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Current compensation device and method for obtaining constant magnetic field

A technology of current compensation and constant magnetic field, applied in the field of electromagnetic measurement, which can solve the problem that current cannot be practical.

Pending Publication Date: 2021-11-23
LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In terms of current metering, due to the current based on single-electron tunneling (10 -12 A level) cannot be put into practical use. There is currently no dedicated quantum current reference device in China. Quantum current is generally determined by the ratio of quantum voltage to quantum resistance.

Method used

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  • Current compensation device and method for obtaining constant magnetic field
  • Current compensation device and method for obtaining constant magnetic field
  • Current compensation device and method for obtaining constant magnetic field

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Embodiment 1

[0047] Step 1: Strictly control the experimental environment, keep the magnetic shielding tube 1 (or magnetic shielding room) at a constant temperature, and there are no obvious magnetic field fluctuations and sources of magnetic noise around, so as to reduce the change of the magnetization state of the magnetic shielding material and the influence of environmental magnetic noise on the magnetic field measurement. After strict degaussing, the residual magnetism in the magnetic shielding tube 1 (or the magnetic shielding room) tends to zero.

[0048] Step 2: Start the current compensation device, and use the computer 7 to set the initial value of the constant magnetic field to B 0 , current source 6 output current value I 6 =B 0 / C 2 , stepping current ΔI=0, current value I output by current source 5 5 = 0, C 2 is the coil coefficient of the standard coil 2. In this embodiment, the current source 6 and the current source 5 are both selected from Keysight Technology (Keysig...

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Abstract

The invention discloses a current compensation device and method for obtaining a constant magnetic field. The current compensation device comprises a reproduction magnetic field generation assembly, a pumping-detection type atom magnetometer 4, a compensation magnetic field generation assembly and a computer 7. The reproduction magnetic field generation assembly comprises a current source 6, a standard coil 2 and a magnetic shielding cylinder 1, wherein the magnetic shielding cylinder 1 is used for shielding a geomagnetic field, the standard coil 2 is arranged in the magnetic shielding cylinder 1 in an axial symmetry mode, and the current source 6 supplies a current to the standard coils 2 to generate a reproduction magnetic field. The compensation magnetic field generation assembly comprises a current source 5 and a standard coil 3, and the current source 5 supplies a current to the standard coil 3 to generate a compensation magnetic field. A probe part of the pumping-detection type atom magnetometer 4 is arranged at the geometric center of the standard coil 2 and is used for measuring a uniform magnetic field on the axis of the standard coil 2. The computer 7 is connected with the current source 5 and is used for controlling the current introduced to the standard coil 3 by the current source 5. According to the invention, a low-drift constant reproduction magnetic field can be obtained, and the drift of the output current of the current source 6 along with time can be monitored by using the high-resolution current source 5.

Description

technical field [0001] The disclosure belongs to the technical field of electromagnetic measurement, and in particular relates to a current compensation device and method for obtaining a constant magnetic field. Background technique [0002] Electromagnetic metrology is one of the foundations of modern metrology. How to obtain a constant magnetic field or constant current, and how to monitor the drift of the output current of a constant current source are problems that need to be solved in electromagnetic metrology. In terms of magnetic induction intensity measurement, the Overhauser proton magnetometer is used as the reference magnetometer in the current domestic magnetic induction intensity quantum reference device, and the Cs-3 type self-excited optical pump magnetometer is introduced as the steady-field magnetometer, which can compensate for tens of nits of daily Varying geomagnetic field fluctuations (reference: Improvement of magnetic induction reference device [J], Zh...

Claims

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Application Information

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IPC IPC(8): G01R33/02
CPCG01R33/02
Inventor 缪培贤张金海廉吉庆刘志栋陈江杨炜冯浩史彦超陈大勇陈斌
Owner LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH
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