In this paper, we present the roundness measurement capability and traceability at CSIR National Physical Laboratory-India (NMI-India). A glass hemisphere is used for traceability, and measurements are taken with a roundness machine. The LSC method with the minimum zone solution is used for the analysis of results for circular profiles. The measurement uncertainty for the glass hemisphere calibration using roundness machine is ± 0.017 µm.

中文翻译：

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在CSIR-国家物理实验室-印度校准玻璃半球和可追溯性

在本文中，我们介绍了 CSIR 印度国家物理实验室 (NMI-India) 的圆度测量能力和可追溯性。玻璃半球用于可追溯性，并使用圆度机进行测量。具有最小区域解的 LSC 方法用于分析圆形轮廓的结果。使用圆度机校准玻璃半球的测量不确定度为 ± 0.017 µm。