Hardware composition proposal of three-dimensional resistivity imaging system

Abstract

The invention belongs to the technical field of geophysical exploration and relates to a hardware composition proposal of a three-dimensional resistivity imaging system. The invention comprises a hardware composition proposal applied in the scientific research application and a hardware composition proposal applied to engineering application; under the control of a notebook computer, a control command, a state data and a measurement data are transmitted by a mixed network composing of a CAN bus and a RS485 bus; an electrode switching device is adopted to select the communication of a power supply anode (A), a power supply cathode (B), a measurement common electrode (N), a measurement collecting electrode (M) and a polarization electrode or non-polarization electrode; a data collecting sub-station device carries out data collecting and data pre-processing; the pre-processed data is transmitted to the notebook computer for memory, analysis and calculation; and the resistivity distribution image is imaged and displayed at the measurement region.

Description

technical field [0001] The invention belongs to the technical field of geophysical exploration, in particular to the direct current method exploration technology applied in the technical field of resource and environmental exploration, and relates to a hardware composition scheme of a three-dimensional resistivity imaging system. Background technique [0002] As early as the beginning of the 19th century, the prospecting technology of direct current method has been developed for nearly 200 years. Since the development of high-density electrical technology in the 1980s, electrical prospecting technology has been developed rapidly and widely used. There are mainly four methods of high-density electric method in the exploration technology of DC method: ①High-density resistivity method-it adopts three-potential electrode system, including Wenner quadrupole, dipole and differential three-pole device, combined with computer technology, it can It is widely used in site geological ...

AI Technical Summary

Problems solved by technology

However, the on-site measurement of the instrument requires long-term observation

④ Spectrum IP method - also known as complex resistivity method, has achieved obvious prospecting results in metal deposits and oil and gas exploration, but the separation of IP effects and electromagnetic effects and the evaluation of IP anomalies have not been completely resolved

[0007] 1) Using a single RS485 bus is not suitable for designing a three-dimensional resistivity imaging system

Since no matter the current serial measurement method or parallel measurement method, a single RS485 bus is used for control and data transmission, the longest distance is only 1200 meters, and the data transmission speed is relatively slow

However, to design a three-dimensional resistivity imaging system, the required measurement area is relatively large, with many data points and a large amount of data. Therefore, the entire measurement process will take a long time (several hours or even dozens of hours), and environmental changes (such as temperature, humidity, etc.) etc.) will have a greater impact on the measurement results, resulting in more complex data collected, and theoretical interpretation (mathematical inversion) of 3D imaging will be difficult to become possible

Therefore, a single RS485 bus cannot be used to design a three-dimensional resistivity imaging system

[0008] 2) The signal conditioning circuit composed of hardware circuits is difficult to meet the requirements of the three-dimensional resistivity imaging system for data measurement accuracy, stability and consistency

On the other hand, because the components are easily affected by the environment such as temperature and humidity, the parameter drift, and the parameter drift after a long time will affect the three-dimensional resistivity imaging system.

And in the parallel measurement mode, each channel needs a signal conditioning circuit, which will affect the measurement accuracy due to the inconsistency of each channel, and at the same time make the circuit complicated and the reliability reduced

[0009] 3) The data acquisition system using single-chip microcomputer as the core cannot meet the needs of the 3D resistivity imaging system for the original data acquisition and preprocessing

On the one hand, if the collected raw data is directly transmitted to the computer (host computer), the requirements for the network bus under field working conditions are very high, and it is basically difficult to realize

At the same time, the computer needs to invert these data and image them. The amount of calculation is very large, which is difficult for a personal computer and may require a workstation to be competent.

On the other hand, since the single-chip microcomputer is mainly designed for control system applications, its operating speed and data width (8 or 16 bits) make it impossible to complete the acquisition and preprocessing tasks of the original data of the three-dimensional resistivity imaging system

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