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Longitudinal magnetic field modulation based three-axis vector atom magnetometer and use method thereof

An atomic magnetometer and longitudinal magnetic field technology, applied in the field of weak magnetic field detection, can solve the problems of inconvenient use and limited application range

Active Publication Date: 2017-06-13
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

However, superconducting quantum interference devices are inconvenient to use due to the need for huge refrigeration equipment, which limits their application range

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  • Longitudinal magnetic field modulation based three-axis vector atom magnetometer and use method thereof
  • Longitudinal magnetic field modulation based three-axis vector atom magnetometer and use method thereof
  • Longitudinal magnetic field modulation based three-axis vector atom magnetometer and use method thereof

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Embodiment Construction

[0030] Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0031] see figure 1 , the three-axis vector atomic magnetometer based on longitudinal magnetic field modulation according to the present invention comprises a No. 1 895nm DFB semiconductor laser 101, a No. 1 convex lens 102, a No. 2 convex lens 103, a No. 1 linear polarizer 104 and a λ / 4 glass plate The pumping optical path composed of 105 consists of No. 2 895nm DFB semiconductor laser 201, No. 3 convex lens 202, No. 4 convex lens 203, No. 2 linear polarizer 204, λ / 4 glass plate 205, Wollaste prism 206 and balanced detector 207 composed of detection optical path, three-dimensional magnetic field generating device composed of mutually orthogonal No. 1 Helmholtz coil 301, No. 2 Helmholtz coil 302, and No. Chamber 5, lock-in amplifier 6, signal processing system 7.

[0032] The atomic gas chamber 5 is filled with 133 Cs atoms and buffer gas.

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Abstract

The invention relates to a longitudinal magnetic field modulation based three-axis vector atom magnetometer and use method thereof and belongs to the technical field of low-intensity magnetic field detection. The longitudinal magnetic field modulation based three-axis vector atom magnetometer comprises a pumping optical path composed of a No.1 895nm DFB semiconductor laser, a No.1 convex lens, a No.2 convex lens, a No. 1 linear polarizing film and a Gamma / 4 slide; a detection optical path composed of a No.2 895nm DFB semiconductor laser, a No.3 convex lens, a No.4 convex lens, a No. 2 linear polarizing film, a Wollaston prism and a balance detector; a three-dimensional magnetic field generating device composed of a No.1 Helmholtz coils, a No.2 Helmholtz coils and a No.3 Helmholtz coils in mutual orthogonality; a heating device; an atomic gas cell; a locking amplifier; and a signal processing system. According to the invention, since longitudinal magnetic field modulation is adopted, technical noise can be reduced in a comparatively large degree. Therefore, extremely high flexibility is achieved. Besides, by utilizing longitudinal magnetic field modulation, inter-axis crosstalk can be reduced, so that magnetic field direction detection becomes more accurate.

Description

technical field [0001] The invention relates to an atomic magnetometer, in particular to a three-axis vector atomic magnetometer based on longitudinal magnetic field modulation and a method for using it, belonging to the technical field of weak magnetic field detection. Background technique [0002] In many vital fields such as biomedicine, geological exploration, nuclear magnetic resonance signal detection and basic physics research, there is an urgent need for effective detection of weak magnetic fields. At present, common magnetometers mainly include fluxgates, inductive pickup coils, proton magnetometers, superconducting quantum interference devices, and atomic magnetometers. These magnetometers have their own characteristics and have been widely used in different fields for different needs. Compared with other magnetometers, superconducting quantum interference devices and atomic magnetometers can achieve extremely high sensitivity. For superconducting quantum interfe...

Claims

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Application Information

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IPC IPC(8): G01R33/02
CPCG01R33/0206
Inventor 丁志超袁杰龙兴武
Owner NAT UNIV OF DEFENSE TECH
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