Atom magnetometer without response blind area and method for measuring external magnetic field by employing same

An atomic magnetometer, non-responsive technology, applied in the direction of the size/direction of the magnetic field, using magneto-optical equipment for magnetic field measurement, etc., can solve the problems of inability to achieve effective detection of the external magnetic field, and the existence of response blind areas, to achieve effective detection and steps streamlined effect

Active Publication Date: 2018-07-17
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

When the external magnetic field is parallel to the probe light, since the component of the total spin angular momentum of the sensing atoms along the direction of light propagation will not precess around the external magnetic field, the effective detection of the external m

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  • Atom magnetometer without response blind area and method for measuring external magnetic field by employing same

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Embodiment 1

[0039] An atomic magnetometer with no response dead zone, see figure 1 , including laser 1, beam expander collimator 2, circularly polarized light conversion device 3, acousto-optic modulator 4, Helmholtz coil 5, atomic gas chamber 6, mirror group 7, photodetector 8, lock-in amplifier 9 , signal processing system 10 and heating device 11, wherein:

[0040] The laser 1 , the beam expander collimator 2 , the circularly polarized light conversion device 3 and the acousto-optic modulator 4 are sequentially arranged in series along the propagation direction of the optical path.

[0041] The preferred 895nm DFB semiconductor laser for the laser 1 is used to output the laser beam along the x-axis direction, specifically: the 895nm DFB semiconductor laser is adjusted to 133 Cs atom D1 line jumps the resonant frequency, output laser beam).

[0042] The beam expansion and collimation device 2 performs beam expansion and collimation processing on the laser beam output by the laser 1 , ...

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Abstract

The present invention provides an atom magnetometer without a response blind area. The atom magnetometer comprises a laser, an expanded beam collimation device, a circularly polarized light conversiondevice, an acoustic optical modulator, an Helmholtz coil, an atom air chamber, a reflector set, a photoelectric detector, a lock-in amplifier, a signal processing system and a heating device. The atom magnetometer is simple in structure; and two exciting methods which apply an excitation magnetic field and perform light modulation are combined, and components of the total spin angular momentum ofa sensing atom in two directions are detected to achieve measurement of a blind area without response. The present invention further discloses a method for measuring an external magnetic field by employing an atom magnetometer without response blind area and method. The measurement method is simple, has no response blind area, can rapidly and accurately obtain related data of an external magneticfield, and is high in practicability.

Description

technical field [0001] The invention relates to the technical field of weak magnetic field detection, in particular to an atomic magnetometer with no response blind zone and a method for measuring an external magnetic field. Background technique [0002] In many vital fields, such as basic physics research, biomedicine, deep space exploration, geological exploration, earthquake prediction, and nuclear magnetic resonance signal detection, there is an urgent need for effective detection of weak magnetic fields. At present, the common magnetometers mainly include fluxgates, Hall devices, proton magnetometers, superconducting quantum interference devices and atomic magnetometers. Among them, the superconducting quantum interference device is the most sensitive magnetometer put into application at present, and it has realized magnitude of sensitivity. However, superconducting quantum interference devices are inconvenient to use due to the need for huge refrigeration equipment,...

Claims

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Application Information

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IPC IPC(8): G01R33/032
CPCG01R33/032
Inventor 丁志超袁杰龙兴武李佳佳罗晖
Owner NAT UNIV OF DEFENSE TECH
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