Magnetometer and magnetometer detection method

Abstract

The invention relates to a magnetometer and a magnetometer detection method. A laser module is used for emitting a first laser beam. A beam splitting module is arranged on a light path of the first laser beam. A linear polarization module is arranged on a light path of the second laser beam. An acousto-optic modulation module is arranged on a light path of the linearly polarized light beam with adjustable light intensity. A diffracted light selection module is arranged on a light path of the diffracted light. A circular polarization module is arranged on a light path of the first-stage diffracted light. An atomic gas chamber is arranged on a light path of the circularly polarized light. A photoelectric detection module is arranged on a light path of the detection light. The output end of a signal generation module is connected with the control end of the acousto-optic modulation module. The input end of a lock-in amplification module is connected with the output end of the photoelectric detection module and the output end of the signal generation module. The input end of a control module is connected with the output end of the lock-in amplification module, and the output end of the control module is connected with the control end of the signal generation module.

Description

technical field [0001] The present application relates to the technical field of quantum precision measurement, in particular to a magnetometer and a magnetometer detection method. Background technique [0002] The detection of weak magnetic field signals can be applied in many important fields, such as non-destructive testing, geological exploration, underwater long-wave communication and geomagnetic navigation. The magnetic field measured by a traditional fluxgate is generally on the order of nT, and it is impossible to measure a weaker magnetic field. There are two main types of magnetometers and gradiometers developed based on quantum effects. One is the magnetometer or gradiometer developed based on superconducting quantum interference devices, and the other is the atomic magnetometer or magnetic gradiometer. The atomic magnetometer does not require a huge refrigeration device, and it is easier to realize the miniaturization of the device. At the same time, the sensiti...

AI Technical Summary

Problems solved by technology

There will be crosstalk between the RF coils, which will introduce errors and lead to low sensitivity of the magnetometer

In addition, the angle between the radio frequency coil and the pump light in the traditional magnetometer needs to be precisely maintained at 45°, and the deviation of the angle will also lead to the deviation of the measured magnetic field.

There are two dead zones in the traditional magnetometer, and it is impossible to detect the magnetic field in the polar region parallel to the light path and the equator region perpendicular to the light

Therefore, the traditional magnetometer is inaccurate in measuring the magnetic field, and the measurement accuracy is low

Images