Method and device for high-accuracy field measurement of terrestrial magnetism vectors

A field measurement, high-precision technology, used in measurement devices, geophysical measurements, radio wave measurement systems, etc., can solve the problems of geomagnetic vector measurement equipment not suitable for high-precision measurement, and complicated and tedious preparations for instrument installation and adjustment.

Active Publication Date: 2014-07-23
CHINA METALLURGICAL GEOLOGY BUREAU GEOLOGICAL EXPLORATION INST OF SHANDONG ZHENGYUAN
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  • Abstract
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  • Application Information

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Problems solved by technology

However, the axis of the orthogonal coil on the probe needs to be adjusted to the orientation orthogonal to the geomagnetic field vector T to be measured in the horizontal plane and the meridian plane respectively. Fixed seismic and geomagnetic observation stations with known magnetic field declination D, measuring the offset variation of geomagnetic dip I and declination D over time
Therefore, the existing geomagnetic vector measurement equipment and technology are not suitable for high-precision measurement in the field prospecting environment

Method used

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  • Method and device for high-accuracy field measurement of terrestrial magnetism vectors
  • Method and device for high-accuracy field measurement of terrestrial magnetism vectors

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Experimental program
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Effect test

Embodiment 1

[0106] Measure the geomagnetic vector with the device used by the high-precision geomagnetic vector field measurement method of the present invention, place the tripod in the device used by the high-precision geomagnetic vector field measurement method on the intended observation position, and make the circular vial plane on the top of the tripod Roughly in the center; adjust the leveling knob of the tripod so that the two vertical and horizontal vials on the coil are in the center state, and use the collimator to align with the ground direction mark set in advance according to the azimuth angle D0 of the section. At this time, the azimuth angle of the horizontal coil is D0 , the measurement steps are as follows:

[0107] 1. The total field magnetometer probe 14 is installed at the coincident place of the geometric center of the vertical coil and the horizontal coil, and the total field magnetometer probe 14 is connected with the total field magnetometer 22 by a wire;

[0108]...

Embodiment 2

[0124] Measure the geomagnetic vector with the device used by the high-precision geomagnetic vector field measurement method of the present invention, place the tripod in the device used by the high-precision geomagnetic vector field measurement method on the intended observation position, and make the circular vial plane on the top of the tripod Roughly in the center; adjust the tripod leveling knob so that the two vertical and horizontal vials on the vertical coil are in the center state. At this time, the axis of the vertical coil is in a vertical state. The measurement steps are as follows:

[0125] ① Place the probe of the total field magnetometer in the middle of the vertical coil, and the vertical coil is installed on the tripod, and the vertical coil is a Helmholtz coil;

[0126] ② Connect the vertical coil to the excitation power supply through a wire, and set a band switch on the excitation power supply;

[0127] ③Adjust the switch of the excitation power supply so ...

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Abstract

The invention provides a method and device for high-accuracy field measurement of terrestrial magnetism vectors. A tripod, a perpendicular coil and a total field magnetometer are utilized to measure a synthesized magnetic field value T-1 and a synthesized magnetic field value T-2 of a normal terrestrial magnetic field To without an additional magnetic field, a perpendicularly-upward magnetic field Tf additionally arranged for a terrestrial magnetic field and a double perpendicularly-upward magnetic field 2Tf additionally arranged for the terrestrial magnetic field, and please see the specification for the expression of the calculation formula; a horizontal coil is arranged, the geometric center of the perpendicular coil and the geometric center of the horizontal coil are made to coincide with each other, the total field magnetometer is utilized to measure a synthesized magnetic field value T+ / / and a synthesized magnetic field value T- / / after a horizontal forward magnetic field and a horizontal reversed magnetic field are additionally arranged for the terrestrial magnetic field, a terrestrial magnetism declination is calculated, and please see the specification for the expression of the calculation formula, wherein DO is equal to the value of the included angle between the axis of the horizontal coil and the geographical north direction and is a known preset value. Only the coils need to be horizontally adjusted before observation, and the method and device are suitable for large-area rapid measurement in geophysical exploration field general survey operation.

Description

technical field [0001] The invention relates to the technical field of fine measurement of the geophysical geomagnetic field, and relates to a high-precision geomagnetic vector field measurement method and a device thereof. Background technique [0002] Geomagnetic vector measurement can effectively reduce the multi-solution in geophysical exploration and inversion, and contribute to the qualitative and quantitative interpretation of magnetic bodies. At present, the geomagnetic field measurement instruments commonly used by geophysical prospecting workers at home and abroad are ordinary proton magnetometers, optical pump magnetometers or overhauser proton magnetometers. These magnetometers are easy to use in the field, and the measurement accuracy has reached or better than 1nT. They can measure the scalar value of the total geomagnetic field strength. However, the total field magnetometer cannot measure the geomagnetic vector. A fluxgate three-component magnetometer with l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/40
CPCG01V1/00G01V3/40G01V2200/00E21B10/00
Inventor 高建东
Owner CHINA METALLURGICAL GEOLOGY BUREAU GEOLOGICAL EXPLORATION INST OF SHANDONG ZHENGYUAN
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