SERF-based single-beam reflection-type three-axis magnetic field measuring device

A magnetic field measurement and reflective technology, which is applied in the field of single-beam reflective three-axis magnetic field measurement devices, can solve the problems of inability to measure the magnetic field in the direction of the pumping light, and achieve the effects of low hardware cost, high sensitivity, and simple optical path structure

Active Publication Date: 2021-06-11
BEIHANG UNIV
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Problems solved by technology

[0004] The present invention provides a SERF-based single-beam reflective three-axis magnetic field measurement device. By changing the propagation direction of the pumping light inside the gas chamber, a beam of pumping light and an alkali metal gas chamber can simultaneously perform a three-axis magnetic field. Continuous measurement, simple structure, and overcome the problem that the single-beam SERF magnetometer cannot measure the magnetic field in the direction of the pumping light

Method used

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  • SERF-based single-beam reflection-type three-axis magnetic field measuring device
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  • SERF-based single-beam reflection-type three-axis magnetic field measuring device

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Embodiment 1

[0030] A single-beam reflective three-axis magnetic field measurement device based on SERF, comprising a VCSEL laser 1, a collimator lens 2, a polarizer 4, a 1 / 4 wave plate 5, a first reflector 6, an alkali metal gas chamber 8, and a reflector 9, photodetector 11, lock-in amplifier 12, signal generator 13, triaxial magnetic coil group 14, magnetic shield bucket 15 and oven 16, described VCSEL laser device 1, collimator lens 2, polarizer 4, 1 / 4 The wave plate 5, the first reflector 6, the alkali metal gas chamber 8, the reflector 9, the photodetector 11, the three-axis magnetic coil group 14, the magnetic shield bucket 15 and the oven 16 are all placed in the magnetic shield bucket 15 The interior of the oven 16 is a high thermal conductivity boron nitride material, and a heating film is pasted on its outer surface to heat the alkali metal gas chamber 8 . The signal generator 13 is arranged outside the magnetic shield barrel 15 and inputs a high-frequency modulated magnetic fi...

Embodiment 2

[0054] The difference between this embodiment and the above-mentioned embodiment is that, if figure 2 As shown, the SERF-based single-beam reflective three-axis magnetic field measurement device can directly convert the laser light emitted by the laser into collimated linearly polarized light through the collimator lens, pass through the polarizer and 1 / 4. The direction of the collimated incident pumping light converted by the wave plate is directly incident on the alkali metal gas cell at a direction with an included angle of 45° with the reflector, without being reflected by the first reflector.

Embodiment 3

[0056] An alkali metal gas chamber 8 for single-beam three-axis magnetic field measurement, comprising a gas chamber body 81 and a gas handle, the shape of the gas chamber body 81 is a straight pentagonal prism, and the straight pentagonal prism includes an oblique side 811 and four Adjacent and mutually perpendicular right-angled sides, the included angle between the inclined side 811 and the adjacent right-angled side is 135°, the inclined side of the air chamber main body 81 is provided with a reflector 9, and the reflector 9 makes the The incident pumping light 7 emitted by the laser 1 and the reflected pumping light 10 received by the photodetector 11 are perpendicular to each other.

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Abstract

According to the SERF-based single-beam reflection-type three-axis magnetic field measurement device, the reflector is arranged on the gas chamber main body of the alkali metal gas chamber, so that the incident pumping light emitted by the laser is perpendicular to the reflected pumping light received by the photoelectric detector, and when alkali metal atoms in the gas chamber are in a zero-magnetic environment, the spin vector direction is along the propagation direction of the incident pumping light and the reflection pumping light, no precession occurs, and the light intensity of the laser does not change; when a to-be-measured magnetic field exists in the direction perpendicular to the incident pumping light or the reflected pumping light, the alkali metal atom spin vector in the gas chamber will precession around the to-be-measured magnetic field, the laser intensity will change regularly accordingly, the photoelectric detector converts a light intensity change signal into an electric signal, the lock-in amplifier demodulates the electric signals in the photoelectric detector to obtain voltage signals corresponding to the magnetic fields in the X-axis direction, the Y-axis direction and the Z-axis direction respectively, and then measurement of the three-axis magnetic field is completed through a single light beam.

Description

technical field [0001] The invention belongs to the technical field of SERF (Spin-Exchange Relaxation-Free) atomic magnetometer, in particular to a SERF-based single-beam reflective three-axis magnetic field measuring device. Background technique [0002] In recent years, with the continuous development of quantum theory and laser technology, the performance of atomic magnetometer has been greatly improved, constantly breaking through the limit of measurement accuracy, and becoming the most precise magnetic field instrument. At present, there are many subdivisions of atomic magnetometers, among which the SERF atomic magnetometer is currently the magnetometer with the highest low-frequency sensitivity. Classical single-beam and double-beam SERF atomic magnetometers can at best measure the biaxial magnetic field, but cannot measure the magnetic field in the direction of the pump light. [0003] At present, the implementation schemes of three-axis vector magnetic field measure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/02G01R33/032
CPCG01R33/0206G01R33/032Y02A90/30
Inventor 周斌权闫业广刘刚陆吉玺尹凯峰王婧梁子华
Owner BEIHANG UNIV
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