http://arxiv.org/abs/1908.11027
We developed a tip-tilt system to compensate the turbulence induced image motion for 1.3 m telescope at Vainu Bappu Observatory, Kavalur. The instrument is designed to operate at visible wavelength band (480-700 nm) with a field of view $1^{\prime}\times1^{\prime}$. The tilt corrected images have shown up to $\approx$ 57% improvement in image resolution and a corresponding peak intensity increase by a factor of $\approx$ 2.8. A closed-loop correction bandwidth of $\approx$ 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 $\sim$ 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 the details of the instrument design, laboratory calibration studies and quantify its performance on the telescope.
S. V, R. Banyal, S. R, et. al.
Fri, 30 Aug 19
8/58
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