Transient electromagnetic transmitting and receiving system for real-time acquisition and storage and data graphical interpretation

Abstract

The invention discloses a transient electromagnetic emitting-receiving system for real-time acquisition-storage and data mapping explanation. The system comprises an embedded computer, a signal conditioning module, a master control circuit, a Hall current sensor connected with an acquiring module; the embedded computer is connected with a data processing and imaging module, the master control circuit is connected with an emitting bridge circuit through a time sequence synchronous conversion circuit and a bridge circuit driving circuit; a constant voltage clamping circuit, an emitting power source module and an emitting coil are connected with the emitting bridge circuit; the emitting coil is connected with a damping matching absorbing circuit and the Hall current sensor; the system is capable of intuitively displaying the emitting current waveform and acquiring the signal waveform, and accurately adjusting the clamping voltage value and the damping matching resistance value according to the difference of the specific environment and the emitting coil, so that the emitting current waveform can be the optimal; the embedded computer is capable of storing the acquired data and transmitting to the data processing and imaging module in real time so as to perform the data mapping explanation and obtain the content and distribution condition of matters in real time.

Description

technical field [0001] The invention belongs to geophysical detection instruments, in particular to a transient electromagnetic transmitting and receiving system for real-time collection and storage and data graphic interpretation. Background technique [0002] Transient Electromagnetic Methods (TEM), also known as time-domain electromagnetic method, is a very widely used geophysical detection method. The pulse current excites a pulse field, and receives the induced secondary electromagnetic field during the intermittent period of the primary pulse field, and obtains the structure and distribution information of the underground material through the study of the induced secondary field. [0003] The existing transient electromagnetic instrument data acquisition and data processing require a certain time interval between imaging and real-time data interpretation, which leads to low construction efficiency, and because the distribution and content of underground substances cann...

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Problems solved by technology

[0003] The existing transient electromagnetic instrument data acquisition and data processing require a certain time interval between imaging and real-time data interpretation, which leads to low construction efficiency, and because the distribution and content of underground substances cannot be judged in time, so There is a certain degree of blindness in the process of engineering construction, resulting in a waste of manpower and material resources to varying degrees;

[0004] In the existing transient electromagnetic instruments, the transmitter and the receiver are separated, and two independent control systems are used. The coordination of the two systems is poor, and the control mode is complex and cumbersome. Due to the long distance, it is impossible to complete the work by one person and one machine ;The separated transient electromagnetic instrument is composed of many modules, and the cumbersome assembly process leads to the reduction of efficiency and reliability in the process of engineering application, and the transportation of the instrument is inconvenient;

[0005] Existing transient electromagnetic instruments still have unfriendly man-machine interface, which leads to unintuitive display of emission current waveform and signal acquisition waveform

The existing transient electromagnetic emission system control unit is mainly based on the single-chip microcomputer architecture. The sequence design of the single-chip microcomputer adopts a sequential execution method, and there will be a certain time delay. The shutdown time of the transient electromagnetic emission system is very short, and the transient electromagnetic In the method, the off-time requirement of the emission system is relatively high, so a small delay will reduce the accuracy of data processing and imaging;

[0006] Existing transient electromagnetic instruments still have problems such as long turn-off time of the emission current waveform, poor linearity, and tail oscillation. At present, most transient electromagnetic instruments use energy-feeding active constant voltage clamping methods and complex control systems. , the reliability is reduced, and there is also the problem that the clamping voltage and matching resistance cannot be adjusted, and it is impossible to optimize the emission current waveform according to the different experimental environments and different real-time adjustments of the transmitting coil.

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