Biaxial atomic spinning magnetometer

Abstract

The invention discloses a biaxial atomic spinning magnetometer. The biaxial atomic spinning magnetometer comprises an alkali metal gas chamber, non-magnetic electric heating equipment, a three-dimensional magnetic coil, a magnetic shielding layer, a pumping laser module and a detecting laser module. The alkali metal gas chamber is filled with alkali metal atoms, a quenching gas and a buffering gas; the non-magnetic electric heating equipment and the magnetic shielding layer enable the alkali metal atoms to work in a high-temperature and low-magnetic field environment, and ensure the alkali metal atoms in a non-spinning exchange relaxation state; the pumping laser module is used for polarizing the alkali metal atoms; the detecting laser module comprises two beams of independent detecting laser which are perpendicular to each other, and are used for sensing the magnetic field intensity in two directions which are perpendicular to each other simultaneously; measurement results are demodulated through a phase-locked amplifier. The biaxial atomic spinning magnetometer can acquire biaxial magnetic field information simultaneously through one alkali metal gas chamber, has the characteristics of high sensitivity, high integration degree and low cost, and has a wide application prospect in the fields of brain magnetic measurement, magnetocardiographic measurement and the like.

Description

technical field [0001] The invention relates to the technical field of magnetometers, in particular to a biaxial atomic spin magnetometer, which can obtain biaxial vector magnetic field information at the same time, has the advantages of high sensitivity, high integration and low cost, and is conducive to the formation of a magnetometer The array can be applied to magnetocardiography, magnetoencephalography and other fields. Background technique [0002] With the rapid development of social economy, the demand for extremely weak magnetic field measurement is increasingly urgent, especially in the fields of medical equipment and underwater anti-submarine. Therefore, the development of ultra-high-sensitivity magnetometers directly affects the improvement of the country's comprehensive strength and people's lives. level of improvement. Superconducting quantum magnetometer (SQUID) is currently the most widely used magnetometer with high sensitivity, but it needs to work under u...

AI Technical Summary

Problems solved by technology

Superconducting quantum magnetometer (SQUID) is currently the most widely used magnetometer with high sensitivity, but it needs to work under ultra-low temperature conditions, so a stable cooling system is required, resulting in large equipment and high cost

In recent years, with the continuous deepening of people's exploration of quantum physics, the spin-free exchange relaxation (Spin Exchange Relaxation Free Regime, SERF) atomic magnetometer (SERF magnetometer for short) proposed by the Romalis group of Princeton University has a pole High theoretical sensitivity, and so far has achieved low-frequency magnetic field measurement sensitivity of sub-feeter level, which far exceeds the performance of SQUID. However, only the low-frequency magnetic field measurement sensitivity of single-axis SERF atomic magnetometer can reach feta-level, and the measurement efficiency is low , which is not conducive to the formation of a highly integrated magnetometer array

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