Shielding


Also found in: Dictionary, Thesaurus, Medical, Legal, Idioms, Wikipedia.
Related to Shielding: Radiation shielding

shielding

[′shēld·iŋ]
(electromagnetism)
(metallurgy)
Placing a nonconducting object in an electrolytic bath during plating to alter the current distribution.
(nucleonics)
Reducing the ionizing radiation reaching one region of space from another region by using a shield or other device.

Shielding

 

(also screening), in electrical engineering and radio engineering, a means of reducing—that is, of suppressing or substantially attenuating—the effect of external stray fields, noise, or pickup. Such phenomena interfere with the operation of, for example, electrical or radio equipment, data transmission equipment, and data-processing equipment.

Shielding is accomplished by means of a grounded metal or metal-plated shield with a high electrical or magnetic conductivity. Either the stray-field or noise source or the equipment or component to be shielded is enclosed in the shield. Depending on the extent of shielding required, either solid shields or screens are used. Solid shields are usually made of sheet steel; screens are woven from copper or steel wire.

In many cases, the metal housing of a device acts as a shield. Complicated or bulky equipment is often installed in a room or chamber that is shielded.

References in periodicals archive ?
Geographically, the medical radiation shielding market is dominated by North America, followed by Europe, Asia, and the Rest of the World.
Signals Defense, LLC, based in Owings Mills, Maryland, produces optically clear window film and building shielding technology that provides high radio frequency (RF) and infrared (IR) attenuation for RF shielding and thermal imaging defense purposes.
This way, although NOS shield is the better choice in terms of shielding effectiveness, the aluminium shield seems to be the optimum choice since it provides enough mitigation levels to comply the mitigation requirements with the lowest cost possible.
EMI shielding involves three mechanisms: reflection, absorption and multiple-reflection [9,10].
The shielding efficiency can be characterized by the shielding factor defined as the ratio of the magnetic field strength in shielded area [H.sub.1] and the magnetic field strength in the absence of shield [H.sub.2] in the same point of space.
As compared to silicone, the EMI shielding TPEs are suitable for normal thermoplastic processing methods.
1 and consists of the permalloy shielding (79 HM), the external coil system and the sensor systems with the stabilization electronics.
The major shielding options include: metal cabinets, conductive coatings (electroless plating, vacuum metallization and conductive paints), conductive plastics/elastomers, laminates/tapes as well as gaskets, metal sheet/foils, wire mesh, windows and connectors.
The honeypot should be deployed in a DMZ, and to maximize the deception value, it may replicate some or all of the non-confidential content of the server it is shielding. In the example of the Web server, this is merely a matter of mirroring some or all of the Web content to the honeypot.
of 3M Co., Austin, Texas, has a new EMI shielding material in formable sheet form, which can eliminate secondary coating steps.
Yet like the Tempest-equipment marketplace, shielding has seen demand slip since the 1988 change in national policy decreased overall Tempest requirements.
Shielding the equipment or worker from an ambient field may be very expensive due to the cost of shielding materials and related reconstruction of an area.