Patent ID: 8552725
Filing Date: 2013-10-08
Classification: G01C,H05K,Y10T

Abstract:
1. An apparatus configured for substantially obstructing at least one magnetic flux path between an ambient space and a protected volume, the protected volume being capable of containing a navigation grade nuclear magnetic resonance gyroscope, the apparatus comprising: an inner shield, having at least one inner shield aperture extending therethrough in order to allow external access to the protected volume, the inner shield completely three-dimensionally enclosing the protected volume, with the exception of the at least one inner shield aperture, in order to prevent passage of magnetic flux to the protected volume; and an outer shield having at least one outer shield aperture extending therethrough in order to allow internal access from the ambient space, the outer shield completely three-dimensionally enclosing the inner shield, with the exception of the at least one outer shield aperture, in order to prevent passage of magnetic flux to the protected volume; wherein the apparatus is configured to impede magnetic flux between at least one inner shield aperture and at least one outer shield aperture in order to protect the navigation grade nuclear magnetic resonance gyroscope, when located in the protected volume, from magnetic fields, such that an orthogonal external magnetic field penetrates the apparatus to reach the protected volume at less than five parts per million of an applied internal magnetic field within the protected volume.