Results of the COOMET 706/RU-а/16 pilot comparison of national standards of the unit of propagation velocity of longitudinal ultrasonic waves in solids

The results of comparisons of national standards of the unit of propagation velocity of longitudinal ultrasonic waves in solids are presented (COOMET 706/RU-a/16 pilot comparisons). Comparisons were made in 2018–2021 with the participation of national metrological institutes of Russia, Belarus, Ukraine and China. The main purpose of these comparisons was to check the measuring capabilities of the participating laboratories, analyze the components of measurement uncertainty, evaluation the reproducibility of measurement results, as well as test the travelling transfer standards, schedules and methods of their transportation. For the fi rst time in the metrology of acoustic measurements in solids, comparisons of six national standards were carried out, in which various methods of excitation and registration of ultrasound (non-contact optical and capacitive methods, immersion piezoelectric method) and various methods of measuring the propagation velocity of longitudinal ultrasonic waves in solids (pulse echo, resonance, through-transmission substitution technique) were implemented. Given the stable reference block characteristics, a hybrid comparison scheme is decided upon. Six test blocks (velocity measures) made of quartz glass, BK8 optical glass and 40X13 steel have been chosen as travelling transfer standards. The measurements of the propagation velocity of longitudinal ultrasonic waves in test blocks were performed at the frequencies 2.25–2.5, 5 and 10 MHz in accordance with the measurement procedure adopted on this standard. The comparisons showed the consistency of most of the measurement results obtained in the participating laboratories. Individual discrepancies in the results of the comparisons may be related to the possible underestimation of the quoted standard uncertainties of measurements by the comparisons participants, as well as the presence of unaccounted for infl uencing factors, which requires additional studies to determine the causes.

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