Approaches to the amplitude-phase calibration of a hydrophone by the reciprocity method

A.E. Isaev, A.M. Polikarpov, B.I. Khatamtaev

FSUE “VNIIFTRI”, Mendeleevo, Moscow region, Russia,,

Al’manac of Modern Metrology № 4 (32) 2022, pages 140–150

Abstract. The problems of using the geometric center and the nominal size of the active element in measuring the phase-frequency response of the hydrophone by the reciprocity method are discussed. According to the results of experimental studies of hydrophones of various types, it was found that the displacement of the acoustic center of a hydrophone relative to its geometric center is a common phenomenon that significantly affects the accuracy of measurements of the phase-frequency response. The nominal and acoustically measured dimensions of the hydrophone active element can differ significantly. It is shown that in order to recalculate the amplitude-frequency response of a hydrophone into a phase-frequency response and vice versa, it is preferable to deter­mine the position of the acoustic center and the size of the active element of the hydrophone using the acoustic method.

Keywords: amplitude-phase hydrophone calibration, hydrophone acoustic center, active element equivalent radius.

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