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Active magnetic compensation method for ultra-sensitive atom magnetometer

An atomic magnetic force, active technology, applied in magnetic field offset compensation, magnetic field size/direction, magnetic field measurement using magneto-optical equipment, etc., to achieve obvious effects and fast compensation speed

Active Publication Date: 2019-12-13
WUHAN INST OF PHYSICS & MATHEMATICS CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide an active magnetic compensation method for ultra-sensitive atomic magnetometers to solve the problems of power frequency magnetic field noise and static magnetic field noise.

Method used

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  • Active magnetic compensation method for ultra-sensitive atom magnetometer

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Embodiment Construction

[0031] In order to facilitate those of ordinary skill in the art to understand and implement the present invention, the present invention will be described in further detail below in conjunction with the examples. It should be understood that the implementation examples described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0032] Such as figure 2 As shown, an active magnetic compensation device includes a Helmholtz coil 1 , a magnetic measuring unit 2 , a supporting platform 3 , and a non-magnetic rotating platform 4 .

[0033] The Helmholtz coil 1 is used to generate a uniform magnetic field to compensate magnetic field noise in the external environment.

[0034] The magnetic measuring unit 2 is used to measure the magnetic field and magnetic field noise in the external environment in real time.

[0035] The supporting platform 3 is used to support the magnetic measuring unit 2 and fix it on the ...

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Abstract

The invention discloses an active magnetic compensation method for an ultra-sensitive atom magnetometer. The method comprises the steps as follows: a slope k and an intercept alpha fitted from a magnetic field value B<mag> and a linear change voltage V<lin> are obtained; the output voltage range, the damping factor and the sampling rate of a DAC conversion unit are set; and the amplitude |alpha<N>| and phase theta<N> of power frequency magnetic field noise are calculated, and the DAC conversion unit outputs a compensation voltage V'<N> to a voltage controlled current source module. The activemagnetic compensation method is suitable for static and power frequency magnetic field noise compensation and can also be used to compensate high-frequency magnetic field noise, and the limitations for the compensation effect are only the magnetic field resolution and the sampling rate of a magnetic measurement unit. Compared with a traditional PID magnetic compensation method, the compensation speed is higher, and the compensation effect is more obvious for power frequency magnetic field noise.

Description

technical field [0001] The invention belongs to the fields of software algorithm and precision magnetic measurement, and specifically relates to an active magnetic compensation method for an ultrasensitive atomic magnetometer, which is suitable for research in related fields such as atomic physics experiments, biomedicine, and precision measurement. Background technique [0002] Atomic magnetometer is an ultra-high sensitivity magnetic measuring tool comparable to superconducting quantum interference device (SQUID) and does not require a low temperature environment. According to some relevant literature reports, it has been applied to nuclear magnetic resonance (NMR). Measurement of magnetic resonance (NMR), magnetocardiography (MCG), magnetoencephalography (MEG), and magnetic materials. Generally, most atomic magnetometers use multilayer high magnetic permeability alloys to passively shield the magnetic field in the environment. However, passive shielding techniques and met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/032G01R33/00
CPCG01R33/0017G01R33/032
Inventor 周欣肖康达孙献平赵修超王力娄昕叶朝辉
Owner WUHAN INST OF PHYSICS & MATHEMATICS CHINESE ACADEMY OF SCI
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