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System and method for measuring vector magnetic field through laser frequency modulation nonlinear magneto-optical rotation

A technology of vector magnetic field and rotation measurement, applied in radio wave measurement system, magnetic field measurement using magneto-optical equipment, magnetic field size/direction and other directions, can solve the problem of inability to obtain magnetic field direction, etc., and achieve the effect of eliminating measurement dead zone

Pending Publication Date: 2021-06-25
HARBIN ENG UNIV
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method that overcomes the problem that the traditional atomic scalar magnetometer can only measure the magnetic field size but cannot obtain the magnetic field direction, and provides a method that can realize the complete measurement of the magnetic field vector information and the magnetic field measurement accuracy does not depend on the frequency modulation amplitude and laser intensity. Laser FM Nonlinear Magneto-Optical Rotation System for Measuring Vector Magnetic Field

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  • System and method for measuring vector magnetic field through laser frequency modulation nonlinear magneto-optical rotation

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Embodiment 1

[0046] figure 1 It is a schematic diagram of a system for measuring the vector magnetic field by using laser frequency modulation nonlinear magneto-optic rotation in the present invention. The upper left corner is a schematic diagram of the established Cartesian coordinate system, where the origin of the coordinates is established in the atomic gas chamber, the laser propagates along the positive direction of the X-axis, and is polarized along the Y-axis, B 0 is the magnetic field to be measured, α is the angle between the magnetic field to be measured and the positive direction of the Y-axis of the initial laser polarization, and β is the angle between the magnetic field to be measured and the positive direction of the Z-axis.

[0047] The assembly relationship between the components is as follows: the atomic gas chamber 5 is placed in the magnetic field to be measured, and the frequency-modulated laser 1 emits laser light with a center frequency to excite atomic resonance, w...

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Abstract

The invention belongs to the technical field of atomic magnetometers, and particularly relates to a system and method for measuring a vector magnetic field through laser frequency modulation nonlinear magneto-optical rotation. The problem that a traditional atom scalar magnetometer can only measure the size of a magnetic field and cannot obtain the direction of the magnetic field is solved. The system can measure the size of the magnetic field, can also measure the direction of the magnetic field, and achieves the complete measurement of the vector information of the magnetic field. Extra stable power control is not required to be carried out on the laser power, and within a certain range, the laser frequency modulation amplitude and the laser intensity do not influence the magnetic field measurement precision, so that the problem of a measurement dead zone caused by a magic angle can be eliminated.

Description

technical field [0001] The invention belongs to the technical field of atomic magnetometers, and in particular relates to a system and method for measuring a vector magnetic field by using laser frequency modulation nonlinear magneto-optical rotation. Background technique [0002] The precise measurement of the magnetic field vector has important applications in military reconnaissance, mineral exploration, biological magnetic field detection, magnetic navigation and other fields. Under different application scenarios, there are different requirements for the technical indicators such as the bandwidth, sensitivity, and spatial resolution of the magnetometer. The alkali metal atomic magnetometer uses the interaction between light and atoms to detect the precession of the outermost valence electrons of alkali metal atoms under a magnetic field to achieve precise measurement of the magnetic field. It is a magnetometer that has been widely used and has relatively mature technolo...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/032G01V3/40
CPCG01R33/032G01V3/40
Inventor 张军海陈永健康崇
Owner HARBIN ENG UNIV