Atomic magnetometer device without passive magnetic shielding, and magnetic measuring method thereof

Abstract

The invention discloses an atomic magnetometer device without passive magnetic shielding. The atomic magnetometer device comprises an atomic vapor bubble and further comprises a semiconductor laser, a1 / 2 wave plate, a polarization beam splitter, a laser frequency-stabilization module, a phase-locked amplifier, an acousto-optic modulator, a Wollaston prism, a first photoelectric detector, a secondphotoelectric detector and a differential amplifier; and the atomic vapor bubble is provided with a magnetic measuring sensor and located at the center of a three-dimensional Helmholtz coil unit, a computer is connected with a first data collecting card, the first data collecting card is connected with a voltage-controlled current source module, the voltage-controlled current source module is connected with the three-dimensional Helmholtz coil unit, the computer is connected with a second data collecting card, the second data collecting card is connected with an amplifying circuit module, andthe amplifying circuit module is connected with the magnetic measuring sensor. The invention further discloses a magnetic measuring method of an atomic magnetometer without passive magnetic shielding. The atomic magnetometer device is used for solving the problem of geomagnetic measuring, and meanwhile solves the problems of miniaturization and power consumption of the atomic magnetometer as well.

Description

technical field [0001] The invention belongs to the field of atomic and molecular physics, and specifically relates to an atomic magnetometer device without passive magnetic shielding, and also relates to a magnetic measurement method of an atomic magnetometer without passive magnetic shielding, which is suitable for geomagnetic measurement, deep space magnetic measurement, and magnetic anomaly measurement research in related fields. Background technique [0002] The basic principle of the atomic magnetometer is to obtain the magnitude of the magnetic field by measuring the Larmor precession frequency of the polarization vector of the atom in the external magnetic field. It is a high-sensitivity magnetic measurement tool. measurements with an atomic magnetometer”[Appl.Phys.Lett.97, 151110(2010)] reported that the highest sensitivity achieved in the experimental demonstration was 0.16fT / Hz 1 / 2 , but its atomic vapor bubble needs to work effectively in a high temperature (gre...

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Problems solved by technology

[0005] The purpose of the present invention is to address the problems existing in the prior art, to provide a non-passive magnetic shielding atomic magnetometer device, and to provide a non-passive magnetic shielding atomic magnetometer magnetic measuring method, which solves the problem that the atomic magnetometer is used for geomagnetism. The problem of measurement, but also solve the problem of miniaturization and power consumption of atomic magnetometer

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