The Mollyusk-07 self-contained vertical acoustic-hydrophysical measuring system

The Mollyusk-07 self-contained vertical acoustic-hydrophysical measuring system has been designed for experimental studies of the mode structure of internal waves and low-frequency sounds that propagate in shelf zones of seas and oceans. The Mollyusk-07 is capable of synchronously measuring the variations in the sound pressure over a 10- to 5000-Hz frequency band and water temperatures with a resolution of up to 0.006 degrees C at eight depths, as well as the absolute values of the flow velocity at one of the depths; it also monitors the positions of the upper and middle hydrophones along the depth. The Mollyusk-07 is intended to be installed at depths of up to 100 m beneath the sea surface by the anchor separated by an acoustic release. The program control over the measurement and data acquisition modes is realized in the system. The self-sufficiency of operation in the sea is at least 7 days. In 2007, the Mollyusk-07 passed tests on the shelves of the seas of Japan and Okhotsk.