Gradient tolerance calibration device for atomic magnetometer

Abstract

The invention discloses a gradient tolerance calibration device for an atomic magnetometer. The gradient tolerance calibration device comprises a gradient magnetic field reproduction system, a uniformmagnetic field reproduction system and a measurement and control system. The measurement and control system is electrically connected with the gradient magnetic field reproduction system and the uniform magnetic field reproduction system, and is more than 5m away from the gradient magnetic field reproduction system and the uniform magnetic field reproduction system. The gradient magnetic field reproduction system generates a linear gradient magnetic field, the uniform magnetic field reproduction system generates a uniform magnetic field, and the measurement and control system measures the linear gradient magnetic field and the uniform magnetic field to provide a basis for adjusting the sizes of the magnetic fields. The centers of the working areas of the linear gradient magnetic field andthe uniform magnetic field coincide, the directions of the uniform magnetic field and the linear gradient magnetic field are consistent, and a gradient tolerance calibration environment is provided for the atomic magnetometer. The device can be used for calibrating the gradient tolerance of the atomic magnetometer.

Description

technical field [0001] The invention belongs to the field of electromagnetic fields, and in particular relates to an atomic magnetometer gradient tolerance calibration device. Background technique [0002] Atomic magnetometers mainly include proton magnetometers, optical pump magnetometers, laser optical pump magnetometers, etc., which are characterized by high magnetic field measurement accuracy and low noise, among which proton magnetometers can be used as standard magnetometers Accurate measurement of constant weak magnetic fields. The constant weak magnetic field standard devices preserved by the National Institute of Metrology and the National Defense Science and Technology Industry Weak Magnetic Field Level 1 Metrology Station all use proton magnetometers as the main standard devices. Optically pumped magnetometers and laser optically pumped magnetometers are the key development directions of atomic magnetometers, and have extremely important application values ​​in m...

AI Technical Summary

Problems solved by technology

However, we have found in practical applications that when the magnetometer has a gradient in the magnetic field environment, its measurement accuracy and noise index will become worse, and the greater the gradient of the environmental magnetic field, the worse its measurement accuracy and noise index

At present, there is no way to quantitatively analyze the actual gradient tolerance parameters of the atomic magnetometer, but through qualitative speculation, when the environmental magnetic field gradient reaches 40μT / m, its accuracy and noise indicators should be far from the nominal indicators in the manual

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