Total field measuring method and device based on superconducting quantum interferometer

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 ...

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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 superconducting quantum interferometer, which is used to solve the problem of using a three-axis vector fluxgate for total field measurement in the prior art. problems with low detection accuracy

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