Magnetic field measuring device

Abstract

The invention relates to a magnetic field measuring device which comprises a laser detection module comprising a laser, a detector and a control module, and a magnetic induction module comprising an atomic gas chamber and a reflector. The magnetic induction module is arranged in a magnetic field to be measured, and a first optical signal with the frequency consistent with the transition frequency of atoms is input into the atomic gas chamber through the laser to polarize the atoms, so that the atoms in the atom air chamber perform Larmor precession under the action of the magnetic field to be measured; the control module performs amplitude modulation on the first optical signal, so that the modulated first optical signal is input into the atomic gas chamber and then returns to the atomic gas chamber through the reflective mirror to form a second optical signal, and the detector acquires a light intensity signal of the second optical signal and sends the light intensity signal to the control module; the control module determines the magnetic field intensity of the magnetic field to be measured according to the light intensity signal and the gyromagnetic ratio of the atoms. Electrical noise interference of the detector on atoms in the atomic gas chamber can be avoided, the sensitivity of the magnetic induction module is improved, and the temperature of the atomic gas chamber is reduced.

Description

technical field [0001] The present application relates to the technical field of magnetic field strength measurement, in particular to a magnetic field measurement device. Background technique [0002] Magnetic field detection involves many fields. In many fields, it is often necessary to accurately measure the strength of the magnetic field through a precise magnetometer. In recent years, the research on magnetometers has derived various types of magnetometers. As a highly sensitive magnetic field detection device, the meter has broad application prospects. [0003] In the traditional technology, the atomic magnetometer uses a laser to emit a single beam of circularly polarized light to act on the atomic gas chamber in the probe, so that the atoms in the atomic gas chamber undergo Larmor progression under the action of the circularly polarized light and an external magnetic field. Then, the detector in the probe detects the laser light intensity after interacting with the ...

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Problems solved by technology

[0004] However, the probe of the existing magnetometer is not conducive to miniaturization design, and the magnetic field felt by the atoms in the atomic gas chamber in the probe is easily affected by the electrical noise emitted by the active devices in the probe, resulting in the sensitivity of the magnetometer reduce

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