野外大长度标准器-24m因瓦基线尺量值的可靠性  

Reliability of the Value of an Outdoor Large Dimension Standard- 24 m Invar Wire

作　　者：李建双[1] 梁平 赵岩[1] 陶香琴[1] 朱固瑞[1] 

机构地区：[1]中国计量科学研究院,北京100013 [2]广州省计量科学研究院,广东广州510405

出　　处：《计量学报》2008年第B09期74-76,共3页Acta Metrologica Sinica

摘　　要：野外主要标准基线场的长度量值，均采用24m因瓦基线尺进行测量，其测量结果相对标准偏差一般优于5×10^-7，基线场的长度量值（基线量值）的测量误差除野外的测量误差外，主要有基线尺本身的长度测量不确定度和温度线膨胀系数测量不确定度。24m光学机械比较仪是利用比较测量的原理室内检测基线尺长度的标准装置，其测量结果不确定度U99优于15μm/24m。通过分析光学机械比较仪检测基线尺的不确定度和检测数据，评估基线尺量值的可靠性。Now, a 24 m invar wire is used for the measurement of outdoor standard baseline in our country. Generally its relatively standard deviation is not greater than 5 × 10^-7 . All baseline measurement errors are mostly the measurement errors of invar wire in length and thermal expansion coefficient beside the outdoor measurement errors. Optical-mechanical comparator is a standard equipment for the measurement of invar wire in length indoor by using comparative measurement principle. The expanded uncertainty U99 is not greater than 15 μm/24 m. The reliability of invar wires value is assessed by analyzing measurement uncertainty and data.

关 键 词：计量学 基线尺 标准基线 不确定度 光学机械比较仪 

分 类 号：TB92[一般工业技术—计量学]