Development of a Low-order Adaptive Optics System at Udaipur Solar Observatory

Journal of astrophysics and astronomy

R. E. Louis¹  A. R. Bayanna1¹  S. K. Mathew¹  P. Venkatakrishnan¹  B. Kumar¹ 

[1] Udaipur Solar Observatory, Physical Research Laboratory, P.O. Box 198, Dewali, Badi Road, Udaipur 313 001, India.$$

关键词: Sun: astronomical seeing;    adaptive optics;    solar telescopes;    solar imaging.;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

A low-order Adaptive Optics (AO) system is being developed at the Udaipur Solar Observatory and we present in this paper the status of the project, which includes the image stabilization system and calibration of wavefront sensor and deformable mirror. The image stabilization system comprises of a piezo driven tip-tilt mirror, a high speed camera (955 fps), a frame grabber system for sensing the overall tilt and a Linux based Intel Pentium 4 control computer with Red Hat Linux OS. The system operates under PID control. In the closed loop, an rms image motion of 0.1–0.2 arcsec was observed with the improvement factor varying from 10–20 depending on the external conditions. Error rejection bandwidth of the system at 0 dB is 80–100 Hz. In addition to that, we report the on-going efforts in the calibration of lenslet array and deformable mirror for sensing and correcting the local tilt of the wavefront.

【 授权许可】

Unknown