COOMET 786/RU-a/19: results of pilot comparisons of hydrophones amplitude-phase free-field calibrations in the frequency range from 10 to 500 kHz

A.E. Isaev1, Ghen Yi2, A.N. Matveev1, Jia Guanghui2, B.I. Khatamtaev1, Wang Shiquan2, N.G. Shcherblyuk1

1FSUE “VNIIFTRI”, Mendeleevo, Moscow region, Russia
2HAARI, Hangzhou, Fuyang Zhejiang, China

Al’manac of Modern Metrology № 4 (32) 2022, pages 151–168

Abstract. The described COOMET project 786/RU-a/19: bilateral experimental comparisons of the calculated phase calibrations of hydrophones in the field at a frequency from 10 to 500 kHz between the Hangzhou Applied Acoustics Research Institute (HAARI) and the Russian Metrological Institute of Technical Physics and Radio Engineering (VNIIFTRI — pilot laboratory). The measu­re­ments were made, compiled and confirmed by comparing the uncertainty budgets of the measure­ment results of the module and the argument of the complex sensitivity of the reference hydrophone RHS-6. Typical results obtained in the frequency range of comparisons were 1.2–1.3 dB for the module and 0.14–0.16 radians for the hydrophone sensitivity index. The correctness of the methods used to evaluate the phase-phase calibrations of hydrophones in the field, including the method for calculating the frequency dependence of the indicator from the frequency dependence of the hydrophone sensitivity, has been confirmed.

Keywords: metrology of underwater sound measurements, COOMET pilot comparisons, amplitude-phase hydrophone calibration.

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