Shield magnetic saturation performance test device and method in low-frequency pulsed high magnetic field environment

Abstract

The present invention discloses a shield magnetic saturation performance test device and method in a low-frequency pulsed high magnetic field environment. A low-frequency pulsed high magnetic field simulator control system is connected with a large-scale spiral coil to supply a pulse current to the large-scale spiral coil and form a pulsed high magnetic field around the large-scale spiral coil, adetected shield is arranged at the center position of the large-scale spiral coil, the detected shield is internally provided with a pulse magnetic field optical fiber measurement device, the pulse magnetic field optical fiber measurement devices are respectively arranged at the center of the large-scale spiral coil and the wave coming surface of the detected shield, the two pulse magnetic field optical fiber measurement devices are connected with a photoelectric converter located at the external portion of the large-scale spiral coil through optical fibers, the photoelectric converter is connected with a digital oscilloscope, and the photoelectric converter and the digital oscilloscope are encircled by employing a shielding measurement chamber. The shield magnetic saturation performance test device and method in a low-frequency pulsed high magnetic field environment can perform effective measurement of large-scale shield magnetic saturation efficiency, is true and reliable in measurement result, and can comprehensively and systematically analyze and estimate the magnetic saturation performance of the shield in the low-frequency pulsed high magnetic field environment.

Description

technical field [0001] The invention relates to the field of magnetic saturation performance testing, in particular to a device and method for testing the magnetic saturation performance of a shielding body in a low-frequency pulsed strong magnetic field environment. Background technique [0002] The magnetic saturation phenomenon is a physical state that appears after the ferromagnetic material is almost completely magnetized. The physical principle is that the magnetization direction of almost all spontaneous magnetic domains (which have reached the magnetic saturation state) inside the material is consistent with the external magnetic field. At this time, as the external magnetization field continues to increase, the internal magnetic induction of the material will hardly increase, and the shielding effect on the magnetic field will be significantly reduced. In the application of low-frequency pulsed strong magnetic field protection, shields made of ferromagnetic material...

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Problems solved by technology

When the magnetic field strength reaches the saturation magnetization field strength, the side wall of the shield reaches the saturation magnetic induction intensity. After that, when the magnetization field continues to increase, the increased magnetic field will disperse into the space, resulting in a decrease in the shielding performance of the shield.

However, in practical applications, the analysis of the static magnetic field cannot be directly applied to the pulsed magnetic field, because the pulsed magnetic field will produce an eddy current effect, which will offset part of the magnetic field at this

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