R Thalmann 2002 Metrologia 39 165 doi:10.1088/0026-1394/39/2/6
CCL key comparison: calibration of gauge blocks by interferometry
R Thalmann
Show affiliationsKEY COMPARISON
An international comparison of gauge block measurements by interferometry has been carried out. The comparison is part of the set of key comparisons established by the Consultative Committee for Length (CCL) and contributes to the mutual recognition of calibration certificates issued by national metrology institutes (NMIs). Eleven laboratories representing the four major metrology regions participated in this comparison, which took place in 1998/1999. The standards to be calibrated were ten steel gauge blocks and ten tungsten carbide gauge blocks with nominal lengths between 0.5 mm and 100 mm. The measurand was the central length determined by optical interferometry, as defined in International Standard ISO 3650. The agreement between the measurement results was satisfactory, the major problems encountered being due to the determination of the corrections, taking into account the different properties of the measurement surfaces and the reference platens. The arithmetic mean was found to be the most adequate method for calculating the key comparison reference values.
- PACS
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06.30.Bp Spatial dimensions (e.g., position, lengths, volume, angles, and displacements)
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Issue 2 (April 2002)
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CCL key comparison: calibration of gauge blocks by interferometry
R Thalmann 2002 Metrologia 39 165
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