A method for measuring residual magnetism in shielded barrels based on in-situ magnetometer

Abstract

A method for measuring residual magnetism in shielded barrels based on an in-situ magnetometer is suitable for testing the residual magnetism in shielded barrels of atomic sensors. First, apply a static magnetic field, modulate the magnetic field, pump light, and detect light to make the atomic magnetometer work in the magnetic resonance state; demodulate the magnetometer signal, extract its DC component with a low-pass filter, and obtain the horizontal or vertical static For the remanence in the magnetic field direction, apply a DC compensation magnetic field in the transverse direction to compensate the remanence to zero; carry out the remanence measurement and compensation under different detection light intensities, and find that the output value of the compensation magnetic field changes linearly with the detection light intensity, and the straight line is on the vertical axis. The intercept above is the value of the actual lateral remanence after excluding the optical frequency shift; the electronic resonance frequency is measured by the method of magnetic field sweep, and the change of the resonance frequency after the direction of the static magnetic field and the left-right rotation of the pump light are simultaneously reversed, divided by Twice the alkali metal gyromagnetic ratio can get the actual longitudinal remanence. The invention does not need to use an external sensor, which greatly facilitates the design of the atomic sensor.

Description

technical field [0001] The invention relates to the field of atomic sensors, in particular to a method for measuring residual magnetism in a shielded barrel based on an in-situ magnetometer. Background technique [0002] In recent years, with the rapid development of atomic physics, breakthroughs in theories such as quantum optics and cold atoms, and advances in technologies such as lasers and quantum manipulation, atomic sensors have gradually attracted attention and attention. High-precision and high-sensitivity atomic sensors are widely used in time measurement, inertial measurement, magnetic field measurement and other fields, some of which have achieved engineering applications and brought about major technological changes. Since the atomic energy level is very sensitive to the magnetic field, magnetic shielding is generally required in the atomic sensor to reduce the interference of the ambient magnetic field on the atoms. Good shielding effect. [0003] In order to ...

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Problems solved by technology

[0004] The present invention solves the problem that the existing measuring method requires an additional sensor to cause complex operation and because the influence of the optical frequency shift is not considered, the measured magnetic field is the superposition of the actual remanence and the false magnetic field generated by the optical frequency shift, which cannot reflect the environmental remanence of the shielding barrel In order to solve the problems of shielding effect and other problems, a method for measuring the residual magnetism in the shielded bucket based on the in-situ magnetometer is provided, which can measure the residual magnetism inside the shielded bucket of the atomic sensor without using an external magnetic field sensor, and can eliminate the optical frequency shift To obtain accurate remanence, to evaluate the shielding performance of the shielding barrel, and to provide guidance for the design and testing of atomic sensors

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