Degaussing coil device for ferrite-permalloy composite magnetic shielding barrel

Abstract

The invention discloses a degaussing coil device for a ferrite-permalloy composite magnetic shielding barrel, and is a degaussing coil structure of a low noise magnetic shielding barrel, which is especially suitable for an ultra-high sensitive atom magnetometer, an atom gyroscope and other quantum precision measurement fields. For a composite magnetic shield barrel formed by magnetic shielding barrels of two different magnetic materials, shielding layers of two different materials are separately subjected to degaussing coil arrangement, and then degaussing wires are connected in series together. The ferrite is located in a permalloy magnetic shielding layer for synchronous degaussing instead of a frequently used solenoid type degaussing coil or annular wound degaussing coil. The inner layer ferrite shielding layer with low permeability which is not easy to demagnetize is subjected to combined wiring of the circumferential and axial directions, which enhances the demagnetizing effect ofthe inner ferrite shielding layer and solves the problem that the ferrite shielding barrel is not easy to demagnetize. The coil structure provides a better demagnetization effect, reduces the residual magnetism after demagnetization of the composite magnetic shielding barrel, and reduces the magnetic field gradient caused by the residual magnetism inside the magnetic shielding barrel.

Description

technical field [0001] The invention relates to a degaussing coil device for a ferrite-permalloy composite magnetic shielding bucket, which belongs to the technical field of degaussing devices, and is particularly suitable for a low-noise magnetic shielding bucket composed of a permalloy shielding layer and a ferrite shielding layer degaussing. Background technique [0002] Ultra-sensitive atomic magnetometers, atomic gyroscopes and other quantum precision measurement fields are highly dependent on the magnetic field environment in which they are measured. High-performance magnetic shielding barrels are required to isolate external magnetic field interference and provide a stable magnetic field environment. Therefore, in order to achieve higher sensitivity, the proposed Based on the structure of the composite magnetic shielding barrel, a layer of ferrite magnetic shielding layer is added to the commonly used permalloy magnetic shielding barrel as the innermost layer, thus fo...

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Problems solved by technology

[0004] The problem solved by the present invention is: to overcome the existing conventional degaussing coil winding for the problem of large remanence and remanence gradient after the demagnetization of the composite magnetic shielding barrel composed of two materials, and provide a ferrite-permalloy The degaussing coil device of the composite magnetic shielding barrel can improve the degaussing effect on the ferrite-permalloy composite magnetic shielding barrel, reduce the remanence after degaussing and the internal magnetic field gradient of the shielding barrel caused by the remanence

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