A full range transient electromagnetic synchronous sounding device

Abstract

The invention discloses a full range transient electromagnetic synchronous sounding device, comprising a transmitting coil, a double receiving coil and a matching multi-channel receiver; the double receiving coil is composed of a first receiving coil and a second receiving coil, The second receiving coil is located in the first receiving coil and both are in the same plane, adopting the form of a common center point; the transmitting coil is located on the periphery of the dual receiving coils. Combined in the form of a common center point or a common central axis and keep a gap between them. The invention can realize synchronous acquisition of double coil signals. The size of the transmitting coil is larger than that of the receiving coil, which can reduce the influence of mutual inductance, improve the signal-to-noise ratio and sensitivity; the double receiving coil-dual-channel synchronous measurement device can realize the effective measurement of the late field signal and the early field signal respectively, so as to ensure the deep On the basis of the detection ability, the detection blind area is reduced, and the shallow detection effect is improved; the traditional center loop measurement device is not changed, and the detection construction is convenient.

Description

technical field [0001] The invention relates to a transient electromagnetic full-depth measuring device, in particular to a full-range transient electromagnetic synchronous sounding device. Background technique [0002] The transient electromagnetic method belongs to the time-domain electromagnetic method (TEM), which is a time-domain artificial source electromagnetic detection method based on the principle of electromagnetic induction. Using an ungrounded loop (magnetic source) or a grounded line source (galvanic source) to send a pulsed magnetic field underground, under its excitation, the induced eddy current excited in the underground geological body will generate an induced electromagnetic field that changes with time (secondary Field), according to the characteristics of the quadratic field attenuation curve to judge the electrical properties, scale, and occurrence of underground geological bodies (citation: Niu Zhilian. Principles of time-domain electromagnetic method...

AI Technical Summary

Problems solved by technology

[0003] For the time domain, the detection depth is determined by the time of observation. At present, almost all the late signals are recorded by TEM instruments, or only late signals are used in data processing. This situation will have two consequences: first , it loses the ability of the TEM method to detect the shallow structure, because the information of the shallow structure is mainly carried by the early signal; second, it reduces the resolving power of the TEM method, because the influence of the current shutdown will distort the transient response , therefore, in the actual measurement, people discard the distorted early signal, and only record the late signal after this moment, the effective detection depth is only below the depth that the signal can propagate at this moment, and there is a detection blind zone

Images