System of Quartzmetres and the Absolute Length of its Gauges

Details System of Quartzmetres and the Absolute Length of its Gauges System of Quartzmetres and the Absolute Length of its Gauges

Apr 1967

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1967metro...3...37v&link_type=abstract

Metrologia, Volume 3, Issue 2, pp. 37-41 (1967).

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Scientific paper

Quartzmetre gauges have been made and studied in Turku since 1927, when it was already possible to compare them with one another to 10-8, but the uncertainty of the absolute lengths based upon the calibration against the metre prototype was 20 times as large. In 1953 the BIPM calibrated two quartzmetres against the green line of the nuclide Hg198. This measurement was adopted as a basis (system "T"). The calibration performed in the P.T.B. gave a correction ΔT = +1.0 μm exceeding tenfold mean errors. The present writers then began to set up equipment to compare quartzgauges of different lengths so that the absolute length of 1 metre could be attained by additions. The provisional result, using the Hg198 was ΔT = +1.12 μm. A new measurement recently performed by the BIPM gave ΔT = +1.27 μm. Investigations are still going on.

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