A 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, which is a low-noise magnetic coil device especially suitable for ultra-high sensitive atomic magnetometers, atomic gyroscopes and other quantum precision measurement fields. The degaussing coil structure of the shielding barrel. The present invention is aimed at the composite magnetic shielding barrel composed of two different magnetic material magnetic shielding barrels. The shielding layers of the two different materials are separated and the degaussing coils are arranged separately, and then the degaussing lines are connected in series. In the shielding layer, synchronous degaussing replaces the commonly used solenoid degaussing coil or ring-wound degaussing coil. Among them, the circumferential and axial combined wiring is carried out for the inner ferrite shielding layer with low magnetic permeability that is not easy to demagnetize, which enhances the degaussing effect and solves the problem that the ferrite magnetic 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 bucket, and reduces the magnetic field gradient caused by the residual magnetism inside the magnetic shielding bucket.

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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