Method for inverting magnetic susceptibility tensor based on magnetic gradient tensor
A magnetic gradient tensor and magnetic susceptibility technology, which is applied in the measurement of magnetic susceptibility, material magnetic variables, and magnetic properties. Eliminate the influence of geographic location and time-varying magnetic field, and the effect of convenient measurement
Active Publication Date: 2021-02-05
JILIN UNIV
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[0006] The purpose of the present invention is to provide a method for inverting and solving the magnetic susceptibility tensor using magnetic gradient tensor data, so as to solve the problem that the existing magnetic measurement method requires special measuring instruments, and is easily affected by the geographical location and time-varying magnetic field, so it cannot be obtained. The problem with complete susceptibility tensor information
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[0029] The rock samples and the magnetic gradient tensor are placed as follows: figure 1 , where r is the distance between the magnetic gradient tensor and the center of the rock sample, and X, Y, Z are the coordinate system of the rock sample.
[0030] Such as figure 2 As shown, the present invention is based on the magnetic gradient tensor inversion method for the magnetic susceptibility tensor, comprising the following steps:
[0031] A, the rock sample (cube or cylinder type) is placed on the three-axis non-magnetic turntable 3, and the magnetic gradient tensor 1 is placed on the X-axis under the X-Y-Z coordinate system where the rock sample is located at the center r of the rock sample, wherein, The position where r is placed meets the requirement that the signal-to-noise ratio of the tensor meter is greater than 10dB (to ensure that the relative error of the calculation result is less than 5%), such as figure 1 shown;
[0032] B. Calibrate the magnetic gradient tenso...
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The invention relates to a method for inverting a magnetic susceptibility tensor based on a magnetic gradient tensor. The method comprises the following steps of: placing a rock sample on a non-magnetic turntable, and placing a magnetic gradient tensor instrument on an XY plane of a coordinate system in which the rock sample is located along an X axis at a distance r from the center of the rock sample; adjusting the output of the magnetic gradient tensor instrument to be zero rotating the non-magnetic turntable around the Z axis by 45 degrees, 90 degrees and 135 degrees, and respectively measuring G data by using the magnetic gradient tensor instrument; rotating the rock sample by 90 degrees around the X axis of the coordinate system where the rock sample is located, so as to enable its Zaxis to be located in the horizontal plane; measuring G data by using the magnetic gradient tensor instrument; measuring multiple groups of data to obtain an average value; and acquiring magnetic susceptibility tensor data information. According to the method, the influence of geographical positions and time-varying magnetic fields can be well eliminated by utilizing the magnetic gradient tensor data, so that complete magnetic susceptibility tensor information is obtained; a special magnetic susceptibility tensor measuring instrument is not needed, the actual measurement is more convenient, and the measurement result and the special magnetic susceptibility tensor instrument can be mutually verified.
Description
technical field [0001] The invention belongs to the technical field of magnetic susceptibility tensor measurement, in particular to a rock sample-based magnetic gradient tensor testing method, in particular to a magnetic susceptibility tensor inversion method based on the magnetic gradient tensor. Background technique [0002] The certain directionality shown in the spatial distribution and relative proportion configuration of mineral particles or mineral crystals inside the rock should also be reflected in its related physical properties. The magnetic susceptibility tensor of rock ore is the rock magnetic field. one of the nature of science. The magnetic susceptibility tensor of rock ore contains rich geological information, which plays an important role in solving geological problems such as geological structure and rock formation. In addition, measuring only the susceptibility tensor of rocks is much faster than conventional rock fabric measurements. Therefore, in geolo...
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IPC IPC(8): G01R33/16G01N27/72
CPCG01N27/72G01R33/16
Inventor 随阳轶张明维王梓骁王康程浩刘世斌刘珂王莹张子博
Owner JILIN UNIV