Total field measuring method and device based on superconducting quantum interferometer

A technology of superconducting quantum interference and measurement method, which is applied in the field of total field measurement method and device based on superconducting quantum interferometer, and can solve the problem of low detection accuracy

Active Publication Date: 2019-08-13
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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Problems solved by technology

[0004] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a method and device for measuring the total field based on a supe...

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  • Total field measuring method and device based on superconducting quantum interferometer
  • Total field measuring method and device based on superconducting quantum interferometer
  • Total field measuring method and device based on superconducting quantum interferometer

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Embodiment 1

[0112] Such as figure 1 As shown, the present embodiment provides a total field measurement method based on a superconducting quantum interferometer, and the total field measurement method includes:

[0113] Step 1) Calibrate the degree of non-orthogonality, sensitivity and zero offset of the high-sensitivity three-axis SQUID magnetometer.

[0114] As an example, methods for non-orthogonality, sensitivity, and zero offset calibration of a high-sensitivity three-axis SQUID magnetometer include:

[0115] Step 1.1a) measure the earth's magnetic field based on a reference three-axis magnetometer to obtain a reference value of the earth's magnetic field, and then adjust the driving signal of the three-dimensional Helmertz coil based on the earth's magnetic field reference value, so that the three-dimensional Helmertz coil generates A canceling magnetic field that is equal in magnitude and opposite in direction to the earth's magnetic field. It should be noted that when measuring ...

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Abstract

The invention provides a total field measuring method and device based on a superconducting quantum interferometer.Thetotal field measuring method comprises the steps that non-orthogonality, sensitivity and zero offset calibrations are carried out on a high-sensitivity triaxial SQUID magnetometer; the three-axis SQUID magnetometer measures the magnetic field component in a to-be-measured environment, and the corresponding high-sensitivity SQUID is reset after the magnetic field component value is greater than a preset threshold value, and then an operating point is re-locked;the flux change ofthe high-sensitivity SQUID during dead time is collected by using corresponding low-sensitivity SQUID to obtain the magnetic flux quantum jump number, thus the magnetic field component value measuredby the high sensitivity SQUID during the dead time is compensated to obtain an accurate magnetic field component value; and thetotal field is synthesizedbased on the accurate magnetic field componentvalue to obtain the total field in the to-be-measured environment. According to the total field measuring method and device based on the superconducting quantum interferometer, the problem of low detection accuracy in the total field measurement by using the three-axis vector fluxgate in the prior art is solved.

Description

technical field [0001] The invention belongs to the field of superconducting applications, in particular to a total field measurement method and device based on a superconducting quantum interferometer. Background technique [0002] The vector, gradient and tensor systems composed of three-axis magnetic sensor devices are widely used in geomagnetic navigation, archaeology, unexploded ordnance detection and other fields. The three-axis vector magnetic sensor can not only obtain the orthogonal three-component information of the magnetic field, but also use the three-component The information obtains the total field information, which has more measurement information than the traditional magnetic field scalar detector. [0003] At present, a three-axis vector fluxgate is usually used as a three-axis magnetic sensor for total field synthesis, and its total field accuracy is about 1nT; however, with the development of related fields, the demand for obtaining high-precision total ...

Claims

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Application Information

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IPC IPC(8): G01R33/035
CPCG01R33/0354
Inventor 伍俊荣亮亮邱隆清张国锋张树林代海宾裴易峰李宝清谢晓明
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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