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Magnetic field measurement method and atomic magnetometer system

A magnetic field measurement and atomic technology, which is applied in the use of magneto-optical equipment for magnetic field measurement, magnetic field size/direction and other directions, which can solve the problem of low sensitivity of atomic magnetometers

Pending Publication Date: 2021-10-01
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a magnetic field measurement method and an atomic magnetometer system, which solves the problem that the sensitivity of the atomic magnetometer in the prior art is not high

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  • Magnetic field measurement method and atomic magnetometer system

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[0057] In order to make the object, technical solution and advantages of the present invention more clear and definite, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0058] The basic working principle of the all-optical atomic magnetometer is as follows: First, a beam of laser light is irradiated on the alkali metal atomic gas, and the atoms are pumped, so that the atoms are redistributed on the magnon energy level, and the macroscopic appearance is atomic With a certain polarization orientation, this process is the preparation process of the polarized state of the atom; then the polarized atoms will undergo Larmor precession around the direction of the external magnetic field, and the precession frequency (that is, the Larmor frequency) is proportion...

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Abstract

The invention provides a magnetic field measurement method and an atomic magnetometer system. The method comprises the steps that: a light intensity modulator is controlled to carry out periodic modulation on laser, so as to obtain pump light and detection light, the light intensity of the pump light is greater than the light intensity of the detection light; the light intensity modulator is controlled to modulate the pump light to obtain modulated pump light with a modulation signal; a signal detector is controlled to receive changed detection light obtained after the detection light passes through Larmor procession of a polarization state atom, and obtains a polarization rotation angle signal of the changed detection light, the polarization state atom is generated by the modulated pump light acting on an atom probe, and Larmor procession of the polarization state atom is generated under a magnetic field to be detected; and the polarization rotation angle signal is demodulated, and the value of the magnetic field to be detected is calculated according to the frequency of the modulation signal. With the magnetic field measurement method and the atomic magnetometer system adopted, the problem of low sensitivity of an atomic magnetometer in the prior art is solved.

Description

technical field [0001] The invention relates to the field of magnetic field measurement, in particular to a magnetic field measurement method and an atomic magnetometer system. Background technique [0002] Magnetic field detection has a wide range of needs in the fields of resource exploration, geophysics, non-destructive testing, biomedicine, and basic science. Compared with traditional magnetometers, atomic magnetometers have the advantages of high sensitivity, small size, and low power consumption. They are suitable for many application scenarios such as geomagnetic exploration, geomagnetic navigation, magnetic anomaly detection, and biomagnetic detection. The all-optical atomic magnetometer adopts all-optical state preparation and optical signal detection, without the need to introduce additional radio frequency magnetic field signals, which is conducive to the non-interference and integration of multiple probes; compared with radio frequency atomic magnetometers, it re...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/032
CPCG01R33/032
Inventor 徐晓天杨胜军陈斌范靖云
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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