Atmospheric Optics by N. F. Kuprevich, A. Kh. Kurmaeva (auth.), Nikolai B. Divari

Optics

By N. F. Kuprevich, A. Kh. Kurmaeva (auth.), Nikolai B. Divari (eds.)

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5). Analysis of Fig. 6, and then decreases slowly. ts in which maximum effectiveness occurs are 0~5-0~6, which correspond to a vibration frequency of the order of 1 Hz. The lower size limits of deformations resulting in this frequency are 142 -172 cm. Variation of Vibration Amplitude with Interval Length In determining the effective lengths of the intervals, we took into account the frequency of appearance of the interval as well as the vibration amplitude. ts· and n is the number of such amplitudes.

Mean amplitudes are not given for intervals greater than 2~O, since their frequency of appearance is small. tS from on to H6 is easily seen from the graph in Fig. 6. The decrease in amplitude at H6-2~0 is evidently explained by the fact that for D = 20 cm, the angle e decreases with high L (see Fig. 1). ut. Thus, image vibration can be explained by inclination of the median plane. An isolated image shift is caused by inclination of a wave-front segment equal to D cos e, where tan e = 0" IF. t S reflects the star-image vibration-frequency distribution.

Figure 5a shows some typical good images selected from the series with pulse control of the electronic shutter. For comparison, Fig. 5b shows some representative types of poor images obtained with manual and pulse control. 15. 16. Thus, for the given observation season at the Crimean Astrophysical Observatory with a 200-mm aperture and an 8-msec exposure, an average of at least one good-quality image is obtained in every 1000 frames. These 1000 frames can be photographed in 30 min. Quality control increases the probability of obtaining good images by one order of magnitude.

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