Atomic magnetometer under high excitation magnetic field and use method thereof

A technology of atomic magnetometer and excitation magnetic field, applied in the field of weak magnetic field detection, which can solve the problem of low sensitivity and achieve the effect of high sensitivity and improved sensitivity

Active Publication Date: 2017-06-20
NAT UNIV OF DEFENSE TECH
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  • Abstract
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Problems solved by technology

Due to the different characteristics of the detection signal, compared to M z Atomic Magnetometer, M x The detection speed of the atomic magnetometer is relatively fast, but the sensitivity is relatively low

Method used

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  • Atomic magnetometer under high excitation magnetic field and use method thereof
  • Atomic magnetometer under high excitation magnetic field and use method thereof
  • Atomic magnetometer under high excitation magnetic field and use method thereof

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Embodiment Construction

[0025] Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0026] see figure 1 , an atomic magnetometer under a high excitation magnetic field according to the present invention, comprising a 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 105. Pumping optical path, detection optical path composed of 852nm 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 balance detector 207 , Helmholtz coil 3, heating device 4, atomic gas chamber 5, lock-in amplifier 6, signal processing system 7.

[0027] The atomic gas chamber 5 is filled with 133 Cs atoms and buffer gas.

[0028] The pumping optical path propagates along the z-axis direction, and is used to polarize atoms in the gas chamber 5 133 Cs atoms to greatly increase the ...

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Abstract

The invention relates to an atomic magnetometer, particularly relates to an atomic magnetometer under a high excitation magnetic field and a use method thereof, and belongs to the technical field of weak magnetic field detection. The magnetometer comprises a pumping light path which is composed of a 895nm DFB semiconductor laser, a first convex lens, a second convex lens, a first linear polarizer and a lambda/4 wave plate, a detection light path which is composed of a 852nm DFB semiconductor laser, a third convex lens, a fourth convex lens, a second linear polarizer, a Wollaston prism and a balance detector, a Helmholtz coil, a heating device, an atomic air chamber, a lock-in amplifier and a signal processing system. The high-sensitivity atomic magnetometer is realized by using the sag of an MR signal related to excitation magnetic field frequency response under the high excitation magnetic field so as to be applied to the Mx-MR atomic magnetometer for enhancing the sensitivity.

Description

technical field [0001] The invention relates to an atomic magnetometer, in particular to an atomic magnetometer under a high excitation magnetic field and a method for using it, and belongs 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. The superconducting quantum interference device is currently the most sensitive magnetometer put into use, and it has been realized magnitude of sensitivity. However, superconducting quantum interference devices are inconvenient to use due to the need for huge refrigeration equipment, which limits their application range. Atomic magnetometers are magnetometers based on the detection of spin precession. For sensing atoms (alkali metal atoms or 4 He), the total spin angular momentum of the ato...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/02
CPCG01R33/02
Inventor 丁志超袁杰龙兴武
Owner NAT UNIV OF DEFENSE TECH
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