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Topic: Electrostatic shielding

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	Electrostatic, ESD testing services, static decay, resistivity & resistance, voltage suppression
		Two versions of this test are currently performed to evaluate the electrostatic shielding characteristics of metallized film.
		The relative electrostatic shielding characteristics of static shielding material is determined by the Capacitive Probe Test currently specified in EIA-541 and referenced in Mil-B-81705C and ESD S11.31.
		The purpose of the test is to evaluate the ability of a container to shield the contents from a direct electrostatic discharge.
	www.electrotechsystems.com /esd.htm (1332 words)

	faraday cage - Article and Reference from OnPedia.com
		This shielding effect is used to eliminate electric fields within a volume, for example to protect electronic equipment from lightning strikes and other electrostatic discharges (ESDs).
		The same effect was predicted earlier by Francesco Beccaria (1716–1781) at the University of Turin, a student of Benjamin Franklin's work, who stated that "all electricity goes up to the free surface of the bodies without diffusing in their interior substance".
		Since the electrostatic field equations are linear, this means that even if there are charges in the box to generate a field, they will still not be affected by any fields outside the box.
	www.onpedia.com /encyclopedia/Faraday-cage (564 words)

	Electrostatic shielding sheet for making a box used for shipping and storing electronic components and a shipping box ...
		Electrostatic discharges may cause a total failure of the device and even worse they may lead to latent failures which reduce the reliability and the functionality of the circuits.
		This fl conductive coated cardboard does not meet all the requirements needed from a safe electrostatic shielding packaging; it may cause contamination of the circuits by conductive Carbon fl particles which may be deposited on the circuits during the handling of the circuits and the boxes as well as malfunctions.
		The surface resistivity of this electrostatic shielding 16 is between 1.times.10.sup.2 Ohm/sq and 1.times.10.sup.3 Ohm/sq.
	www.freepatentsonline.com /5354950.html (1784 words)

	Galileo spacecraft - Wikipedia, the free encyclopedia
		After the Challenger accident, a study considered additional shielding and eventually rejected it, in part because such a design significantly increased the overall risk of mission failure and only shifted the other risks around (for example, if a failure on orbit had occurred, additional shielding would have significantly increased the consequences of a ground impact).
		The shielding is accomplished by means of a 10 mm thick layer of tantalum surrounding the CCD except where the light enters the system.
		Inside the heat shield, the scientific instruments were protected from ferocious heat during entry.
	en.wikipedia.org /wiki/Galileo_probe (4977 words)

	Coaxial Electrostatic Shielding Apparatus
		What this important exercise demonstrates is that the electrostatic charge shielding ability of a conducting vessel enclosing charged material depends on the vessel being connected to ground.
		The same shielding effect is observed despite the fact that the conducting threads are widely spaced in the fabric.
		Electrostatic shielding can be demonstrated with the antistatic bags used to protect sensitive electronic chips and assembled boards.
	www.ece.rochester.edu /~jones/demos/coaxshield.html (710 words)

	EMI Shielding RF Shielding - Glossary
		- A type of shielded room or enclosure in which the inner wall is isolated from the outer wall except in the region of where power-line filters and coaxial connectors penetrate.
		The measurement is the ratio of the signal received without the shield to the signal received inside the shield.
		Shielding materials are always metals, metalized plastics (conductive coatings) or conductive composites.
	www.tech-etch.com /shield/glossary.html (1927 words)

	Probing the electrostatic shielding of DNA with capillary electrophoresis Biophysical Journal - Find Articles
		Probing the electrostatic shielding of DNA with capillary electrophoresis
		The results suggest that the electrostatic shielding of DNA is determined not only by the relative concentrations of the various ions in the solution, but also by their equivalent conductivities.
		A convenient method of measuring the electrostatic shielding of DNA, and the changes in electrostatic shielding caused by changes in electrolyte concentration, is to determine the free solution mobility using capillary electrophoresis (Stellwagen and Stellwagen, 2002).
	www.findarticles.com /p/articles/mi_qa3938/is_200303/ai_n9193779 (903 words)

	PhysOrgForum Science, Physics and Technology Discussion Forums -> Radaition Shielding and Ion Drives
		Magnetic Shielding, which is weak at some points, much like the Earth is. It also requires a strong magnetic field of about 20 teslas, which might have its own ill effects, we don't know yet.
		Electrostatic Shielding, by giving the hull a positive charge of 2 billion volts or so, you can repel cosmic-ray protons.
		The standard electrostatic shielding concept has the drawback of causing particle bombardment due to its field radius in space around the ship.
	forum.physorg.com /index.php?showtopic=5696&view=getlastpost (2590 words)

	Rex Power Magnetics - Product Page: Electrostat Transformers
		Electrostatically (faraday) sheilded transformers are designed to protect sensitive electrical and electronic devices and systems from high frequency voltages (electrical noise) or transients that occur due to switching and loading on distribution lines.
		The grounded shield provides a low resistance path to ground by the effect of capacitive coupling which prevents high frequency signals presnt in the source voltage from reaching the secondary of the transformer and subsequently the connected load.
		By redirecting unwanted commom mode electrical noise and transients generated on the source side of the transformer to ground the shield is extremely valuable in protecting sensitive equipment connected to the transformer output.
	www.rexpowermagnetics.com /products/product_electrostat.html (342 words)

	Magnetic Radiation Shielding: An Idea Whose Time Has Returned? - G.Landis (1991)
		The concept of magnetic shielding using superconducting coils for space vehicles was first discussed by Levy [2] and analyzed in some detail in the 1960's and early 1970's [3,4,5,16,17], but was not pursued, primarily because there were no plans for long-duration manned flights which would benefit from such a shield.
		Magnetic radiation shielding received a brief resurgence of attention in the late 1970's, when the concept of large space colonies was introduced by O'Neill, as an alternative to simple mass shielding for the large populations envisioned [6,7].
		A solution proposed by Levy and Janes [10, 11] is a hybrid of the magnetic shield and the electrostatic shield, the "plasma shield." An electrostatic charge is applied to the vehicle (or habitat) shell to repel the positively charged radiation; a magnetic field then prevents the plasma electrons from discharging the vehicle.
	www.islandone.org /Settlements/MagShield.html (2395 words)

	Calmont Wire and Cable - EMI Shield (Site not responding. Last check: 2007-11-06)
		Electromagnetic frequency shielding provides protection for the input signal that is susceptible to magnetic field induction, as well as to electrical fields, until the signal is safely within the desired electrical or electronic equipment, as ia illustrated in Fig.
		If the shielding is to be utilized to prevent electromagnetic interference from signals present in wires, then the inner layer should be of low permeability braid and the outer layer of high permeability braid.
		Shields can also be configured with a low permeability shield on the inside and out with with high permeability shields in between.
	www.calmont.com /EMIShield.htm (475 words)

	Static Control and ESD Glossary (Site not responding. Last check: 2007-11-06)
		Electrostatic Discharge Protective Workstation - An area that is constructed and equipped with the necessary protective materials and equipment to limit damage to electrostatic discharge susceptible items handled therein.
		Electrostatic Discharge Shield - A barrier or enclosure that limits the passage of current and attenuates an electromagnetic field resulting from an electrostatic discharge.
		Electrostatic Discharge Susceptibility (sensitivity) (ESDS) - The propensity to be damaged by electrostatic discharge.
	www.staticpros.com /glossary.html (4242 words)

	Radiation Shields and Ion Drives
		Magnetic Shielding, which is weak at some points, much like the Earth is. It also requires a strong magnetic field of about 20 teslas, which might have its own ill effects, we don't know yet.
		A magnetic shield idea is good, and people have looked into that. To create a magnetic field around the ship, you need to crate an electric current, but that can be done in a super-conducting magnet and not consume much power after it is initially powered up.
		I also use material shielding as part of the hull design, but it takes a lot of material shielding to have an noticable effect, 5 meters of water would be needed to provide the min.
	www.thespacerace.com /forum/index.php?topic=1278.0 (3557 words)

	Midwest Chapter, ESD Association
		Electrostatic shielding protects components and assemblies from failures caused by field induced energy.
		In the past, it was thought that electrostatic fields were a major cause of component and circuit card failures, so conductive materials that offered field protection were generally prescribed for ESD packaging.
		Electrostatic fields in close proximity to an unpacked circuit card serve as a source for charging a component or assembly.
	www.midwestesd.org /pkgart1.html (1024 words)

	Glossary for Electromagnetic Interference (EMI) Shielding (Site not responding. Last check: 2007-11-06)
		Firmly connecting together various elements, shields or housings of a device to prevent potential differences and possible interference.
		Faraday Shield — A network of parallel wires connected to a common conductor at one end to provide electrostatic shielding without affecting electromagnetic waves.
		Shielding Effectiveness — The relative reduction of radiated electromagnetic energy levels occasioned by the use of an enclosure either to contain or exclude the energy.
	www.vactecinc.com /glossary.htm (1771 words)

	(EMI Field Notes) Shielding Against Electrostatic Discharge (MDDI archive, Dec 98)
		Electrostatic discharge (ESD), although troublesome for portable electronic medical devices, is controllable with effective shielding.
		Shielding is the next step in protecting unavoidable exposed metal surfaces.
		First, if full shielding is not possible, then providing a ground plane to which cable shields and filters can be referenced is mandatory.
	www.devicelink.com /mddi/archive/98/12/005.html (1215 words)

	Uline: Glossary
		When an electrostatic charge transfers between objects of different electrostatic potential.
		An electrically continuous, conductive enclosure which provides electrostatic shielding.
		Wave shapes pressed into the middle of the corrugated wall of the box.
	www.uline.com /Glossary.asp (582 words)

	ESD Journal - ESD Bags
		Shielding bags serve two purposes, preventing the ESD sensitive components sealed within the bag from charging up via field induction and minimizing the damage from a direct contact (outer bag surface) with an ESD event.
		This shows that metallized shielding bags are the most protective when first used, but as used they degrade to provide ESD protection similar to good as antistatic bubble wrap bags.
		Dissipative and metallized shielding bags are made with volume loaded polyethylene which cannot be washed off and is inherent in the film.
	www.esdjournal.com /techpapr/ryne/esdbags.htm (2955 words)

	Photomultiplier Housing Shielding - Products for Research Inc.
		The saturation induction of this alloy is 7500 gauss.
		Finally, the shield is designed to extend the recommended distance of 1/2 the cathode diameter in front of the photocathode.
		This technique also allows the shield to be put at the potential on one of the dynodes as some research seems to indicate is desirable.
	www.photocool.com /shields.htm (409 words)

	Public Lessons Learned Entry: 0685
		Electrostatic controls are implemented at KSC to reduce the effects of ESD during the following operations:
		A good example of electrostatic field is when a person generates a charge on a balloon and then holds it above his head to make his hair stand up.
		Electrostatic Potential - the amount of energy (work) per unit charge required to move a charge from one point to another in a field.
	www.nasa.gov /offices/oce/llis/0685.html (2177 words)

	Radaition Shielding and Ion Drives
		Electrostatic Shielding, by giving the hull a large positive charge, you can repel cosmic-ray protons.
		As we are using the electrostatic system to generate the magnetic field, there is little to no increase in mass and energy requirements for the added protection.
		So by combining all three shielding concepts into a single design concept, an overall reduction in mass and energy requirements for protection from cosmic radiation can be achieved.
	www.physics-philosophy-metaphysics.com /forum/radaition-shielding-and-ion-drives-vt416.html (3654 words)

	Precision Converting-carries an extensive line of shielding and foil conductors
		The PC 300 series is a "Cuffed" shield or conductor, consisting of a foil strip partially enclosed in a polyester adhesive film.
		The PC 300 "Cuffed" series is one of the most widely recognized foil shielding designs at work in the transformer industry, yet until recently it was hand fabricated, in house, at significant cost.
		The shielding solution has created a special niche among toroidal transformer manufactures, where it is used as a safety, grounding or electrostatic shield.
	www.precisionconverting.com /sandfconductors.htm (1520 words)

	Glossary
		An electrostatic fieldmeter is a device designed to measure the magnitude of this field.
		An electrostatic field meter is a device designed to measure the magnitude of this field.
		Using an electrostatic field meter, it would seem that the charge on the bag disappears as it is placed on the bench.
	www.national.com /appinfo/eosesd/glossary.htm (5019 words)

	Application notes on Pearson current monitors.
		The shield and the coaxial cable braid are grounded by the mounting screws in all models except those having a 2-inch diameter hole.
		Since the mounting screws ground the outer shield, a direct path to ground is provided for possible arcs from the high-voltage conductor to the case.
		The inner shield and coaxial connector are “floating” and hence can be grounded at the oscilloscope, at the oil tank bulkhead, or wherever convenient to minimize ground loops and promote safety.
	www.pearsonelectronics.com /Pages/Application_notes.html (2258 words)

	Electrostatic Discharge Bags - ... - browndischarge.massforsale.be (Site not responding. Last check: 2007-11-06)
		Electrostatic discharge (ESD) may seem to be a new problem because of the electronics...
		electrostatic discharge is provided by packaging materials such as bags,...
		Hidden sources of electrostatic discharge, from hospital-room furniture to pocketed...
	browndischarge.massforsale.be /.../electrostatic-discharge-bags.html (341 words)

	ESD Control/Prevention - Page 4 of 4
		ESD-protective packaging materials must: 1) be dissipative; 2) exhibit low triboelectric charging tendency; and 3) have the ability to shield their contents from electrostatic fields.
		Electrostatic shielding attenuates electrostatic fields on the surface of a package in order to prevent potential differences from being developed inside the package.
		Electrostatic shielding is provided by materials that have a surface resistance equal to or less than 1.0 x 10
	www.siliconfareast.com /esdcontrols4.htm (391 words)

	Course 161 Grounding and Shielding Techniques for EMI, EMC and ESD
		Applications In modern electronics, as component size continues to decrease and complexity to increase, electrostatic and magnetic fields and their interactions are becoming increasingly important.
		For Whom Intended This course is intended for individuals whose work requires an understanding of the effects of interacting electrostatic and magnetic fields on electrical and electronic equipment.
		Electrostatic Discharge (ESD) will be covered as it relates to equipment design.
	www.ttiedu.com /161cat.html (480 words)

	Embedded Forum Home - ESD bag types and standards (Site not responding. Last check: 2007-11-06)
		In general, a metallized shielding bag may still shield if it has crinkled or acquired small holes because of the Faraday affect, but it is safer to discard these bags and err on the conservative side.
		A shielding bag has a layer of metal, usually aluminum (Al) (similar to Aluminum foil), that provides "shielding" producing a Faraday Cage affect.
		ELECTRICAL SHIELDING: (Faraday cage) to minimize an electrical current (voltage discharge) or ElectroStatic Discharge (ESD) from penetrating the film thereby "protecting" the contents from being damaged by an ESD.
	www.innovative-research.com /cgi/yabb/YaBB.cgi?board=Bags;action=display;num=1093391509 (2646 words)

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