Magnetics Business & Technology - November/December 2020 - 14

FEATURE ARTICLE

Buildup of Littoral Naval Forces Brings New Attention to Underwater Magnetic
Sensing
One of its magneto-resistive sensors is the RM3100 geomagnetic sensor, shown above, a military-grade sensor that has been
employed in a wide range of applications including drones, robotics, manned and unmanned vehicles, marine, scientific, defense,
and automotive.

The world's naval powers are beefing up their littoral combat
capabilities to protect and penetrate coastal waters, an effort that
is bringing fresh attention to magnetic sensing of submarines,
underwater mines and ships. On the other side of the equation
are advancements to degaussing systems designed to conceal
underwater magnetic signatures.
One company benefitting from the effort is PNI Sensor of Santa
Rosa, CA, a specialist in precision location, motion tracking and
fusion of sensor systems into real-world applications. Another
company serving the market is Polyamp of Sweden which makes
both magnetic mine sweep and vessel degaussing systems.
Other suppliers of naval degaussing systems include Wartsila
and L3Harris Technologies.

Polyamp, based in Sweden, specializes in power supplies and
products for naval magnetic signature management for the
global marine market. Its Systems Division manufactures magnet
mining for submarines as well as surface vessels, underwater
electronics, sensors and complete magnetic signature systems.
Products include ship degaussing systems that counteract mines
and torpedos, mine sweeps and sensors for measuring electric
fields underwater for both military and civilian applications. Its
Swecade software package, developed in collaboration with the
Swedish Defense Materiel Administration (FMV), has become an
important tool in prediction, design and evaluation of non-acoustic submarine signatures. It is used to predict a ship's magnetic
signature and design loops for mine protection.
According to Polyamp, modern mines affect ocean detecting
magnetic interference of a vessel in the earth's magnetic field,
this is called the ships magnetic signature. This signature is the
main influence of those used to trigger the sea mine or torpedo.
If the signature is detected and analyzed then the vessel is right
there and therefore it is the magnetic signal that becomes a trigger for torpedo or mining explosion or gives a position, mainly
submarine, and categorization.

Shown at top is the new littoral combat ship St. Louis built by
Lockheed-Martin that was delivered to the U.S. Navy in February. Designed to provide advanced capability in anti-submarine,
surface and mine countermeasure missions, it is one of several
littoral vessels the Navy has commissioned in recent years.
Lockheed-Martin also provides towed arrays for naval fleets.
PNI was recently awarded a contract by the U.S. Navy to
develop and provide high-performance magnetometers for the
Naval Undersea Warfare Center for use in towed-arrays. The
magnetometers will provide extremely high sensitivity and unparalleled signal-to-noise performance which are key parameters for
accurate heading in northern seas with dip angles of 85 degrees.
"Our magneto-inductive technology is proven across a wide
range of military applications," said Robin Stoecker, director of
marketing at PNI. "We're proud that the Navy has chosen PNI to
provide a new generation of high-performance magnetometers
for its towed-arrays."
The high-performance magnetometers are
based on the company's magneto-inductive
sensor technology which provides high resolution, low power consumption, no hysteresis,
large dynamic range, and high sampling
rates, all key to accurate calculation of heading and orientation.

14

Polyamp demagnetization equipment

To minimize this threat a vessel can be equipped with a built-in
degaussing system to neutralize its signature. Typically, 90-95%
of the ship's signature can be neutralized with a well-designed
3-dimensional DG system, says Polyamp, which has delivered
over 40 degaussing systems. It specializes in computer-controlled Advanced Degaussing Systems where each coil is individually controlled by a loop pole amplifier and the coil system is
three-dimensional. Its current versions are the company's third
generation of the demagnetization equipment.
Sea-operational priorities have shifted from blue water to brownshallow water, notes the company. This means that the threat
increases as ships arrive much closer to the influence mines.
Better demagnetization systems than previously used therefore
are now required, it says.

Magnetics Business & Technology * November/December2020

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Magnetics Business & Technology - November/December 2020

Table of Contents for the Digital Edition of Magnetics Business & Technology - November/December 2020

Magnetics Business & Technology - November/December 2020
Editor’s Choice/ Features
Paragraf Strides toward Commercializing Graphene- Based Hall Effect Sensors for Highly Precise Magnetic Measurement
Magnetics-Based Turboexpander Enables Energy Recovery from Pressure Letdown Stations in Natural Gas Pipelines
Buildup of Littoral Naval Forces Brings New Attention to Underwater Magnetic Sensing
Tech Tips
Embedding Magnetics Achieves Reliability & Consistency, Part 2 of 3
Product News
Industry News
Events Calendar/ Advertising Index
Visions
Magnetics Business & Technology - November/December 2020 - Magnetics Business & Technology - November/December 2020
Magnetics Business & Technology - November/December 2020 - Cover2
Magnetics Business & Technology - November/December 2020 - 3
Magnetics Business & Technology - November/December 2020 - Editor’s Choice/ Features
Magnetics Business & Technology - November/December 2020 - 5
Magnetics Business & Technology - November/December 2020 - Paragraf Strides toward Commercializing Graphene- Based Hall Effect Sensors for Highly Precise Magnetic Measurement
Magnetics Business & Technology - November/December 2020 - 7
Magnetics Business & Technology - November/December 2020 - Magnetics-Based Turboexpander Enables Energy Recovery from Pressure Letdown Stations in Natural Gas Pipelines
Magnetics Business & Technology - November/December 2020 - 9
Magnetics Business & Technology - November/December 2020 - 10
Magnetics Business & Technology - November/December 2020 - 11
Magnetics Business & Technology - November/December 2020 - 12
Magnetics Business & Technology - November/December 2020 - 13
Magnetics Business & Technology - November/December 2020 - Buildup of Littoral Naval Forces Brings New Attention to Underwater Magnetic Sensing
Magnetics Business & Technology - November/December 2020 - 15
Magnetics Business & Technology - November/December 2020 - Embedding Magnetics Achieves Reliability & Consistency, Part 2 of 3
Magnetics Business & Technology - November/December 2020 - 17
Magnetics Business & Technology - November/December 2020 - 18
Magnetics Business & Technology - November/December 2020 - 19
Magnetics Business & Technology - November/December 2020 - Product News
Magnetics Business & Technology - November/December 2020 - 21
Magnetics Business & Technology - November/December 2020 - 22
Magnetics Business & Technology - November/December 2020 - 23
Magnetics Business & Technology - November/December 2020 - Industry News
Magnetics Business & Technology - November/December 2020 - 25
Magnetics Business & Technology - November/December 2020 - 26
Magnetics Business & Technology - November/December 2020 - 27
Magnetics Business & Technology - November/December 2020 - Events Calendar/ Advertising Index
Magnetics Business & Technology - November/December 2020 - 29
Magnetics Business & Technology - November/December 2020 - Visions
Magnetics Business & Technology - November/December 2020 - Cover3
Magnetics Business & Technology - November/December 2020 - Cover4
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