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Weak magnetic field vector measurement method based on atomic magnetometer

A technology of atomic magnetometer and weak magnetic field, which is applied in the use of magneto-optical equipment for magnetic field measurement, the size/direction of the magnetic field, etc., can solve problems such as difficult to meet the high-precision measurement of the magnetic field vector, and achieve the effect of no working blind area

Active Publication Date: 2020-04-10
SHANDONG INST OF AEROSPACE ELECTRONICS TECH
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Problems solved by technology

[0003] Traditional vector magnetometers include superconducting quantum interference device magnetometers (SQUID), magnetoresistive magnetometers, fluxgate magnetometers, etc. These magnetometers are assembled from three single-axis sensors into three-axis vector sensors. , there is an inevitable quadrature error, which is difficult to meet the needs of high-precision measurement of the magnetic field vector

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  • Weak magnetic field vector measurement method based on atomic magnetometer
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  • Weak magnetic field vector measurement method based on atomic magnetometer

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Embodiment Construction

[0015] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0016] Such as figure 1 The described weak magnetic field vector measurement system based on the atomic magnetometer includes

[0017] Lasers, semiconductor lasers or fiber lasers, provide linearly polarized laser light for polarizing atoms; the frequency stabilization module is used to suppress the movement of its center frequency, and the temperature control module is used to maintain the constant temperature state required for the laser to work.

[0018] Polarization direction rotator: used to control the polarization direction of the laser, different control voltages correspond to different polarization directions of the output laser.

[0019] Atomic gas cell: A cubic or cylindrical glass device sealed with alkali metal or helium atoms, which is the magnetica...

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Abstract

The invention relates to a weak magnetic field vector measurement method based on an atomic magnetometer, and the method comprises the steps: a linearly polarized laser outputted by a laser passes through a polarization direction rotator, and the polarization direction of the laser is controlled; an atomic gas chamber is arranged in a direction-controllable radio frequency magnetic field, and after the linearly polarized laser penetrates through the atomic gas chamber, transmission light is detected by the photoelectric detector; the sizes of different frequency signals acquired by the photoelectric detector depend on an included angle between an external magnetic field and a laser polarization direction; the size and direction of a magnetic field are obtained by resolving direct-currentcomponent, first-harmonic component and second-harmonic component signals of a transmission light signal during magnetic resonance. The beneficial effects of the invention are that themethod can achieve the high-precision measurement of the size and direction of a geomagnetic field, can achieve the magnetic field measurement precision of nT magnitude, can achieve the measurement sensitivity of pTmagnitude, and is free of a working blind area.

Description

technical field [0001] The invention belongs to the technical fields of quantum precision measurement and space magnetic field detection, and in particular relates to a weak magnetic field vector measurement method based on an atomic magnetometer. Background technique [0002] The magnetic field is an important space physical field, and the high-precision vector measurement of the magnetic field is very important for applications such as space magnetic field measurement, satellite attitude determination, geomagnetic navigation, earthquake monitoring, and magnetic target detection. Usually, the magnetic field vector measurement is mainly based on the fluxgate magnetometer. Due to the limitation of the working principle, the fluxgate magnetometer has an orthogonality error; the fluxgate magnetometer has zero drift problems accumulated over time and during temperature changes. , will affect the accuracy of magnetic measurement data; the sensitivity required for magnetic field m...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/032
CPCG01R33/032
Inventor 史钰峰刘金胜王文丛时洪宇赵小利邵思霈
Owner SHANDONG INST OF AEROSPACE ELECTRONICS TECH
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