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Alkali metal atomic magnetometer air chamber electric heating magnetic field measurement method

An atomic magnetic and magnetic field measurement technology, applied in the fields of atomic spin gyroscopes and atomic magnetometers, can solve the problems of low and in-situ measurement of measurement accuracy, and achieve the effect of improving measurement accuracy and eliminating position errors

Active Publication Date: 2016-10-12
BEIHANG UNIV
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Problems solved by technology

[0004] The problem to be solved by the present invention is: to overcome the shortcomings of existing conventional methods that cannot measure in situ and the measurement accuracy is not high, and provide a method for measuring the electric heating magnetic field of the alkali metal atomic magnetometer gas chamber, using the three-dimensional principle of the SERF atomic magnetometer Potential magnetic compensation technology, to obtain the difference between the magnetic field felt by atoms under the condition of DC power drive and high-frequency modulation circuit drive, and realize the accurate measurement of electric heating disturbance magnetic field

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  • Alkali metal atomic magnetometer air chamber electric heating magnetic field measurement method
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  • Alkali metal atomic magnetometer air chamber electric heating magnetic field measurement method

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Embodiment Construction

[0019] Such as figure 1 Shown, the specific implementation steps of the present invention are as follows:

[0020] (1) The alkali metal gas chamber 9 is installed in the magnetic shielding barrel 19, so that the atoms work in a low magnetic field environment to realize the SERF state. Switch the switch 5 to the DC power supply 3 to drive the electric heater 10 to be tested, use the electric heater 10 to heat the alkali metal gas chamber 9, and make the alkali metal atomic number density in the alkali metal gas chamber 9 reach 10 13 ~10 14 piece / cm 3 level and reach a steady state.

[0021] The laser output from the pumping laser 2 passes through the polarizer 7 and the 1 / 4 wave plate 8 successively, and becomes circularly polarized light to irradiate the alkali metal gas chamber 9 to realize the pumping of atoms. The laser output from the detection laser 1 successively passes through the reflector 12 and the polarizer 13 to become linearly polarized light, and then enters ...

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Abstract

The invention relates to an alkali metal atomic magnetometer air chamber electric heating magnetic field measurement method. For a conventional measurement method, a magnetic field produced after an air chamber electric heater is electrified is measured using other kinds of magnetometers. The measurement method is affected by the size and installation position of the magnetometer adopted, and in-situ measurement cannot be realized. Moreover, the measurement accuracy is not high due to the limitation of the sensitivity of the magnetometer. While in the method of the invention, an SERF (Spin-Exchange-Relaxation-Free) atomic magnetometer three-dimensional in-situ magnetic compensation technology is used to measure a magnetic field sensed by atoms when a DC power supply drives an electric heater and a magnetic field sensed by atoms when a high-frequency modulation circuit drives the electric heater, and subtraction is performed on the two magnetic fields to get the size of the electric heating magnetic field. By using the method, in-situ measurement is realized, and the position error of measurement is eliminated. Moreover, because of the use of the measurement information of an atomic magnetometer, the accuracy of measurement is greatly improved.

Description

technical field [0001] The invention relates to a method for measuring the magnetic field of an alkali metal atomic magnetometer gas chamber electric heater, which belongs to the technical field of atomic magnetometers and can also be used in the field of atomic spin tops. Background technique [0002] Many kinds of alkali metal atomic magnetometers, such as SERF (Spin-Exchange-Relaxation-Free, no spin exchange relaxation) atomic magnetometer, potassium optical pump atomic magnetometer, etc., need to heat their gas chambers , to ensure a certain density of alkali metal atoms, thereby improving its signal-to-noise ratio. The most commonly used gas chamber heating method is electric heating, that is, using electric current to drive an electric heater to generate Joule heat to achieve the heating effect. The driving current of the electric heating will inevitably generate a magnetic field, which will be felt by the atoms together with the magnetic field to be measured. Theref...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/032
CPCG01R33/032
Inventor 房建成钱政陆吉玺尹彦胡朝晖刘刚
Owner BEIHANG UNIV
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