摘要
本文介绍了云南天文台研制的三孔较差视宁度监视仪，统计了１９９４年３月至７月期间的试观测情况，及仪器定标和数据处理结果。
The Differential Image Motion Monitor (DIMM) with three sub-aperture was developed at Yunnan Observatory.The DIMM is attached to a 35cm telescope with f/ 15. The apertures are 23cm or 16.3cm apart and have a diameter of 10cm. Two 20' prism wedges are positioned over two of the three sub-apertures to separate two images from the other one by 10.4' at the focal plane.The monitor was first tasted the seeing near the dome of 1m telescope at Yunnan Observatory on Apr.8, 1994, and since then 1770 ro at 16 nights have been recorded. The average ro measured is 12cm, and has good correlation with diffraction ring observation.On May 24 and 25, 1994, Full Width at Half Maximum (FWHM) of stellar images was measured on 20s' exposure time in the direct CCD imaging mode with the 1m telescope. The mean FWHM of the images is 1.15',and the seeing measured by DIMM is 0.906'.
出处
《云南天文台台刊》
CSCD
1996年第1期58-68,共11页
Publications of the Yunnan Observatoty
