Calibration of an underwater sound receiver with a large ratio of longitudinal size to transverse

A.E. Isaev

FSUE «VNIIFTRI», Mendeleevo, Moscow region, Russia

Al’manac of Modern Metrology № 2 (26) 2021, pages 104–114

Annotation. When calibrating a underwater sound receiver with a large ratio of the longitudinal to the transverse dimension, the limitations caused by the problem of the far-field conditions ensuring can be overcome by radiating a sound wave with a cylindrical front. If the receiver symmetry axis in the longitudinal direction coincides with the tangent to the wave front, the sound pressures on the device longitudinal dimension will be the same in amplitude and phase. The far field will determine by the wave front curvature at the transverse dimension. The far-field distance decrease in proportion to the square of the ratio of the device longitudinal dimension to transverse compared to irradiation with a spherical wave. The results of modeling, confirming the possibility of synthesizing a sound wave with a cylindrical front with acceptable for calibration quality using a linear phased array are presented. The simultaneous radiation by the array elements replace with radiation by single element sequentially placed in the nodes of the array is proposed.

Key words: underwater sound receiver, calibration, far-field distance, cylindrical wave synthesis, virtual phased radiating array.

Full texts of articles are available only in Russian in printed issues of the magazine.