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Method for selecting alkali metal atom source of MEMS air chamber of atom magnetometer

An atomic magnetism, alkali metal technology, applied in the size/direction of the magnetic field, complex mathematical operations, etc., can solve problems such as no public reports, and achieve the effect of improving sensitivity

Active Publication Date: 2020-08-14
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, there is no public report on the selection method and theoretical calculation of the alkali metal atom source in the MEMS gas cell

Method used

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  • Method for selecting alkali metal atom source of MEMS air chamber of atom magnetometer
  • Method for selecting alkali metal atom source of MEMS air chamber of atom magnetometer
  • Method for selecting alkali metal atom source of MEMS air chamber of atom magnetometer

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Embodiment Construction

[0032] The present invention will be described in detail below in combination with specific embodiments.

[0033] In the spin-exchange relaxation (SERF) atomic magnetometer with the MEMS gas cell as the core sensitive head, assuming that the cylindrical MEMS gas cell size is Φ2mm×2mm, the density of alkali metal atoms required to realize the SERF state is 5 ×10 13 piece / cm -3 , the atomic polarizability is 0.5, for the convenience of calculation, it is assumed that the inside of the gas chamber is filled with 1 atm of nitrogen, and the method for selecting the source of alkali metal atoms in the MEMS gas chamber is specifically illustrated by using the present invention. Specific steps are as follows:

[0034] Step 1. First confirm the various mechanisms that lead to atomic spin relaxation in the MEMS gas chamber, including calculating the spin-breaking collision rate R of potassium atoms, rubidium atoms, and cesium atoms SD , the cell wall collision relaxation rate R wall...

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Abstract

The invention discloses a method for selecting an alkali metal atom source of an MEMS air chamber of an atom magnetometer, and belongs to the field of quantum precision measurement. The method specifically comprises the following steps: firstly, confirming various mechanisms causing atomic spin relaxation in the MEMS air chamber; calculating the total relaxation rate according to specific experiment parameters in the air chamber; and finally, comprehensively comparing the advantages and disadvantages of various alkali metal atoms in the MEMS air chamber according to the transverse relaxation time and the implementation difficulty degree, and determining the type of the alkali metal atom source filled in the air chamber. A theoretical basis is provided for selection of the MEMS air chamberatom source in the atom magnetometer, and a theoretical reference is provided for realization and sensitivity improvement of the atom magnetometer.

Description

technical field [0001] The invention belongs to the technical field of quantum precision measurement, and in particular relates to a method for selecting an alkali metal atom source in a MEMS gas chamber of an atomic magnetometer. Background technique [0002] As the most sensitive magnetic field detector at present, the atomic magnetometer can realize ultra-high sensitivity and extremely weak magnetic field measurement. It is the development direction of a new generation of ultra-high sensitivity magnetic field measurement technology. It will serve the inertial navigation and Guidance has great research significance. At the same time, the atomic magnetometer also has great application value in frontier exploration research, geological resource exploration, paleomagnetism analysis, and biomedicine. The alkali metal gas chamber is the core sensitive meter of the entire atomic magnetometer system. Carrying out research on the alkali metal gas chamber based on MEMS (Micro Elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/02G06F17/10
CPCG01R33/02G06F17/10
Inventor 赵立波马银涛罗国希于明智陈瑶韩枫李磊杨萍林启敬卢德江蒋庄德
Owner XI AN JIAOTONG UNIV