【摘要】 通过用６３３ｎｍ 短频Ｈｅ－Ｎｅ 激光代替氪灯，提高小数测量的准确度等措施，对常规柯氏干涉仪进行了改造，结果获得测量量块中心长度的标准不确定度为ｕｃ＝ （５．５ｎｍ ）２＋ （８．３×１０－ ８Ｌ）２，大大优于一等量块的最大允许不确定度更多还原

【Abstract】 By the improvements such as using a stabilized He\|Ne laser instead of Kr lamp,increasing the measurement uncertainty of the fraction order,etc.,the standard unceratinty of the measurement of the length of gauge block by using a Koester interferometer was obtained.It is much more better than the maximum permissible uncertainty of the 1st order gauge block.更多还原