A demagnetization method for a multi-layer shielding device

Abstract

The invention relates to a demagnetization method for a multilayer shielding device. The demagnetization method is based on a demagnetization coil system to realize demagnetization. The demagnetization coil system includes a multi-turn demagnetization coil, a plurality of connecting wires and a power supply module; the multilayer shielding device includes at least two layers of shielding bodies, Each layer of shielding body is set layer by layer from the inside to the outside, and each layer of shielding body is wound with multiple turns of demagnetization coils at intervals. Half of each turn of demagnetization coil is located inside the wound shield body, and the other half is located outside the wound shield body; The demagnetization coils are all connected to the power supply module through the corresponding connecting wires; the power supply module includes a controller, and the controller is connected to each connecting wire; the demagnetization method includes: passing a corresponding demagnetization current to each demagnetization coil, so that the shielding body of each layer is turned from the inside to the Demagnetize layer by layer from the outside, and then demagnetize layer by layer from the outside to the inside. The intensity of the demagnetization current is set according to the size of the shielding body of each layer. Compared with the existing demagnetization method, the method can effectively improve the demagnetization effect.

Description

technical field [0001] The invention relates to the field of magnetic field shielding technology, in particular to a demagnetization method for a multilayer shielding device. Background technique [0002] The shielding device can shield the external geomagnetic field and environmental interference magnetic field, and provide an absolute magnetic field and its weak magnetic field environment. The development of various directions such as aerospace engineering, national defense industry, space science, life science, and basic physics have put forward application requirements for shielding devices, and with the deepening of research, the requirements for the internal magnetic field environment of shielding devices have continued to increase in recent years. [0003] The residual static magnetic field in the shielding device is a direct indicator to measure the degree to which its near-zero magnetic field is close to the true zero magnetic field, and it is expressed by the magni...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a demagnetization method for multi-layer shielding devices based on at least some of the above defects, so as to solve the problem that it is difficult to achieve complete demagnetization of multi-layer shielding devices in the prior art

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