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SERF atom magnetometer device and method based on optical frequency shift modulation

A technology of atomic magnetic strength and optical frequency shift, applied in the direction of the size/direction of the magnetic field, using magneto-optical equipment for magnetic field measurement, etc., to achieve the effect of eliminating noise interference

Active Publication Date: 2018-09-11
BEIHANG UNIV
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Problems solved by technology

[0003] The problem solved by the present invention is: to overcome the interference noise problem introduced by the modulation magnetic field in the existing conventional modulated SERF atomic magnetometer, and to provide a SERF magnetometer device and method based on optical frequency shift modulation, which utilizes an additional optical path Generate an optical frequency shift modulation to replace the magnetic field modulation, thereby eliminating the interference noise problem caused by the modulated magnetic field

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  • SERF atom magnetometer device and method based on optical frequency shift modulation

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Embodiment Construction

[0011] (1) figure 1 It is a structural block diagram of the SERF magnetometer device based on optical frequency shift modulation of the present invention. It can be seen from the figure that the device of the present invention includes a photoelectric control system 1 and a magnetometer probe system 2, wherein the photoelectric control system 1 includes a first laser 11, a Two lasers 12, liquid crystal phase retarder controller 13, lock-in amplifier 14, magnetometer probe system includes fiber optic collimator 201, 1 / 4 wave plate 202, first reflector 203, alkali metal gas chamber 204, nonmagnetic An electric heating oven 205 , a second reflector 206 , a photodetector 207 , a fiber collimator 208 , a 1 / 4 wave plate 209 , and a liquid crystal phase retarder 210 . Among them, the magnetometer probe system 2 needs to be installed in a magnetic shielding environment, and the alkali metal gas chamber 204 needs to be heated by a non-magnetic electric heating device 205, so that the a...

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Abstract

The invention relates to an SERF atom magnetometer device and method based on optical frequency shift modulation. A conventional modulation-type SERF atom magnetometer method employs a coil for generating an AC magnetic field to achieve the modulation of atomic spinning, so the method is liable to cause the magnetic field noise interference. According to the method provided by the invention, a laser beam with the wavelength being nearby a base metal atom D1 ray, and is enabled to act on the base metal atom to generate the optical frequency shift modulation effect through the modulation of a liquid crystal phase retarder. Because the optical frequency shift is equivalent to a virtual magnetic field for the base metal atom, the device and method provided by the invention can be used for replacing a conventional magnetic field modulation device and method, and can eliminate the noise interference caused by the magnetic field modulation.

Description

technical field [0001] The invention relates to a SERF (Spin-Exchange-Relaxation-Free, no spin exchange relaxation) atomic magnetometer device and method based on optical frequency shift modulation, belonging to the field of atomic magnetometers. Background technique [0002] The SERF atomic magnetometer is an ultra-high-sensitivity magnetometer, which is expected to be widely used in the fields of material magnetic testing, human body extremely weak magnetic field measurement, etc. The miniaturized SERF atomic magnetometer usually adopts a single beam + magnetic field modulation scheme. This scheme uses a coil to generate an alternating magnetic field to modulate the atomic spin, and then extracts the magnetic field signal through a lock-in amplifier. Because this method needs to introduce an additional modulation magnetic field, it is easy to cause magnetic field noise. In addition, when multiple SERF atomic magnetometers are close to work together, they are also prone to ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/032
CPCG01R33/032
Inventor 房建成陆吉玺杨可赵俊鹏丁铭全伟刘刚
Owner BEIHANG UNIV
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