A Transient Electromagnetic Terrain Correction Method for Low Temperature Superconducting Magnetic Source Based on Anomalous Ring
A transient electromagnetic and low-temperature superconducting technology, which is used in electrical/magnetic exploration, geophysical measurement, and sound wave re-radiation, etc., can solve problems such as terrain correction that does not involve low-temperature superconducting magnetic sensors, and achieve the elimination of earth resistivity. Explain the effect of error
Active Publication Date: 2018-09-28
JILIN UNIV
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[0007] The purpose of the present invention is to solve the problem that none of the existing topographic correction methods for electromagnetic exploration involves the topographic correction of the measurement data of the low-temperature superconducting magnetic sensor, and to provide a low-temperature superconducting magnetic source based on an anomalous ring Transient Electromagnetic Terrain Correction Method
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[0029] see figure 1 , figure 2 , image 3 , Figure 4 and Figure 5 Shown:
[0030] The method for correcting the transient electromagnetic topography of the low-temperature superconducting magnetic source based on the anomalous ring provided by the present invention is as follows:
[0031] Step 1. Carry out the transient electromagnetic experiment of the ground magnetic source on a single-sloping mountain. The center method is adopted. The transmitting coil is laid according to the mountain into a square with a side length of 200. The Dewar must be placed vertically at the center of the transmitting coil;
[0032] Step 2: The transmitter excites the trapezoidal wave, and the low-temperature superconducting magnetic sensor is used to measure the magnetic field in the measurement area. After the measurement is completed, a closed abnormal ring is placed in the center of the transmitting coil, and the magnetic field measurement is performed again. For each measurement, use...
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The invention discloses a low-temperature superconducting magnetic source transient electromagnetic terrain correction method based on an abnormal ring. The method comprises following steps of: 1, conducting a ground magnetic field transient electromagnetic experiment on a single tilted mountain; 2, enabling a transmitter to excite a trapezoidal wave; 3, performing measurement two times at the central point of a transmitting coil by using a low-temperature superconducting sensor; 4, theoretically calculating the theoretical response Btheory of the abnormal ring; and 5, obtaining a correction factor. The method achieves terrain correction, eliminates earth resistivity interpretation error caused by a terrain influence, and finally achieves real earth resistivity interpretation imaging under the rugged terrain.
Description
technical field [0001] The invention relates to a terrain correction method based on an anomalous ring, in particular to a method for correcting a transient electromagnetic terrain of a low-temperature superconducting magnetic source based on an anomalous ring. Background technique [0002] At present, the transient electromagnetic method (Transient Electromagnetic Methods) is a time-domain geophysical prospecting method. Its measurement principle is that the medium will generate eddy current under the excitation of the primary current pulse field, and the eddy current will not disappear immediately during the pulse interruption, and the surrounding space will form a secondary magnetic field that decays with time. The attenuation law of the secondary magnetic field with time mainly depends on the conductivity, volume scale, buried depth of the conductor, and the shape and frequency of the emitted current. Therefore, the spatial distribution of the secondary field measured by...
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IPC IPC(8): G01V3/38
CPCG01V3/38
Inventor 嵇艳鞠杜尚宇赵艺王远关珊珊黎东升
Owner JILIN UNIV