三孔较差视宁度仪的对比观测

三孔较差视宁度仪（ＤＩＭＭ）已在丽江高美古和云南天文台投入观测，我们用云南天文台的一米望远镜测得的视宁度与ＤＩＭＭ所测得的视宁度进行对比。１９９５年上半年获得了５个晚上的资料，测得的结果表明ＤＩＭＭ测量的视宁度与一米望远镜测量的视中度是相关的。二套ＤＩＭＭ也进行了相互校正和对比，共用了８个晚上获得１２５组ｒ０，二套ＤＩＭＭ的视宁度测量值是相关的，二套系统的误差小于１％。

Observational Comparison of Seeing Measurments with the DIMMs

Two sets of the DIMM have been already used for the seeing observations at the Yunnan Obervatory and the Gaomeigu Station. The Comparison of the measurements by using the DIMM and lm telescope profile have been made at the Yunnan Observatory. In the first half year of 1995 the observational data had ben obtained at five nights. The resultS show that seeing measurements by using two methods are correlated. Comparisom have also been made for two sets of the DIMM at 8 nights with 125 r0. It is shown that the seeing measurements with the two sets of the DIMM are correlated and the error for the two systems is less than 1%.