An Investigation of the Potential Efficiency of Shift-and-Add Real-Time Correction

The potential efficiency of shift-and-add (SAA) real-time correction is investigated. The study is performed using the data obtained with a 2.1-m telescope. The experimental data consist of sets of star images obtained with a high-speed CCD camera. The observations were performed during seven nights; 26 total sets of data were gathered, each containing 10,000 frames captured with a speed of 200 frames s(-1). The data reduction allows us to estimate the temporal efficiency of SAA real-time correction in dependance of correction speed. Analyzing the results obtained, one can conclude that, on average, the SAA correction can be quite efficient even under a quite low correction speed (30-50 Hz). Because these results were obtained for a visible range (V band), another, maybe more interesting conclusion can be made: SAA real-time correction can work in the visible range where conventional adaptive systems have quite low efficiency.