R2Sonic 2022, Operation Manual

Page: 27 / 133

Page 27 of 133
Version 3.0 REV r000
Date 25-08-2010
3.2.3 Moon Pool Mount
Deploying the sonar head through a moon pool is usually a more stable mounting arrangement than
an over-the-side pole. A moon pool is an area, within a vessel, that is open to the water. The sonar
head is normally mounted in such a way that it can be deployed and recovered through the moon
pool. The pole or structure that the sonar head is mounted on is normally shorter and sturdier than
an over-the-side mount; this can allow for higher survey speeds.
3.2.4 Hull Mount
The hull mount is the sturdiest of all possible ways to mount a sonar head. With a hull mount, the
sonar head is physically attached to the vessel’s hull. With this way of securing the sonar head,
there is no possibility of movement, outside that of the movement of the vessel.
There are disadvantages to the hull mount: the head cannot be inspected easily for marine growth
or damage; the vessel may be restricted in the depth of waters that can be surveyed, due to the
head being permanently attached to the hull.
A normal hull mount will also involve the fabrication of a fairing, on the hull, to ensure correct flow
patterns over the sonar head.
3.2.5 ROV Mounting
The Sonic 2024/2022 is ideal for undersea operations due to its compact size and low power
consumption. With all processing being done in the Receive Module, all that is required is to
provide Ethernet over single mode fibre optic communication, between the SIM and the Receive
Module. The 48VDC is supplied via the ROV’s own power distribution.