Self-Contained Vertical Acoustic–Hydrophysical Measuring Systems Mollyusk-19 and Mollyusk-21

The self-contained vertical acoustic–hydrophysical measuring systems Mollyusk-19 and Mollyusk-21 were developed to study spatiotemporal inhomogeneities in the sound field velocity and in modal structures of low-frequency sound fields and internal waves. This paper describes the circuit, structural, and software solutions for the main problem posed when developing new systems to improve their performance characteristics. The possibilities of applying these systems to solve the formulated problems was illustrated by the results of field measurements on the Posiet Bay shelf in the Sea of Japan.