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Open-type magnetic field shielding device capable of adjusting at full frequency band

A shielding device and full frequency band technology, applied in the direction of magnetic/electric field shielding, active shielding, electrical components, etc., can solve the problems that the magnetic field regulator cannot be adjusted, unfavorable engineering practice, large volume ratio, etc., and achieve the effect that is beneficial to engineering practice

Active Publication Date: 2018-08-14
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these patented magnetic field regulators cannot adjust the DC magnetic field; secondly, because at least two coils are required, the volume ratio is large, which is not conducive to engineering practice

Method used

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  • Open-type magnetic field shielding device capable of adjusting at full frequency band
  • Open-type magnetic field shielding device capable of adjusting at full frequency band
  • Open-type magnetic field shielding device capable of adjusting at full frequency band

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Such as figure 1 As shown, this embodiment discloses a magnetic field shielding device, including: a magnetic field detection coil 1, a magnetic field detection coil 2, a magnetic field detection probe 3, a drive circuit 4, a magnetic field adjustment coil 5, and a sample stage 6 in addition to Shield the magnetic field7.

[0020] The magnetic field detection coil 1 is responsible for monitoring the change of the environmental magnetic field. The magnetic field detection coil 1 receives the signal detected by the magnetic field detection probe 3. The magnetic field detection coil will generate a voltage signal of U=dΦ / dt. The voltage signal of the detection coil is amplified by the drive circuit and then driven The magnetic field adjusting coil 5 cancels the external magnetic field 7 . In Embodiment 1, in order to obtain a shimming area as large as possible, the magnetic field adjustment coil 5 adopting a Helmholtz structure coil is a separate coil group structure, whi...

Embodiment 2

[0026] In embodiment 1, a single-directional magnetic field shielding structure is provided, and in embodiment 2, an open full-band magnetic field shielding device capable of shielding three-directional magnetic fields is provided. It uses three sets of orthogonal Helmholtz coils to form a magnetic field adjustment coil group, such as image 3 shown. Corresponding magnetic field detection coils, the magnetic field detection coils also need to be matched, which will not be repeated here.

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Abstract

The invention discloses an open-type magnetic field shielding device capable of adjusting at full frequency band, and belongs to the technical field of electromagnetic compatibility. The magnetic field shielding device comprise a magnetic field searching coil, a magnetic field detection oil, a driving circuit, a magnetic field adjustment coil and a corresponding matched sample table, wherein the magnetic field detection coil is used for monitoring change of an environmental magnetic field, the magnetic field adjustment coil is driven to offset with an external magnetic field by the driving circuit after a power is amplified, the magnetic field searching coil is placed right above the device, the sample table is placed in the center of the magnetic field adjustment coil, the magnetic fielddetection coil is connected with a magnetic field detection probe and is placed on the sample table, the driving circuit is placed at an outer side of the magnetic field adjustment coil, and a shielded magnetic field is arranged above the driving circuit. The magnetic field shielding device capable of adjusting at full frequency band is more beneficial for engineering practice.

Description

technical field [0001] The invention relates to the field of electromagnetic compatibility, in particular to an open magnetic field shielding device for full-frequency regulation, in particular to an open magnetic field shielding device for AC and DC full-frequency regulation. Background technique [0002] With the continuous development of human civilization, the electromagnetic environment is deteriorating day by day. Electromagnetic noise is especially serious around high-voltage lines, large electrical appliances, and large steel structures. Magnetic field cancellation is a common support technology for many precision sciences. In some extreme measurement environments: such as high-precision atomic clock electron beam imaging devices, mass spectrometers, medium and micro Widely referenced in subprobing. In some biomagnetic measurements, the signal to be tested is mostly at 10pT (1×10 -11 ) is even lower in magnitude. The environmental noise magnetic field is 3-6 order...

Claims

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Application Information

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IPC IPC(8): H05K9/00
CPCH05K9/0071
Inventor 顾晨
Owner TSINGHUA UNIV
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