Physics – Instrumentation and Detectors
Scientific paper
2007-05-04
actes du congr\`es (18/06/2007) 4
Physics
Instrumentation and Detectors
4
Scientific paper
Determination of air density and the quantitative estimates of water vapour adsorbed or desorbed by the surface of mass standard, remain the principals sources of uncertainties when weighing mass standard made from stainless steel or super alloy. The classical method, for air density determination, use the so called CIPM-1981/91 formula and the measured air parameters. An other approach is based only on the results of comparisons, realized successively in air and in vacuum, between special artefacts. The distribution and the state of water molecules inside the chamber of mass comparator influence the results of weighing. Also, the instruments used for air moisture measurement are either, not very sensitive (capacitive hygrometer) or disturbing for environment (dew-point hygrometer). To control that, a proposal method is given and observations of water vapour behaviour inside the enclosure for different conditions are reported. Keywords. mass metrology, air density, water vapour
Khélifa Naceur-Eddine
Pinot P.
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