EUROMET comparison: diameter of small ring gauges

摘要

Comparison measurements of the diameter of small ring gauges (0.1 mm to 1 mm) were carried out by six European national metrology institutes (NMIs). The participants applied different measurement principles: mechanical contacting measurement and optical measurement with respect to the projection of the inner diameter or with respect to the position of the cylinder edges. The uncertainties associated with the diameter measurement results vary considerably among the different participants, from U=0.10 μm to U=5 μm. In general the measurement results agree within their associated uncertainties, with the exception of the optical measurements of the position of the cylinder edges which exceed the reference values by between 10 μm and 30 μm, probably because of the lacerated edges of the ring gauges.