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Environmental noise suppression method and equipment

A technology of environmental noise and equipment, applied in the field of weak magnetic detection, can solve the problems of high complexity and inability to obtain the first-order gradient, and achieve the effect of simplifying the detection structure and improving the noise suppression performance

Active Publication Date: 2016-08-17
上海理微医疗科技发展有限公司
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Problems solved by technology

[0007] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide an environmental noise suppression method and equipment, which is used to solve the problem that the synthetic gradient noise suppression method in the prior art has high complexity and cannot obtain reliable first-order gradients

Method used

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  • Environmental noise suppression method and equipment

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Embodiment 1

[0042] Compared with the traditional method, the environmental noise suppression method provided in this embodiment does not need to increase the first-order gradient reference quantity of the environmental magnetic field separately, and uses a gradiometer consistent with the preparation process and detection quantity of the detection channel as a reference, placed in the horizontal In the direction, the correlation characteristics of the gradiometer's own response are used to compensate, so as to achieve efficient noise suppression performance.

[0043] This embodiment provides an environmental noise suppression method, which is applied to environmental noise suppression equipment, and the environmental noise suppression equipment includes a detection gradient component, a reference gradient component, a three-axis magnetometer component of a superconducting quantum interference device, readout circuit. In this embodiment, a SQUID (SuperconductingQuantum Interference Device) ...

Embodiment 2

[0050] This embodiment provides an environmental noise suppression device 10, please refer to image 3 , which is a schematic structural diagram of an environmental noise suppression device in an embodiment. Such as image 3 As shown, the environmental noise suppression device 10 includes:

[0051] A non-magnetic Dewar 1 with an accommodating space. See image 3 , the non-magnetic Dewar 1 includes a non-magnetic Dewar plug 11 and a low-temperature connection seat 12, the non-magnetic Dewar plug 11 is used to seal the non-magnetic Dewar to form a closed space.

[0052] The detection gradient assembly 2 and the reference gradient assembly 3 are placed in the inner space of the non-magnetic Dewar 1 . In this embodiment, the detection gradient assembly 2 is composed of a detection gradient coil 21 and a detection superconducting quantum interference device 22 . The reference gradient assembly 3 is composed of a reference gradient coil 31 and a reference superconducting quantu...

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Abstract

The present invention provides an environmental noise suppression method and equipment. The environmental noise suppression equipment comprises a detection gradient component, a reference gradient component, a superconducting quantum interference device triaxial magnetometer component, and a readout circuit. The environmental noise suppression method comprises a step of collecting a first gradient output signal from the detection gradient component and a second gradient output signal from the reference gradient component, a step of using the superconducting quantum interference device triaxial magnetometer component to compensate the detection gradient component and the reference gradient component, and a step of allowing the first gradient output signal and the second gradient output signal to mutually compensate so as to synthesize a two-dimensional gradient to suppress environmental noise. According to the invention, the single adding of a gradient reference amount is not needed, by using the associated characteristic between preparation process, the gradient synthesis is carried out in the two-dimensional gradient, thus the noise suppression performance of a gradiometer is greatly improved, and a system detection structure is simplified.

Description

technical field [0001] The invention belongs to the technical field of weak magnetic detection, and in particular relates to an environmental noise suppression method and equipment. Background technique [0002] As a highly sensitive magnetic sensor, Superconducting Quantum Interference Device (SQUID) is widely used in weak magnetic detection fields such as biomagnetism, low-field nuclear magnetic resonance, geophysics, and nondestructive testing [PROCEEDINGS OF THE IEEE, VOL.92, NO.10, 1534-1548]. [0003] One of the main challenges for SQUID weak magnetic detection is to suppress strong ambient magnetic fields. Taking biomagnetic signals as an example, the typical intensity of heart magnetism and brain magnetism is divided into tens of pT and hundreds of fT, while the environmental magnetic field is very strong. up to hundreds of nT. In order to effectively suppress the ambient magnetic field, in addition to the high-performance magnetic shielding room, the SQUID hardwa...

Claims

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Application Information

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IPC IPC(8): G01R33/00G01R33/035
CPCG01R33/0029G01R33/007G01R33/0354
Inventor 张树林张朝祥谢晓明
Owner 上海理微医疗科技发展有限公司
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