Extremely-weak magnetic field standard device

Abstract

The invention discloses an extremely-weak magnetic field standard device which comprises a three-axis magnetic field coil, a magnetic field noise compensation system, a low-temperature cooling system,a superconducting shielding cylinder and an extremely-weak magnetic field coil. The low-temperature cooling system is arranged in a magnetic field environment constructed by the three-axis magnetic field coil and the magnetic field noise compensation system, the three-axis magnetic field coil compensates a geomagnetic field fixed component, and the magnetic field noise compensation system compensates geomagnetic field noise; the superconducting shielding cylinder is located in the low-temperature cooling system, the low-temperature cooling system reproduces the ultralow-temperature environment, the superconducting shielding cylinder reaches the superconducting critical temperature or below, magnetic field shielding is achieved in the cylinder, and the extremely-weak magnetic field coil islocated in the superconducting shielding cylinder and generates an extremely-weak magnetic field. According to the invention, an ultralow-noise 'zero magnetic space' environment can be provided for the extremely weak magnetic field.

Description

technical field [0001] The invention belongs to the field of electromagnetic fields, and in particular relates to an extremely weak magnetic field standard device. Background technique [0002] The superconducting quantum magnetometer is currently the most sensitive magnetometer. It is mainly used for super-level magnetic field measurements such as heart magnetism, brain magnetism, and rock measurements in ancient geomagnetism. The minimum stability can only reach the Pete level, and the minimum magnetic field value and magnetic field stability are 3 orders of magnitude lower than that of the superconducting quantum magnetometer, which is far from meeting the testing requirements of the superconducting quantum magnetometer. Therefore, there is a need for a device capable of establishing a standard extremely weak magnetic field environment with magnetic field noise lower than fT level and magnetic field lower than pt level. Contents of the invention [0003] In view of thi...

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Problems solved by technology

[0002] The superconducting quantum magnetometer is currently the most sensitive magnetometer. It is mainly used for super-level magnetic field measurements such as heart magnetism, brain magnetism, and rock measurements in ancient geomagnetism. The minimum stability can only reach the Pete level, and the minimum magnetic field value and magnetic field stability are 3 orders of magnitude lower than that of the superconducting quantum magnetometer, which is far from meeting the testing requirements of the superconducting quantum magnetometer

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