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Title: Development of image motion compensation system for 1.3m telescope at Vainu Bappu Observatory
Authors: Sreekanth Reddy, V
Banyal, R. K
Sridharan, R
Kamath, P. U
Aishwarya, S
Keywords: Adaptive optics;Atmospheric effects;High angular resolution
Issue Date: Jan-2020
Publisher: IOP Publishing
Citation: Research in Astronomy and Astrophysics, Vol. 20, No. 1, 12
Abstract: We developed a tip-tilt system to compensate the turbulence induced image motion for the 1.3 m telescope at Vainu Bappu Observatory, at Kavalur. The instrument is designed to operate at the visible wavelength band (480 − 700 nm) with a field of view of 1' × 1'. The tilt corrected images have demonstrated up to ≈ 57% improvement in image resolution and a corresponding peak intensity increase by a factor of ≈ 2.8. A closed-loop correction bandwidth of ≈ 26 Hz has been achieved with on-sky tests and the root mean square motion of the star image has been reduced by a factor of ~ 14. These results are consistent with theoretical and numerical predictions of wave-front aberrations caused by atmospheric turbulence and image quality improvement expected from a real-time control system. In this paper, we present details of the instrument design, laboratory calibration studies and quantify its performance on the telescope.
Description: Restricted Access
ISSN: 2397-6209
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Appears in Collections:IIAP Publications

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