CORRELATION BETWEEN ASTRONOMICAL SEEING AND LOCAL FLUCTUATION OF THE ATMOSPHERE

我们研制了高速温度波动测量系统（CT 2监测仪）和光学视宁度监测仪。我们的CT 2监测仪可以测量低至2x 10 -7 K2 m-2/3，这是我们以前使用的灵敏度的3倍。光学视宁度监视器由两个直径为10 cm的望远镜组成，它们安装在同一个安装架上，相距50 cm，并测量每个望远镜产生的两个像点之间的跳动相关性。利用自适应光学系统在红外模拟望远镜上进行了同步观测，研究了圆顶内外视宁度的相关性，并研究了利用波前传感器控制的高速快门或视宁度监视器进行图像选择的效率。我们可以在可接受的损失时间内获得适度改善的图像，例如，当视尺寸为0.62弧秒时，可以使用20%的观察时间获得FWHM=0.54弧秒的图像。

We have developed high-speed temperature fluctuation measurements system (CT2 monitor) and optical seeing monitor. Our CT2 monitor can measure down to 2x10-7 K2m-2/3, which is about 3 times sensitive than we have used before. Optical seeing monitor consists of two 10 cm diameter telescope mounted on the same mount separated by 50 cm, and measure the correlation of dancing between the two image spots generated by each telescopes. Simultaneous observations with adaptive optics system on Infrared simulator telescope has been made and investigated the correlation between seeing inside and outside of the dome.We also investigated the efficiency of image selection technique using high-speed shutter controlled by wave-front sensor or seeing monitor. We can obtain moderately improved images with acceptable loss-time, for example FWHM=0.54 arcsec image can be obtained using 20% of observing time when seeing size is 0.62 arcsec.