MVP 4-Page Brochure
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Spanish Language Version
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MVP-FFCPT Paper from UDT Conference Dec 2006
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MVP Economic Benefits
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Moving Vessel Profiler™
- An Underway (Instride) Ocean Profiling System
The Moving Vessel Profiler™ (MVP) is a multi-purpose instrument for aiding in the collection of both shallow and deep water data sets. The MVP's primary function is to allow accurate data collection without the need to stop the vessel.
The system includes a computer-controlled smart winch and deployment system that allows the free fall fish to be deployed while the vessel is underway. The system is completely autonomous and can be controlled by computer without the requirement for personnel on deck. This serves the purpose of extending operations by not relying on deck crew after normal working hours and also through the expanded environmental operating envelope.
The system was originally adapted to collect Sound Velocity (SV) data for shallow water (100m) hydrographic operations. The data was used to calibrate multibeam sonar data for the Canadian Hydrographic Service.
The Free Fall Fish designed for use with the MVP system can carry a variety of sensor packages. Each fish is specifically designed to work with an MVP system to obtain that system's maximum operating depth. The Free Fall Fish come in single- and multi-sensor models. Sensors that have been used with the MVP system to date include Sound Velocity, CTD, Laser Optical Particle Counter (LOPC) and fluorometer. Please note that not all models of free fall fish are compatible with all models of the Moving Vessel Profiler.
There are currently five configurations of the Moving Vessel Profiler in use: the MVP200™, the MVP300™, the smallest system, the MVP30™, the MVP30-350 (a variant of the MVP30) and the MVP800™. Each system is designed to collect data to a certain depth and ship speed. The largest model in the MVP line, the MVP800™, is capable of deploying the sensor-equipped towfish to a depth of 800 metres at a ship speed of 12 knots. See the chart below for detailed specifications on each of these systems.
The following shows the major components of the MVP system. The computer controls the winch using parameters set by the operator, the depth signals sent back by the free fall fish and (if the vessel is equipped with one) readings sent to the MVP controller by the ship's depth sounder. The data is collected in real time from the fish and recorded by the computer in a format that can be presented graphically. Click on the various parts of the graphic to view larger images.
The animation above shows the MVP™ deployed from a typical vessel collecting three sets of profile data while underway. Click here to see an enlarged view of the animation.
As an example, an MVP™ profile to a depth of 100 metres would take four (4) minutes from deployment to recovery.
Things to note are the programmed bottom avoidance, the near-vertical free fall and the fact that the fish does not break the surface while underway. Please note that the elements of this animation are not to scale.
The illustration to the right shows the path of the Free Fall Fish for a typical cast. The sequence of events for a typical cast is:
3.) maximum depth
The MVP system allows repeated deployment of the fish for as long as necessary to compile a complete data set (see an example described in the February 1998 Press Release). The narrow red band seen behind the ship represents the small amount of area necessary to operate the MVP system (approximately 1 metre wide). This would allow it to be used simultaneously with applications that require a number of towed objects behind the vessel, such as seismic streamers, acoustic projectors, etc.
New Product Spotlight: MVP30-350™
MVP Product Family Specifications
MVP-Compatible Instruments from ODIM Brooke Ocean
ODIM Brooke Ocean manufacture other product lines that, as well as being self-contained instruments themselves, are fully compatible with the Moving Vessel Profiler.
LOPC The Laser Optical Particle Counter (LOPC) offers ADVANCED DATA COLLECTION features not found on conventional optical particle counters. The LOPC can be installed inside the MVP's Multi-Sensor Fish as part of its sensor payload. Find out more information on the LOPC here.
FFCPT The Free Fall Cone Penetrometer (FFCPT) was developed to collect geotechnical and geophysical data from the sea floor. The FFCPT can be installed on the MVP's tow cable (MVP200 and larger) and deployed in place of the Free Fall Fish, allowing multiple, automated drops either on station or from a variety of drop points. Also, the FFCPT can be deployed while underway, utilizing the MVP's native functionality. Find out more information on the FFCPT here or contact ODIM Brooke Ocean for more details.
A technical paper describing the implementation of FFCPT with MVP, presented at UDT Pacific December 2006, is now available here (1.3MB PDF).
For further information on the Moving Vessel Profiler™ systems and their recent uses, check the ODIM Brooke Ocean Press Releases! Also, see the Downloads page for MVP-related animation found on this page!
Contents Copyright ©2012 Rolls-Royce Canada Limited
URL: http://www.brooke-ocean.com/mvp_main.html (Last Updated: Feb 07, 2012)