A self-centering magnetic shielding device with automatic opening and closing

Abstract

The invention discloses an automatic opening and closing self-centering magnetic shielding device, which specifically includes a pneumatic drive unit, a self-centering cover unit, and a magnetic shielding cavity. The pneumatic drive unit is connected with the self-centering cover unit to drive the self-centering The center cover unit rotates to realize the automatic opening or closing of the magnetic shielding device; the self-centering cover unit includes a cover body, a driving force arm, a horizontal and vertical adjustment mechanism arranged on the cover body, one end of the driving force arm and a pneumatic drive The unit is connected, and the other end is rotatably connected with the cover body to realize the rotation of the cover body around the driving force arm; the vertical and horizontal degrees of freedom of the cover body are realized through the horizontal and vertical adjustment mechanism; the cover body is closed with the magnetic shielding cavity An inward guide bevel is set at the position, and the self-centering of the self-centering cover unit and the magnetic shielding cavity is realized through the guide bevel, rotational degree of freedom, horizontal and vertical degrees of freedom. The invention has the advantages of compact structure, convenient control and good magnetic shielding effect.

Description

technical field [0001] The invention relates to the field of magnetic shielding, in particular to an automatic opening and closing self-centering magnetic shielding device. Background technique [0002] Optically pumped magnetometers based on the spin-exchange-free relaxation (SERF) principle are a class of quantum sensors with ultra-high magnetic field measurement sensitivity. Since the magnetic measurement sensitivity of this type of sensor is extremely high (fT order), its measurement range is relatively small, so its test environment needs to be guaranteed in a near-zero magnetic environment free from external magnetic field interference. This magnetic shielding device is also used in This demand arises, in order to ensure the high performance of the magnetic shielding device, the requirements for its material, process and assembly are relatively high. [0003] In order to ensure its performance, the magnetic shielding device used in general testing and research has hig...

AI Technical Summary

Problems solved by technology

This will introduce some problems: first, it will cause inconvenience for researchers to operate the shielding device (a total of one layer of aluminum alloy cover and four layers of high magnetic permeability material cover need to be installed from the outside to the inside); The center will introduce assembly stress, resulting in changes in the magnetic properties of the high magnetic permeability material, thereby affecting the magnetic shielding performance of the magnetic shielding device (the magnetic shielding device is generally a columnar structure, and the axial direction is the direction where the magnetic shielding is the weakest); third, During normal use, the degaussing wire needs to be concealed in the magnetic shielding device, so it is necessary to pull the degaussing wire out of the device for degaussing outside the device every time it is degaussed, and the operation is cumbersome; Operational factors, highly influenced by the tester, poor test repeatability

[0004] Judging from the current field of magnetic field weakening research, none of the magnetic shielding devices used in the research is realized in an automated way. The main difficulties are as follows: First, the automation equipment will introduce additional electromagnetic noise, making the magnetic shielding device outside The environment becomes worse; second, in order to ensure the magnetic shielding effect, the magnetic shielding cover is generally composed of four layers of high magnetic permeability material, which will increase the difficulty of the design of the switch cover; third, in order to ensure the magnetic shielding performance, the tolerance and matching requirements of the cover and the main body Higher, it is difficult to guarantee the fit clearance after automation

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