Single-beam SERF atom magnetometer and alkali metal atom density measurement method

A technology of atomic magnetism and atomic density, which is applied in the use of magneto-optical equipment for magnetic field measurement, magnetic field size/direction, etc. It can solve problems such as late start and weak foundation, and achieve small constraints, simple structure, and high integration. Effect

Pending Publication Date: 2021-12-03
XI AN JIAOTONG UNIV +1
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Problems solved by technology

In recent years, Beijing University of Aeronautics and Astronautics, Xi'an Jiaotong University and other units have also carried out research on related work, but due to the late start in China and the weak foundation, efforts need to be made to improve the sensitivity of the atomic magnetometer

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  • Single-beam SERF atom magnetometer and alkali metal atom density measurement method
  • Single-beam SERF atom magnetometer and alkali metal atom density measurement method
  • Single-beam SERF atom magnetometer and alkali metal atom density measurement method

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Embodiment Construction

[0032] In order to make the purpose and technical solution of the present invention clearer and easier to understand. The present invention will be further described in detail below in conjunction with the drawings and embodiments. The specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0033] In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner" and "outer" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and Simplified descriptions, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular ori...

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Abstract

The invention discloses a single-beam SERF atom magnetometer and an alkali metal atom density measurement method, and the method comprises the following steps: firstly, compensating the magnetic field intensity of the center position of the single-beam SERF atom magnetometer in three directions to zero, and heating an alkali metal gas chamber to enable alkali metal atoms to reach an SERF state; then applying a constant direct-current magnetic field along the direction of one sensitive axis, applying a bias magnetic field with modulation and a bias magnetic field which continuously changes and crosses a zero point along the direction of the other sensitive axis, and recording an output signal of the magnetometer to obtain a magnetic field resonance curve with a dispersion line type; further obtaining the magnetic field resonance line width under different direct-current magnetic fields along the X-axis direction; obtaining the relation between the magnetic field resonance line width and the direct-current magnetic field size through quadratic function fitting; and finally, calculating the alkali metal atomic density by using the quadratic term coefficient of the quadratic function, so that the in-situ measurement of the alkali metal atomic density is realized.

Description

technical field [0001] The invention belongs to the technical field of quantum precision measurement, and in particular relates to a single-beam SERF atomic magnetometer and a method for measuring alkali metal atomic density. Background technique [0002] Spin exchange relaxation (SERF, spin exchange relaxation free) atomic magnetometer, as the most sensitive magnetic field detector at present, has great potential in the fields of frontier basic scientific research such as dark matter detection, mineral resource exploration, and heart-brain magnetic source imaging biomedicine. great application value. The SERF atomic magnetometer realizes vector magnetic field measurement by measuring the Larmor precession frequency of polarized alkali metal atoms in a magnetic field. The density of alkali metal atoms directly affects the signal-to-noise ratio and sensitivity of an atomic magnetometer. Therefore, it is of great significance to accurately and rapidly measure the density of a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/032
CPCG01R33/032
Inventor 赵立波马银涛陈瑶乔智霞罗国希李伟于明智王延斌林启敬杨萍王久洪蒋庄德
Owner XI AN JIAOTONG UNIV
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