Transient electromagnetic shallow full-wave exploration and measurement system

Abstract

The transient electromagnetic shallow full-wave exploration and measurement system comprises a transmitting module, a receiving coil system array, a depth movement control module, a data acquisition and control module, upper computer software and a high-power power supply, wherein the transmitting module is composed of a transmitting coil and a transmitting circuit; the receiving coil system arrayis composed of 64 receiving coils; the depth movement control module is composed of a stepping motor and an optical code wheel; the data acquisition and control module is composed of an FPGA controlcircuit, an ADS1278 acquisition circuit and a data storage circuit; and the upper computer software displays the processing data uploaded by the FPGA in real time, converts the data into a data formatand stores the data in a disk. According to the method, excitation and acquisition of shallow transient electromagnetic exploration data are realized, multiple times of coverage measurement are realized by changing the excitation position, continuous transient electromagnetic measurement waveforms are provided for shallow exploration, and the measurement efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of special instruments for resistivity interface measurement and evaluation in the exploration and construction of shallow layers on the earth's surface, and in particular relates to a transient electromagnetic shallow layer full-wave exploration measurement system. Background technique [0002] In the existing transient electromagnetic prospecting technology, both transmitting and receiving are on the ground. Since the current of the coil cannot be mutated, the response time of the transmitting circuit always exists. In addition, the propagation energy of electromagnetic waves on the ground and in space is relatively large, and a large amount of electromagnetic energy can be quickly transmitted into the formation near the transmitting coil. These two factors cause the ground transient electromagnetic prospecting method to have a measurement blind area, and it is impossible to measure the shallow layer effe...

AI Technical Summary

Problems solved by technology

These two factors cause the ground transient electromagnetic prospecting method to have measurement blind spots, and it is impossible to effectively measure shallow layers

Although the turn-off time of the transmitting coil has been improved and the size of the coil has been reduced, the problem of blind measurement areas cannot be overcome in principle.

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