A Method of Inverting Magnetic Susceptibility Tensor Based on Magnetic Gradient Tensor
A technology of magnetic gradient tensor and magnetic susceptibility, which is applied in magnetic susceptibility measurement, material magnetic variable, magnetic property measurement, etc., can solve the problems that the information of magnetic susceptibility tensor cannot be obtained, and it is easily affected by geographical location and timely variable magnetic field. Eliminate geographical location and time-varying magnetic field, geographical location has little influence, and the effect of small influence
Active Publication Date: 2021-08-31
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) 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 tensor 1 s...
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The invention relates to a method for inverting the magnetic susceptibility tensor based on the magnetic gradient tensor, comprising placing the rock sample on a non-magnetic turntable, and placing the rock sample at a distance r from the center of the rock sample along the X axis on the XY plane of the coordinate system where the rock sample is located Magnetic gradient tensor; the output of the magnetic gradient tensor is zeroed; rotate the non-magnetic turntable around the Z axis by 45°, 90°, and 135°, and use the magnetic gradient tensor to measure G respectively. ij Data; rotate the rock sample 90° around the X-axis of the coordinate system where the rock sample is located, so that the Z-axis is in the horizontal plane; use a magnetic gradient tensor to measure G ij Data; measure multiple sets of data to obtain the average value; obtain magnetic susceptibility tensor data information. The invention utilizes the magnetic gradient tensor data to well eliminate the influence of geographic location and time-varying magnetic field, and obtain complete magnetic susceptibility tensor information; no special magnetic susceptibility tensor measuring instrument is needed, which is more convenient in actual measurement, and The measurement results can be mutually verified with a special magnetic susceptibility tensor.
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