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A Sensitivity Index Calibration Method for High Sensitivity Atomic Magnetometer

A technology of atomic magnetometer and calibration method, which is applied in the direction of instruments, measurement of magnetic variables, magnetic field offset compensation, etc., can solve the problem that high-sensitivity atomic magnetometers cannot be accurately calibrated.

Active Publication Date: 2020-11-13
SHANDONG INST OF AEROSPACE ELECTRONICS TECH
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Problems solved by technology

However, when the sensitivity index of the calibrated atomic magnetometer is at the fT level and placed in the current pT level stable magnetic field, the high-sensitivity atomic magnetometer will not be calibrated accurately

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  • A Sensitivity Index Calibration Method for High Sensitivity Atomic Magnetometer

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Embodiment Construction

[0015] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0016] The invention provides a sensitivity index calibration method of a high-sensitivity atomic magnetometer. A high-sensitivity atomic magnetometer refers to an atomic magnetometer whose noise level is higher than the pT level. The principle of the method is to adopt a two-stage compensation method, namely Inside the first-level compensation system composed of one winding in the original three-axis constant magnetic field coil, a new set of constant magnetic field coil is constructed, and another closed feedback system is formed by using the atomic magnetometer to be calibrated to further offset the disturbing magnetic field, and the environment The magnetic interference is reduced to a level equivalent to the noise of the magnetometer under test itself, that is, a stable magnetic field with ambient magnetic field noise close to or lower than the fT leve...

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Abstract

The invention discloses a sensitivity index calibration method of a high-sensitivity atom magnetometer. In a traditional triaxial constant magnetic field coil, by use of a to-be-tested atom magnetometer, a newly added constant magnetic field coil and a signal processing circuit B, a secondary closed feedback system is formed, so interference magnetic field is further counteracted; the magnetic field noise in the environment is controlled to be in sensitivity level of the to-be-tested atom magnetometer; the to-be-tested atom magnetometer measures fluctuation of the magnetic field in the environment; and processing and analysis are performed on the measurement data, so sensitivity indexes of the atom magnetometer are acquired. According to the invention, the interference magnetic field can be further counteracted; the noise level of the stable constant magnetic field is improved to be sensitivity order of the to-be-tested atom magnetometer; and the sensitivity indexes of the to-be-testedatom magnetometer are measured.

Description

technical field [0001] The invention relates to the technical field of quantum precision measurement, in particular to a sensitivity index calibration method of a high-sensitivity atomic magnetometer. Background technique [0002] The atomic magnetometer uses the spin of the polarized atom to measure the magnetic field, that is, to measure the precession of the atom whose outermost electron spin is polarized in the external magnetic field, which belongs to the electron precession magnetometer. Atomic magnetometers generally use helium ( 4 He), gaseous alkali metal elements ( 85 Rb, 87 Rb, 133 Cs, 39 K) and mercury vapor (Hg) as working substances are new magnetometers for detecting weak magnetic fields with very high sensitivity. After the atomic magnetometer prototype is completed, its technical indicators need to be calibrated, and one of the important indicators is the sensitivity of the magnetometer. The sensitivity of the magnetometer is generally measured by its ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R35/00G01R33/00
CPCG01R33/0017G01R35/00
Inventor 赵小利史钰峰任文冠邵思霈
Owner SHANDONG INST OF AEROSPACE ELECTRONICS TECH
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