Importance

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Abstract

A magnetically shielded enclosure provides a shielded environment having very low, constant levels of magnetic and electrical signals resulting from external sources, so that the magnetic signals produced by the body of a person in the enclosure can be measured in the absence of outside interference. The walls of the enclosure include concentric layers of a superconducting material and a material that is electrically and thermally conductive, and the person and magnetic measurement apparatus are enclosed therein. The superconducting layer is preferably supported on, and in thermal contact with, the conductive layer, and is cooled to a temperature below its superconducting transition temperature by cooling the conductive layer. Optionally, a magnetic cancellation field is applied prior to transforming the superconducting material to the superconducting state or otherwise sealing the enclosure, to zero the internal magnetic field.

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First Claim