As an outcome of many inquiries for alternating and static field magnetic shielding from steel plants, industrial laboratories, hospitals and other facilities where higher than usual H-fields exist, we have been led to develop design changes toward high saturation flux density materials having "medium" (AD-MU-48) and "lower" (AD-MU-00/43) permeability instead of high nickel content alloys (AD-MU-80).

This evolution has been guided by cost effectiveness where fields of the order 10 oersted to 50 oersted intensity pervade control room areas and M.R.I. facilities.

Implementation has been by way of AD-MU-00/43 material. It is available mostly in sheet form with thickness of 0.025 inch and less. Use of this for high field shielding is made possible by laminating two or three layers of the thin material.

The laminated designs turn out to be more tolerant of field intensities of wide-ranging values than the high nickel alloy types; so we offer enclosures consisting of optimally spaced tri-lamina walls (two walls of triple layered AD-MU-00/43 0.025 inch). Such a shield for nineteen inch diagonal size industrial color display protection can perform well in the range of field intensities from 10 to 50 oersted, either static or alternating at power frequencies of 50 Hz. or 60 Hz., for example, a static (DC) field of 45 oersted would be brought down to 0.16 oersted near the center of the enclosure, (which is about one half the intensity of the earth’s magnetic field horizontal component in North America).

Magnetic shield adjustable overhang bezels are fitted, made from a single sheet thickness of high saturation nickel alloy, AD-MU-48. The AD-MU-48 is used for fabrication practicality to implement a radiused shape which optimizes bezel shield effectiveness.

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