Composite gradient erasing structure, magnetic shielding cabin and composite gradient erasing method

CN121938751BActive Publication Date: 2026-06-09杭州极弱磁场国家重大科技基础设施研究院

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Patents(China)
Current Assignee / Owner: 杭州极弱磁场国家重大科技基础设施研究院
Filing Date: 2026-03-26
Publication Date: 2026-06-09

AI Technical Summary

Technical Problem

In the prior art, the uneven magnetic field distribution at the opening end of the single-ended cylindrical magnetic shielding chamber leads to the coupling of external magnetic fields, causing magnetic field distribution distortion and remanent magnetic gradient problems. Existing uniform demagnetizing coils cannot effectively solve the problems of insufficient demagnetization at the opening end or excessive demagnetization inside.

Method used

A composite structure of axial and circumferential demagnetizing coils is adopted. The axial demagnetizing coils are arranged along the axial direction of the magnetic shielding chamber, and the density of the circumferential demagnetizing coils gradually increases from the closed end to the open end, forming an asymmetric gradient demagnetizing magnetic field. Combined with the circumferential gradient demagnetizing magnetic field generated by the axial demagnetizing coils, a composite demagnetizing magnetic field is constructed to match the residual magnetism distribution.

Benefits of technology

It achieves precise and adaptive demagnetization from the closed end to the open end, reduces the residual magnetism in the open area, expands the uniform magnetic field area inside the magnetic shielding chamber, avoids the problems of over-demagnetization or insufficient demagnetization, and improves the uniformity of magnetic field distribution.

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Abstract

The present application relates to the technical field of magnetic shielding, and discloses a composite gradient demagnetization structure, a magnetic shielding cabin and a composite gradient demagnetization method. The composite gradient demagnetization structure provided by the present application sets the distribution density of the circumferential demagnetization coil to gradually increase from the closed end to the open end, and combines the axial demagnetization coil to actively construct an asymmetric composite demagnetization magnetic field with the strength gradually increasing from the closed end to the open end, so as to compensate for the non-linearly increasing residual magnetism distribution from the closed end to the open end caused by the discontinuity of the magnetic circuit, solve the contradiction between the existing uniform demagnetization magnetic field and the uneven residual magnetism distribution, and realize accurate and adaptive demagnetization of the shielding cabin from the closed end to the open end.

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