Enclosure for providing electromagnetic and magnetic shielding

Abstract

Equipment in an enclosure is shielded from affecting, or being affected by, external electromagnetic and magnetic fields. A flooring within the enclosure includes first and second portions. The first portion supports the enclosure walls and provides electromagnetic and magnetic shielding. The second portion is paramagnetic and is disposed inwardly of, and spaced from, the first portion. A third flooring portion disposed between the first and second portions and expansible with heat provides a compatible coupling with the first and second portions. A door in a wall aperture is movable between opened and closed positions. Resilient fingers on the door co-operate with the door jambs to provide an electromagnetic coupling between the door and the walls when the door is closed. A window in another wall aperture provides for a visual inspection of the enclosure and for electromagnetic coupling with the walls. A matrix arrangement of tubes extending through one wall provides for the introduction of air into the enclosure at temperatures different from ambient. The door, the resilient fingers, the window arrangement and the honeycomb of tubes provide a continuity of electromagnetic shielding in combination with the walls. The walls may also be defined by first and second spaced sheets and a material disposed in the space between the sheets anchors the sheets. Wall portions may extend at oblique angles from the opposite wall extremities to define extensions of the flow paths for the magnetic flux and to facilitate the flow of the flux in a closed loop.