Space magnetic field and full-tensor gradient measurement system and method based on spatial correlation

A technology of spatial correlation and spatial magnetic field, applied in magnetic gradient measurement, magnetic field measurement using the principle of magnetic flux control, magnetic field measurement using electromagnetic devices, etc., can solve the problems of difficult construction and high cost, and achieve easy construction and low cost , the effect of good application prospects

Active Publication Date: 2013-09-11
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if it is necessary to obtain different magnetic field gradients at the same time, multiple detectors are required to be distributed in a three-dimensional array, so it is not easy to build and the cost is high

Method used

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  • Space magnetic field and full-tensor gradient measurement system and method based on spatial correlation
  • Space magnetic field and full-tensor gradient measurement system and method based on spatial correlation
  • Space magnetic field and full-tensor gradient measurement system and method based on spatial correlation

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Embodiment 1

[0030] The invention relates to a spatial magnetic field measurement system based on spatial correlation, which includes a first fluxgate meter, a second fluxgate electric driver and a digital acquisition system. The distance between the first fluxgate meter and the second fluxgate meter is 1-10 meters, and they are parallel to each other. figure 1 is a schematic diagram of the measurement system. The computer in the picture can control the movement of the electric drive device and collect the readings of the two fluxgate meters at the same time. figure 2 It is a schematic diagram of the spatial correlation of the magnetic field in a certain direction. Curves 1 and 2 in the figure are respectively the fluctuation curves of the ambient magnetic field measured by the two fluxgate meters in a static state. It can be seen from the figure that the spatial correlation is very good.

[0031] image 3 It is a schematic diagram of the measurement principle of a survey line. Among t...

Embodiment 2

[0034] The method for using the measurement system of the present invention comprises the following steps:

[0035] (1) Put the second fluxgate meter at a distance of 1-10 meters from the first fluxgate meter, keep the two parallel to each other, then fix the first fluxgate meter, connect the second fluxgate meter with the motor The driver is connected and moves in a straight line at a uniform speed, and the outputs of the first fluxgate meter and the second fluxgate meter are collected synchronously by the digital acquisition system;

[0036] (2) Subtract the readings in three directions of the first fluxgate meter from their respective initial values ​​to obtain the variation of the spatial magnetic field with time;

[0037] (3) Subtract the variation in the corresponding direction of the first fluxgate meter from each component of the second fluxgate meter to obtain the three components of the magnetic field at each point on the survey line;

[0038] (4) Make a two-dimensi...

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Abstract

The invention relates to a space magnetic field and full-tensor gradient measurement system and method based on spatial correlation. The measurement system is characterized by comprising a first flux-gate magnetometer, a second flux-gate magnetometer, an electric driver and a digital acquisition system, a certain distance is reserved between the first flux-gate magnetometer and the second flux-gate magnetometer, and directions of three axes are parallel to one another; the first flux-gate magnetometer keeps stationery in the measuring process to serve as a reference; the second flux-gate magnetometer is fixed at the movable end of the electric driver and can reciprocate parallelly; each flux-gate magnetometer outputs by three axes. The system is easy to set up, low in cost, simple to process and capable of obtaining accurate space magnetic field distribution; meanwhile, close-range arrangement of the flux-gate magnetometers is avoided, mutual interference of the flux-gate magnetometers can be eliminated to the utmost degree, and the method has good application prospects in applications of ultra-low field nuclear magnetic resonance and imaging thereof, biomagnetic research, magnetic geophysical exploration and the like.

Description

technical field [0001] The invention relates to a magnetic field environment assessment system and method, in particular to a spatial correlation-based space magnetic field and full tensor gradient measurement system and method. Background technique [0002] The magnetic field is a vector with direction and magnitude. In various magnetic field measurement applications, there are usually different methods such as total field measurement (scalar measurement), vector measurement, and gradient measurement. The full tensor gradient of the magnetic field has 9 gradient components, which contains more magnetic field information, and is the development direction of the future magnetic field measurement application. [0003] Under normal circumstances, the earth's environmental magnetic field is 30-50 microtesla (μT). Due to the influence of environmental objects, the magnetic field has spatial inhomogeneity and a large spatial gradient, but the laboratory environment usually reache...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/022G01R33/10
Inventor 邱隆清董慧侍文徐璐常宝林谢晓明
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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