Challenges on double ended gauge block interferometry unveiled by the study of a prototype at PTB
Challenges on double ended gauge block interferometry unveiled by the study of a prototype at PTB
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DOI：
10.1088/0026-1394/49/3/307
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发表时间：
2012-06-01
期刊：
影响因子：
2.4
通讯作者：
Schoedel, Rene
中科院分区：
文献类型：
--
作者：
Abdelaty, Amany;Walkov, Alexander;Schoedel, Rene
量块（GB）是非常重要的材料标准，为行业提供可靠和可追溯的长度标准。在最高精度水平下，必须通过干涉测量法进行GB的测量。双端干涉仪（DEI）提供了一种替代方案，以获得GB形物体绝对长度的可追溯测量，而无需将压板拧到其中一个面上。尽管有这种普遍的优点，但在任何国家计量研究所（NMI）都没有使用可靠的DEI系统。作为德国的NMI，PTB正在开发一种专用的DEI，该DEI将位于温度稳定的真空室中。本文介绍了一个初步的原型DEI，首先建立研究的测量原理，其次要了解的挑战和限制，要考虑到最终的设计。DEI测量结果与PTB现有单端GB干涉仪（SEI）测量结果的比较表明，本原型是最终版本的基础。
Gauge blocks (GBs) are very important material standards that provide industry with reliable and traceable standards of length. At the highest accuracy level, the measurement of GBs must be performed by interferometry. The double ended interferometer (DEI) offers an alternative to obtain traceable measurements of the absolute length of GB shaped objects without the need for a platen to be wrung to one of the faces. In spite of this general advantage, there is no reliable DEI system being used at any National Metrology Institute (NMI). PTB, as the NMI of Germany, is developing a dedicated DEI which will be situated in a temperature-stabilized vacuum chamber. This paper describes a preliminary prototype DEI that was built firstly to study the measurement principle, and secondly to learn about the challenges and limitations to be taken into consideration for the final design. A comparison of results from the DEI measurements and those from PTB's existing single ended GB interferometers (SEI) indicates that the present prototype is a basis for the final version.