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Degaussers Presentation by Ben Sheron Daniel Pulito Jeffrey - PowerPoint PPT Presentation

Aug 16, 2022 •440 likes •540 views

Degaussers Presentation by Ben Sheron Daniel Pulito Jeffrey Abbott Ryan Toukatly History Term degausser first coined by Cmdr. Charles Goodeve in WWII Navy ships would become magnetized while traveling through the earth's

  1. Degaussers Presentation by Ben Sheron Daniel Pulito Jeffrey Abbott Ryan Toukatly

  2. History � Term ”degausser” first coined by Cmdr. Charles Goodeve in WWII � Navy ships would become magnetized while traveling through the earth's magnetic field � In addition to causing problems with compasses and other navigational equipment it put the ship at risk of setting off German mines � Goodeve devised a simple coil system to cancel out the ship's magnetic field

  3. Theory � In applications such as CRTs a deguasser generally consists of a coil along with a thermister � As the coil heats up, so does the thermister � The resistance increases, decreasing the current as well as the magnetic field

  4. Theory

  5. Theory μ ˆ μ I NI = = 0 0 ˆ B a B a φ 2 π z r l Magnetic caused by straight Magnetic caused by current line of current through a coil, a solenoid

  6. Theory Magnetic dipoles in magnetic material Magnetic field aligns the magnetic dipoles in the same orientation Magnetic dipoles after Degaussing has occurred

  7. Applications � Naval ships � CRT monitors � Erasing data by randomizing the domains on magnetic media such as hard disk drives and magnetic tape � In some cases the degausser is used to destroy the media permanently

  8. Sources � http://www.gaussbusters.com/ppm93.html � http://www.vectorsite.net/tpqm_04.html � http://www.epcos.com/inf/55/db/ptc_06/Degaussing __Double__Mono__T__B59______T.pdf � http://en.wikipedia.org/wiki/Degaussing

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