Electromagnetic excitation response signal mutual inductance device, detection device and detection method

Abstract

The invention relates to an electromagnetic excitation response signal mutual inductance device, a detection device and a detection method. The electromagnetic excitation response signal mutual inductance device comprises a detector and a comparator arranged in a geometric position of the detector; the detector comprises a main excitation source and a main receiving probe; the comparator comprisesa standby excitation source and a standby receiving probe; the main excitation source and the standby excitation source are connected in parallel or in series; and the main receiving probe and the standby receiving probe are reversely connected in parallel or in series. Compared with the prior art, the electromagnetic excitation response signal mutual inductance device, the detection device and the detection method have the advantages that a signal comparator is used for following the detector in real time, a primary field signal caused by a signal magnetic field is reduced in an analog circuit, no matter what the excitation signal is, the primary field signal of the excitation signal can be completely inhibited, and the device is low in manufacturing cost.

Description

technical field [0001] The invention relates to the field of physical detection, in particular to an electromagnetic excitation response signal mutual induction device, a detection device and a detection method. Background technique [0002] Based on the principle of electromagnetic induction, the use of electromagnetic excitation response to realize non-destructive testing, flaw detection or geophysical exploration has many advantages such as no need to contact objects, simple equipment, high detection efficiency and low equipment cost. [0003] However, whether it is eddy current detection or transient electromagnetic method exploration in geophysical exploration, the launch system needs to launch the excitation electromagnetic field through the emission wire frame during implementation, and collect and record the electromagnetic response signal during or after the field excitation. This electromagnetic response signal includes both the mutual inductance signal of the tran...

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Problems solved by technology

[0005] The patent document with the application number 201110424903.9 discloses the gradient measurement mode, the middle coil transmits, and the transmitting coil is a certain distance away from the surface of the measured medium, and the excitation strength of the primary field is discounted; in addition, due to geometrical constraints, the two receiving coils or sensors The geometric distance cannot be too large, and the amplitude of the obtained gradient signal will also be restricted, and there is no fundamental solution to the problem that the transmitting and receiving coils are close to the target surface at the same time.

[0006] The patent document with the application number 201410092714.X discloses the equivalent reverse magnetic flux measurement mode, and the two transmitting coils are fed with reverse currents. Obviously, the excitation signal of the primary field is greatly weakened, which limits the exploration capability and has no fundamental Solve the problem of sending and receiving coils close to the target surface at the same time

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