelo Arcidiacono, Albert R. Conrad, Thomas M. Herbst, Wolfgang Gaessler, Thomas Bertram, Roberto Ragazzoni, Laura Schreiber, Emiliano Diolaiti, Martin Kuerster, Peter Bizenberger, Daniel Meschke, Hans-Walter Rix, Changhui Rao, Lars Mohr, Florian Briegel, Frank Kittmann, Juergen Berwein, and Jan Trowitzsch
Opt. Express 20(7) 8078-8092 (2012)

Technique for combining incoherent interferometric images

E. Keith Hege, Julian C. Christou, Stuart M. Jefferies, and Matthew Cheselka
J. Opt. Soc. Am. A 16(7) 1745-1750 (1999)

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 Optica member, or as an authorized user of your institution.

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

Figures (18)

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

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

Tables (3)

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

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

Equations (18)

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

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

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved