#Logitech options no devices detected install#
#Logitech options no devices detected series#

Navies use the deperming procedure, in conjunction with degaussing, as a countermeasure against this. This signature can be exploited by magnetic mines or facilitate the detection of a submarine by ships or aircraft with magnetic anomaly detection (MAD) equipment. It also picks up the magnetic orientation of the Earth's magnetic field where it is built. Ī sea-going metal-hulled ship or submarine, by its very nature, develops a magnetic signature as it travels, due to a magneto-mechanical interaction with Earth's magnetic field. The main advantage of the HTS Degaussing Coil system is greatly reduced weight (sometimes by as much as 80%) and increased efficiency. The system works by encircling the vessel with superconducting ceramic cables whose purpose is to neutralize the ship's magnetic signature, as in the legacy copper systems. The US Navy tested, in April 2009, a prototype of its High-Temperature Superconducting Degaussing Coil System, referred to as 'HTS Degaussing'.

#Logitech options no devices detected series#

A series of ever-increasingly complex coils were introduced to offset these effects, with modern systems including no fewer than three separate sets of coils to reduce the field in all axes. Additionally, the precise orientation of the field was also measured, something a simple bias field could not remove, at least for all points on the ship. This meant a degaussed ship with a magnetic 'hot spot' would still set off the mine. One of them, USS Deperm (ADG-10), was named after the procedure.Īfter the war, the capabilities of the magnetic fuzes were greatly improved, by detecting not the field itself, but changes in it. ĭuring World War II, the United States Navy commissioned a specialized class of degaussing ships that were capable of performing this function. To aid the Dunkirk evacuation, the British 'wiped' 400 ships in four days.

Smaller ships continued to use wiping through the war. Nevertheless, the bias did wear off eventually, and ships had to be degaussed on a schedule.

From then on captains were instructed to change direction as often as possible to avoid this problem. A more serious problem was later realized: as a ship travels through Earth's magnetic field, it will slowly pick up that field, counteracting the effects of the degaussing. It was originally thought that the pounding of the sea and the ship's engines would slowly randomize this field, but in testing, this was found not to be a real problem. This induced the proper field into the ship in the form of a slight bias. This procedure dragged a large electrical cable along the side of the ship with a pulse of about 2000 amperes flowing through it. Installing such special equipment was, however, far too expensive and difficult to service all ships that would need it, so the navy developed an alternative called wiping, which Goodeve also devised, and which is now also called deperming. British ships, notably cruisers and battleships, were well protected by about 1943. In addition to being able to bias the ship continually, coiling also allowed the bias field to be reversed in the southern hemisphere, where the mines were set to detect 'S-pole down' fields.

#Logitech options no devices detected install#

The original method of degaussing was to install electromagnetic coils into the ships, known as coiling. Since the Germans used the gauss as the unit of the strength of the magnetic field in their mines' triggers (not yet a standard measure), Goodeve referred to the various processes to counter the mines as 'degaussing'. Admiralty scientists, including Goodeve, developed a number of systems to induce a small 'N-pole up' field into the ship to offset this effect, meaning that the net field was the same as the background. The mines detected the increase in the magnetic field when the steel in a ship concentrated the Earth's magnetic field over it. Goodeve, Royal Canadian Naval Volunteer Reserve, during World War II while trying to counter the German magnetic naval mines that were wreaking havoc on the British fleet. The term was first used by then-Commander Charles F. Control panel of the MES-device ( 'Magnetischer Eigenschutz' German: Magnetic self-protection) in a German submarine