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
CN110568384AActive Publication Date: 2019-12-13WUHAN INST OF PHYSICS & MATHEMATICS CHINESE ACADEMY OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
WUHAN INST OF PHYSICS & MATHEMATICS CHINESE ACADEMY OF SCI
Publication Date
2019-12-13

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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.
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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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