SQUID-based magnetic source induced polarization-induction combined detection system and method

Abstract

The invention discloses an SQUID-based magnetic source induced polarization-induction combined detection system and method. The system comprises an emission unit and a reception unit. The emission unit is formed by a high-power transmitter, a non-inductive resistor, a current acquisition card and an emission loop, wherein the high-power transmitter and the non-inductive resistor are connected in series with the emission loop; the high-power transmitter, the non-inductive resistor and the emission loop form a closed loop; and the current acquisition card is connected in parallel at the two ends of the non-inductive resistor, and is used for collecting emission current in the emission loop. The reception unit is formed by a low-temperature SQUID sensor and a receiver. The method comprises the following steps: 1) paving the emission loop; 2) connecting the non-inductive resistor in series in the emission loop; 3) carrying out emission unit and reception unit synchronous transmission; 4) removing a primary field; and 5) carrying out resistivity-depth imaging. The beneficial effects are that the system meets the characteristics of fast signal attenuation and large bandwidth in the early stage, and also meets the characteristic of large efficient signal dynamic range (>140 dB).

Description

technical field [0001] The invention relates to a joint detection system and method, in particular to a SQUID-based magnetic source excitation polarization-induction joint detection system and method. Background technique [0002] At present, traditional transient electromagnetic systems use coils or magnetic rods as receiving sensors, which are mainly used in non-polarizable ground. In polarizable land, due to the influence of the polarization effect, the attenuation curve generally decays rapidly in the early stage, enters a negative value in the middle stage, and reappears a positive value in the late stage. The traditional transient electromagnetic detection system generally uses a coil or a very narrow bandwidth The magnetic sensor (magnet rod) receives, because there is a transition process in the early stage of the coil, and the weak attenuation signal cannot be detected in the late stage, so it cannot be effectively detected in the earth containing polarized media. ...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a SQUID-based magnetic source excitation polarization-induction combined detection system and method in order to solve the deficiencies of the existing transient electromagnetic system in the ground detection with polarization

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