ROV's like this
are used today for underwater inspections, and will also be relevant
to connect to the
new camera. Illustrasjonsfoto: ThinkStock
(January 9, 2016) A
new subsea camera has been developed that can see two to three times further
under water than existing cameras and calculate distances to objects. This will
make work carried out under water much easier.
SINTEF researchers are currently working together with
world-leading partners in Europe to develop sensors and lasers for this new
underwater camera.
The new tool is designed to make it easier to detect
pollution on the seabed, facilitate marine species management, and carry out
subsea inspections and maintenance.
Marine researchers can obtain answers to questions such as:
How many fish and other marine organisms are living in the water and on the
seabed, and how big are they?
Better general and
detailed imaging
Tests already carried out demonstrate that the project is on
the right track. In order to demonstrate the camera’s potential, the
researchers constructed a frame which they placed on the seabed in Oslo Fjord
in an area characterised by turbid water. They took pictures of their “target”
using the new prototype and compared them with those taken by a standard
camera. Even the first version of the new system produced much clearer images
than the standard system.
Left: an image of
a chessboard pattern taken by a standart camera at a distance
of 7,5 metres.
Right: an image of the same object taken by the new camera prototype.
Photo:SINTEF
The camera can also be installed on the hulls of surface
vessels, or on ROVs, in order to monitor keys areas of the seabed.
“The new camera will provide better general and detailed
imaging, and an entirely different database to that we are used to”, says Project
Manager Jens Thielemann at SINTEF.
How many crayfish are
there, and how big are they?
The monitoring of marine organisms depends not only on being
able to classify species and count individuals, but also an ability to
calculate their size.
Currently, marine species management is carried out by means
of data gathering using sonar and traditional video cameras. Sonar can detect
objects over longer distances, but does not resolve details, while video
cameras can observe organisms on the sea floor, but are unable to determine
their size or numbers. The cameras can either be mounted on ROVs or, in simpler
systems, installed on sleds or the hulls of surface vessels.
“The biggest problem with traditional cameras is that their
range is reduced in poor visibility, particularly in coastal waters made turbid
by suspended sand and clay particles. Such cameras have a very limited range
under these conditions”, says Thielemann.