Magnets Marine Applications
Few metal-based surfaces are able to endure the relentless corrosive forces that occur around Marine environments. For this reason, anti-corrosive magnetic alloys or magnets with protective coatings are often employed to resist these conditions. Businesses or recreational activities that encounter Marine environments include shipyards, commercial and charter fishing operations, public marinas, cruise ships and sightseeing vessels, seaside infrastructure maintenance, underwater salvage operators and all the associated plant, marine craft and boating equipment they need to conduct their activities. navy magnet.
Samarium Cobalt (SmCo) magnets are manufactured from highly corrosion-resistant Rare Earth alloy and are ideal for harsh aquatic conditions. They are also able to tolerate heat affected applications (up to 250°C). Similar to high-humidity applications, magnets with protective coatings are also suitable for marine environments. Coatings of Teflon, Plastic or Epoxy protect the magnet from the harsh conditions that marine environments present. Shipwrights that need to repair or modify steel hulled vessels find countless uses for corrosion resistant magnets and often find them to be an excellent holding or clamping tool as they perform their work. International shipping companies with vessels that move thousands of steel containers around the world also find magnets invaluable. Booms that float on the ocean surface and contain oil spills from ruptured tankers are often attached magnetically, as are the access ladders that harbour pilots use to board container ships as they approach a port or prepare to dock at a terminal. Some underwater salvage operators use sealed magnetic retrieval devices to drag the seabed or waterways for submerged metallic materials that need to be removed to prevent contamination or retrieved for their monetary value.
Magnets for Marine Applications
Marine Magnetic Methods
Magnetic methods, as employed in marine applications, differ little in theory from surface magnetic surveys. The instrument measures the earth’s total magnetic field at each measurement location. However, practical applications of field techniques, field equipment, and geographic control can vary greatly between surface and marine surveys.
In the case of marine surveys, the magnetometer is generally a towed sensor. The Geometrics G-882 is one example of a marine magnetometer and can be seen in figure 1. Positional control is generally provided by a global positioning system (GPS) where the GPS sensor is mounted on the vessel towing the magnetometer, with a constant offset equal to the distance from the GPS sensor to the magnetometer sensor.
As in the use of surface magnetic surveys, applicable targets in marine applications are any ferrous objects of sufficient size depending on the measurement spacing or resolution. Additionally, gradiometric measurements, measurements where two or more sensors are used to remove the background magnetic field, can be acquired in both the vertical and horizontal planes. When applied in the horizontal plane it has been referred to as transverse gradiometry.
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