A method and device for bell-bloom self-modulating three-axis magnetic field measurement

Abstract

The invention relates to a measurement method and device of a Bell-Bloom self-modulation three-axis magnetic field. A conventional Bell-Bloom magnetometer utilizes a single beam to measure a scalar magnetic field, is simple in structure, is high in measurement accuracy and is widely applied to measurement of various scalar magnetic fields. The single-beam Bell-Bloom magnetometer can only measure the scalar magnetic fields, but three-axis magnetic field information is needed in many places in scientific researches and production life, and then a vector magnetometer is needed. Based on the single-beam Bell-Bloom magnetometer, the measurement method and device of the Bell-Bloom self-modulation three-axis magnetic field realize measurement of the three-axis magnetic field by utilizing the self-modulating action on detection light of atomic procession. Compared with the common vector magnetometer, the measurement device of the Bell-Bloom self-modulation three-axis magnetic field is not provided with a radio frequency coil or a magnetic shielding barrel, thereby having a simple light path, being compact in structure and achieving miniaturization and integration easily; the measurement device is low in heating temperature and needs fewer electric elements, so that systematic power consumption is lowered and operation conditions are met more easily; the measurement device utilizes the self-modulating action on detection light of the atomic procession, is lower in noise and is high in detection accuracy.

Description

technical field [0001] The invention relates to a method and device for Bell-Bloom self-modulation three-axis magnetic field measurement, belonging to the technical field of atomic magnetometers. Background technique [0002] Bell-Bloom is a method of measuring scalar magnetic fields based on optical pumping technology, which uses the precession of atoms to achieve magnetic field measurement. Its general idea is to use circularly polarized light with the same frequency as the D1 line transition frequency of alkali metal atoms to pump the atoms. When the modulation frequency of the circularly polarized light is equal to the precession frequency of the atoms, optical magnetic resonance occurs. By extracting the resonance The frequency can be used to calculate the magnitude of the magnetic field. A Bell-Bloom magnetometer is a type of atomic magnetometer. [0003] The atomic magnetometer relies on the measurement of transmitted light. After the light passes through the atomic...

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Problems solved by technology

[0004] The conventional Bell-Bloom magnetometer uses a single beam as the pumping light and the detection light at the same time, and can only measure the scalar magnetic field. However, in many places in scientific research and production and life, more magnetic field information is needed, that is, a vector magnetometer is required.

How to use the Bell-Bloom principle to achieve high-precision three-axis magnetic field measurement is a crucial research content of the atomic magnetometer, and there is no relevant report yet

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