Non-blind area magnetic field measuring device and measuring method based on laser polarization modulation

Abstract

The invention provides a non-blind area magnetic field measuring device and method based on laser polarization modulation. The non-blind area magnetic field measuring device comprises a light path module, an atomic gas chamber, a temperature control module, a magnetic field control module and a signal analysis control module. The atom gas chamber is filled with alkali metal atoms as a working substance; the light path module is used for pumping and detecting alkali metal atoms in the atomic gas chamber; the temperature control module is used for stabilizing the temperature of the atomic gas chamber within a preset temperature range of + / -1 DEG C; the magnetic field control module is used for generating an alternating excitation magnetic field required by the atomic gas chamber; and the signal analysis control module is used for resolving to obtain to-be-measured magnetic field intensity and azimuth information. According to the invention, a vector magnetic field measurement blind area corresponding to tensor polarization single distribution is effectively eliminated.

Description

technical field [0001] The invention relates to the technical field of magnetic field measurement, in particular to a non-blind zone magnetic field measurement device and measurement method based on laser polarization modulation. Background technique [0002] There are two main parameters to characterize the magnetic field, namely the magnetic field strength and the magnetic field direction. A magnetometer is a general term for devices that measure magnetic fields. According to the type of measurement data, magnetometers can be divided into scalar magnetometers (or total field magnetometers) and vector magnetometers. The scalar magnetometer can only obtain the strength information of the magnetic field to be measured, and the vector magnetometer can obtain the strength and orientation information of the magnetic field to be measured. Taking the target detection application as an example, the scalar magnetometer can obtain the distance between the target to be measured and ...

AI Technical Summary

Problems solved by technology

The tensor polarization of atoms can be used to directly measure the magnetic field vector information, but when the angle between the magnetic field to be measured and the polarization direction of linearly polarized light is a specific value, there is a measurement blind zone, and the sensitivity to the magnetic field response to different orientations varies greatly

[0005]The existence of the measurement blind zone has become the main obstacle to the further development and application of the vector atom magnetometer

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