Single-beam unshielded atom magnetometer and detection method thereof

An atomic magnetic, non-shielded technology, applied in the field of deep space detection and magnetic detection, can solve the problems of installation error, instrument complexity, magnetometer integration and even chipization difficulties, to simplify the structure, improve sensitivity, and improve integration. degree of effect

Inactive Publication Date: 2013-11-27
BEIHANG UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Installation errors and instrument complexity have caused great difficulties for the integration and even chipping of magnetometers

Method used

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  • Single-beam unshielded atom magnetometer and detection method thereof
  • Single-beam unshielded atom magnetometer and detection method thereof
  • Single-beam unshielded atom magnetometer and detection method thereof

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Embodiment Construction

[0018] Such as figure 1 As shown, the single-beam unshielded atomic magnetometer of the present invention includes: a single-beam laser 10 and a frequency division modulation closed-loop algorithm module 2, and the frequency division modulation closed-loop algorithm module 2 includes three groups of independent units 1, the geomagnetic field in the MCU Coarse compensation algorithm module (5), coarse geomagnetic field compensation coil 8, frequency division modulation closed-loop coil 9, three sets of current sources 7, photodetectors 4 and band-pass filters 3; the three sets of independent units 1 include function generation amplifiers, lock-in amplifiers, and controllers.

[0019] The principle of the present invention: a single laser beam pumps the atoms in the heated alkali metal gas chamber and then is received by the photodetector. The movement of the alkali metal atoms in the magnetic field can be described by the Block equation, and the Z-direction polarizability P z Th...

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Abstract

The invention discloses a single-beam unshielded atom magnetometer and a detection method of the single-beam unshielded atom magnetometer. The single-beam unshielded atom magnetometer comprises two sets of triaxial orthogonal coils, wherein one set of triaxial orthogonal coils are used for geomagnetic field coarse compensation and the other set of triaxial orthogonal coils are used for closed loop frequency-division modulation. A single beam of pumped laser passes through a heated alkali metal gas chamber and then is received by a photoelectric detector. The detection method of the single-beam unshielded atom magnetometer comprises the following steps that firstly, a geomagnetic field is counteracted by the triaxial orthogonal coils which are controlled in a feedback mode according to a geomagnetic field coarse compensation algorithm of a micro control unit (MCU), and a weak magnetic field environment is created in the gas chamber; secondly, fine compensation for a residual field is completed according to a closed loop frequency-division modulation algorithm; finally, the feedback amount of geomagnetic field coarse compensation and the feedback amount of closed loop frequency-division modulation are added together, so that the size of an external magnetic field is obtained. The single-beam unshielded atom magnetometer and the detection method of the single-beam unshielded atom magnetometer are high in integration level and sensitivity, and capable of obtaining triaxial magnetic field vector information simultaneously, and having wide application prospects in the fields such as deep space exploration and mineral resource exploration.

Description

technical field [0001] The invention belongs to the field of magnetic detection, in particular to a single-beam unshielded atomic magnetometer and its detection method, which can complete the vector measurement of the three-dimensional magnetic field, has the advantages of integration and high sensitivity, and can be applied to deep space detection, mineral production resource exploration and other fields. Background technique [0002] With the development of science and technology, the demand for the measurement of extremely weak magnetic fields makes people put forward higher and higher requirements for the size, sensitivity, thermal stability and power consumption of the magnetometer. A representative of these is the superconducting quantum magnetometer (SQUID). It is the most sensitive magnetometer in widespread use, but it is expensive and requires ultra-low cooling, limiting the kinds of substances it can measure. In recent years, the research on modern physics repre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/032
Inventor 董海峰卓超宣立峰
Owner BEIHANG UNIV
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