Three-axial magnetometer correcting method and three-axial magnetic gradient correcting method

A calibration method and three-axis magnetic technology, applied in the direction of the size/direction of the magnetic field, instruments, measuring devices, etc., can solve the problems of excessive site area requirements, small site area requirements, background magnetic field errors, etc., and achieve small site area requirements , low equipment requirements and high work efficiency

Inactive Publication Date: 2010-09-29
WUHAN UNIV
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Problems solved by technology

[0007] Another purpose of the present invention is to solve the technical problems existing in the prior art that the operating time is long, the site area is too large, the background magnetic field may change and cause errors, and the turntable requires non-magnetic and precise rotation requires too high equipment requirements. ; Provide a three-axis magnetometer calibration method and a three-axis magnetic gradiometer calibration method with short operation time, small site area requirements, and low equipment requirements

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  • Three-axial magnetometer correcting method and three-axial magnetic gradient correcting method
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  • Three-axial magnetometer correcting method and three-axial magnetic gradient correcting method

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Embodiment 1

[0039] a. Compensate the background magnetic field in the working area: Compensate the magnetic field in the center of the homogeneous area of ​​the triaxial Helmholtz coil to a level where the magnetic field value is less than 1nT. According to the current level of compensation technology, the residual magnetic field of each component of the three-axis coil can be kept at a level less than 1nT in a short period of time (10 minutes).

[0040] b. Test the coil constants of the three axes of the magnetic field coil: taking the X axis as an example, apply a current value of 60A in the positive and negative directions of the same direction to the X axis of the three axis coil in step a. Record the applied current value and the corresponding output value of the scalar magnetometer placed in the center of the uniform area of ​​the above-mentioned three-axis coil, and calculate the coil constant on each axis of the above-mentioned three-axis coil, and divide the sum of these two outpu...

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Abstract

The invention relates to a magnetometer correcting method and a magnetic gradiometer correcting method, in particular to a three axis magnetometer correcting method and a three axis magnetic gradiometer correcting method. Under the conditions of no standard three-axis coil, no standard magnetic field and no normalized three-axis magnetometer, the invention corrects the error and carrier magnetic interference generated due to the inconsistent nonorthogonality, interaxial coupling and sensitivity of the three axis magnetometer and the three axis magnetic gradiometer. The invention adopts an ordinary three-axis coil, a scalar quantity magnetometer and a high precision current source to form a correcting device which has the correcting precision at the same order of magnitude as the single axis test precision of a corrected three axis magnetometer. The invention does not need to turn a corrected three axis magnetometer and a corrected three axis magnetic gradiometer during correcting, thereby having a simple operation process and high correcting precision and improving the test precision of magnetic field vector by the three axis magnetometer and the three axis magnetic gradiometer.

Description

technical field [0001] The invention relates to a magnetometer calibration method and a magnetic gradiometer calibration method, in particular to a three-axis magnetometer calibration method and a three-axis magnetic gradiometer calibration method. Background technique [0002] Due to the machining and assembly errors of the three-axis magnetometer and the three-axis magnetic gradiometer probe, the coil winding error, the asymmetric error of the magnetic core, etc., the three magnetic axes are not orthogonal and have mutual coupling effects, and the three-axis sensitivity also exists. The slight difference, which will seriously affect the vector test accuracy of the three-axis magnetometer and three-axis magnetic gradiometer, must be corrected. The correction methods currently used mainly include: [0003] 1. Operate the magnetometer to rotate in all directions in the geomagnetic field to make it "experience in all directions" as much as possible, and form an equation with ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R35/00G01R33/02G01C17/02
Inventor 卢卓宇刘斯张俊杰蒋昌忠
Owner WUHAN UNIV
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