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Multifunctional magnetometer with combination of searching coil type and flux-gate type and application thereof

A technology for searching coils and magnetometers, applied in the field of multi-function magnetometers, can solve the problems of poor resolution, low open-loop sensitivity of three-axis magnetometer probes, and mutual interference between measuring DC magnetic fields and AC magnetic fields, and achieve high open-loop sensitivity. Effect

Inactive Publication Date: 2014-01-08
BEIJING NATESILA SCI & TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a multifunctional magnetometer combined with a search coil type and a fluxgate type, to solve the problem of low open-loop sensitivity of the three-axis magnetometer probe, weak resolution, and mutual interference between the measured DC magnetic field and the AC magnetic field

Method used

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  • Multifunctional magnetometer with combination of searching coil type and flux-gate type and application thereof
  • Multifunctional magnetometer with combination of searching coil type and flux-gate type and application thereof
  • Multifunctional magnetometer with combination of searching coil type and flux-gate type and application thereof

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Effect test

Embodiment 1

[0022] A multifunctional magnetometer combining search coil and fluxgate. The feedback winding adopts Helmholtz coil structure, which is used for both the fluxgate and the search coil. The middle coil is used as the fluxgate magnetometer. The measuring coil of the instrument is also used as the search coil of the search coil type magnetometer. The built-in magnetic core is not only used as the fluxgate switch core, but also as the search coil to absorb the magnetizer. One-piece slender structure, the slender structure can be one-section Z-axis, two-section Z-axis, three-section Z-axis or N-section Z-axis, by increasing the cross-sectional area of ​​X-axis and Y-axis turns and increasing Z The number of shaft segments, by increasing the number of turns on the Z axis, achieves high open-loop sensitivity, and finally improves the resolution of the fluxgate magnetometer and the resolution of the search coil magnetometer.

Embodiment 2

[0024] A kind of purposes of multifunctional magnetometer, the first step, the coil in the middle of the feedback winding of described multifunctional magnetometer is used as the measuring coil of fluxgate type, and described built-in magnetic core is used as fluxgate type switch magnetism The core produces an accurate and uniform feedback magnetic field, realizes accurate fluxgate measurement, and ensures high resolution of the weak AC magnetic field superimposed on the DC magnetic field, which is used to accurately measure the DC magnetic field;

[0025] In the second step, the coil in the middle of the feedback winding of the multifunctional magnetometer is used as a search coil type search coil, and the built-in magnetic core is used as a search coil type adsorption magnetizer, and the feedback coil produces an accurate and uniform feedback magnetic field. The differential becomes proportional, the amplitude magnification of the AC magnetic field at each frequency is equal,...

Embodiment 3

[0028] In the working state of the fluxgate, an accurate and uniform feedback magnetic field is generated to realize accurate measurement of the fluxgate. In the working state of the search coil, the feedback coil generates an accurate and uniform feedback magnetic field, and the differential is converted into a ratio, so that the amplitude amplification of the AC magnetic field at each frequency is equal to obtain a flat amplitude-frequency characteristic. It can reflect the weak AC magnetic field after removing the DC magnetic field, and can be amplified to a sufficient amplitude for A / D conversion. The weak AC magnetic field superimposed on the DC magnetic field is obtained by the time cross-correlation of three signals: the feedback coil current in fluxgate mode, the differential of the feedback coil current, and the AC component of the feedback coil current. The weak AC magnetic field superimposed on the DC magnetic field is obtained by the closed-loop output in the searc...

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Abstract

The invention provides a multifunctional magnetometer with combination of a searching coil type and a flux-gate type. The multifunctional magnetometer comprises a feedback winding, a coil and a magnetic core, wherein the multifunctional magnetometer is provided with a sensitive shaft for measuring three magnetic-field components of one space point; the sensitive shaft adopts a thin-long space structure with integration of an X axis, a Y axis and a Z axis; the thin-long space structure can be provided with one section of Z axis, two sections of Z axes, three sections of Z axes or N sections of Z axes. The feedback winding adopts a Helmholtz coil structure and comprises a middle coil and an internal magnetic core. The invention also provides an application of the multifunctional magnetometer. The multifunctional magnetometer has the characteristics that the loop-opening sensitivity is high, the direct-current magnetic field is accurately measured, the weak alternating-current magnetic field overlaid in the direct-current magnetic field is accurately measured, the amplitude amplification factors of alternating-current magnetic fields with all frequencies are equal, and the alternating-current magnetic fields work in the flux-gate mode or the searching coil mode in a time division way.

Description

technical field [0001] The invention relates to the field of magnetic force measurement, in particular to a multifunctional magnetometer combined with a search coil type and a fluxgate type and its application. Background technique [0002] Magnetometers that measure the strength of the Earth's magnetic field can be divided into two categories: absolute magnetometers and relative magnetometers. The main purpose is to collect magnetic anomaly data and determine rock magnetic parameters. From the 20th century to the present, the magnetometer has experienced the development process from simple to complex, from mechanical principles to modern electronic technology. The accuracy of the measured value of the absolute magnetometer is determined by the instrument itself, and the accuracy of the measured value of the relative magnetometer can only be determined after comparison with the absolute magnetometer, and the open-loop sensitivity of the probe is not high, and the resolution ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/02G01R33/04G01V3/40
Inventor 张跃林原李攀攀曹晨啸
Owner BEIJING NATESILA SCI & TECH CORP
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