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Device and method for measuring weak high-frequency alternating magnetic field based on calcium-40 ions

A high-frequency alternating and ionic technology, applied in the direction of the size/direction of the magnetic field, can solve problems such as difficult precision measurement, and achieve the effect of mature technology, high-frequency high-sensitivity magnetic field measurement, and simple structure

Pending Publication Date: 2022-02-08
广州工业技术研究院
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  • Application Information

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Problems solved by technology

However, the frequency measurement range of these magnetometers is focused on static or low frequency magnetic fields
Compared with the precise measurement of low-frequency magnetic fields, the precise measurement of weak high-frequency magnetic fields is quite difficult
[0003] Patent document CN109814049A discloses based on 43 Ca + A device and method for measuring weak high-frequency alternating magnetic fields by ions. This solution is based on calcium-43 ions and is not suitable for calcium-40 ions

Method used

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  • Device and method for measuring weak high-frequency alternating magnetic field based on calcium-40 ions
  • Device and method for measuring weak high-frequency alternating magnetic field based on calcium-40 ions
  • Device and method for measuring weak high-frequency alternating magnetic field based on calcium-40 ions

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Embodiment 1

[0046] refer to figure 1 , 2 As shown, the device for measuring a weak high-frequency alternating magnetic field based on calcium-40 ions provided in this embodiment includes a vacuum chamber, a magnetic field coil and a vacuum maintaining device arranged around the vacuum chamber.

[0047]The vacuum chamber is evenly distributed with the first CF63 window 1, the second CF35 window 2, the third CF63 window 3, the fourth CF35 window 4, the fifth CF63 window 5, the sixth CF35 window 6, the seventh CF63 window 7 and the Eight CF35 windows 8, the top surface of the vacuum chamber is provided with an upper CF150 flange 10, and the bottom surface of the vacuum chamber is provided with a lower CF150 flange 17. Among them, the size of the CF35 window is smaller than that of the CF63 window, that is to say, compared with the solution of the patent document CN109814049A, the volume of the vacuum chamber of the present application becomes smaller, and some CF63 windows become smaller CF...

Embodiment 2

[0052] Calcium-40 ion energy level will show Zeeman splitting under static magnetic field, see Figure 5 (Compared to the patent document CN109814049A, this application uses a calcium-40 ion-based magnetic field measurement scheme, utilizes the simple and easy-to-manipulate energy level structure of calcium-40 ions to construct a protected quantum state subspace, and simplifies the magnetic field measurement method). Suppose the alternating magnetic field to be measured has the following form: B g (t)=B g cos(2πv g t), where the alternating magnetic field frequency v g Equal to the static magnetic field at D 3 / 2 The frequency difference of the splitting frequency of adjacent Zeeman sub-levels of the energy level, namely: 2πυ g = g D mu B B, t is the time variable, the amplitude B of the alternating magnetic field to be measured g is to be measured.

[0053] Specifically, the method for measuring a weak high-frequency alternating magnetic field based on calcium-40 ions ...

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Abstract

The invention discloses a device and method for measuring a weak high-frequency alternating magnetic field based on calcium-40 ions. The device comprises a vacuum chamber and a magnetic field coil and a vacuum maintaining device which are arranged on the periphery of the vacuum chamber, the magnetic field coil is used for generating a magnetic field in the vacuum chamber, and the vacuum maintaining device is used for maintaining vacuum in the vacuum chamber. Eight windows are distributed in the vacuum chamber, the eight windows comprise five CF63 windows and three CF35 windows, and the size of the CF35 windows is smaller than that of the CF63 windows. High-frequency and high-sensitivity magnetic field measurement can be achieved, the calcium-40 ion energy level structure is simple, and laser wavelength control is friendly. And the cooling effect can be achieved only by using laser to carry out energy dissipation on ions. As the whole system is in an ultrahigh vacuum state, ions can be stably located in an electromagnetic potential well for a long time and can be controlled by laser at high precision.

Description

technical field [0001] The invention relates to the field of ion trap magnetometer experiments, in particular to a device and method for measuring weak high-frequency alternating magnetic fields based on calcium-40 ions. Background technique [0002] The high-precision measurement technology of weak magnetic fields is widely used in geophysical exploration, earthquake monitoring and prediction, aeromagnetic mapping, geomagnetic matching navigation, archaeology, maritime salvage, etc., and is also widely used in military applications such as anti-submarine, magnetic fuze, and magnetic navigation. At present, the magnetometers used for weak magnetic field measurement mainly include mechanical magnetometers, fluxgate magnetometers, optical pump magnetometers, superconducting quantum magnetometers, etc. However, the frequency measurement range of these magnetometers is focused on static or low frequency magnetic fields. Compared with the precise measurement of low-frequency mag...

Claims

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Application Information

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IPC IPC(8): G01R33/02
CPCG01R33/02
Inventor 卜锦涛周飞章嘉伟李加冲王彬袁文飞冯芒
Owner 广州工业技术研究院
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