Time-frequency electromagnetic data collection device and method based on extremely-low-frequency electromagnetic source

A time-frequency electromagnetic and data acquisition technology, which is applied in the field of geophysical exploration, can solve problems such as low signal-to-noise ratio, weak time-frequency electromagnetic signal, and inability to collect time-frequency electromagnetic data, and achieve stable signal amplitude, small propagation attenuation, Wide coverage effect

Pending Publication Date: 2020-08-25
OPTICAL SCI & TECH (CHENGDU) LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If there are no more roads around the construction area and within the construction area, there is no way to carry out large-scale three-dimensional time-frequency electromagnetic survey data acquisition operations, or because the time-frequency electromagnetic data acquisition station is far away from the high-

Method used

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  • Time-frequency electromagnetic data collection device and method based on extremely-low-frequency electromagnetic source
  • Time-frequency electromagnetic data collection device and method based on extremely-low-frequency electromagnetic source
  • Time-frequency electromagnetic data collection device and method based on extremely-low-frequency electromagnetic source

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Effect test

Embodiment 1

[0036] like figure 1 and figure 2 , a time-frequency electromagnetic data acquisition device based on an extremely low-frequency electromagnetic source, including a high-power controllable current source transmission control device 1, an extremely low-frequency long-distance transmitting antenna 2 and a ground time-frequency electromagnetic signal receiving and collecting device 3. The high-power controllable current source transmission control device 1 provides high-power controllable alternating current to the extremely low-frequency long-distance transmitting antenna 2; the extremely low-frequency long-distance transmitting antenna 2 transmits the high-power controllable alternating current The variable current is directly fed into the ground; the extremely low-frequency long-distance transmitting antenna 2 is two mutually orthogonal long-distance grounding long wires located at the extremely low-frequency high-power controllable current source transmitting station. The l...

Embodiment 2

[0049] The difference with embodiment 1 is mainly, as figure 2 As shown, the described ground time-frequency electromagnetic signal receiving and collecting device 3 is a ground wired time-frequency electromagnetic signal receiving and collecting device, including a wired time-frequency electromagnetic data collecting module 21, a three-component magnetic field sensor 22 and a three-component electric field sensor 23. The ground wired time-frequency electromagnetic signal receiving and collecting device is connected with the instrument car 4 through a cable 5, and the cable 5 of the present embodiment is an armored cable;

[0050] The three-component magnetic field sensor 22 of the wired time-frequency electromagnetic data acquisition device is three mutually orthogonal induction coil type magnetic field sensors or fluxgate type magnetic field sensors or superconducting magnetic field sensors or cold atom magnetic field sensors, and the three-component electric field sensor 23...

Embodiment 3

[0054] like image 3 The difference between embodiment 2 and embodiment 1 is that the ground time-frequency electromagnetic signal receiving and collecting device 3 is a ground wireless remote control time-frequency electromagnetic signal receiving and collecting device. The ground wireless remote control time-frequency electromagnetic signal receiving and collecting device includes a wireless remote control time-frequency electromagnetic data collecting module 31, a three-component magnetic field sensor 22 and a three-component electric field sensor 23, and the ground wireless remote control time-frequency electromagnetic signal receiving and collecting device passes a wireless The remote control signal and the instrument car 4 communicate with each other, and the high-speed wireless data transmission module 6 and the transmitting antenna 7 built in the ground wireless remote control time-frequency electromagnetic signal receiving and collecting device send the collected time-...

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Abstract

The invention provides a time-frequency electromagnetic data collection device and method based on an extremely low frequency electromagnetic source. The high-power controllable current source emission control device provides high-power controllable alternating current for the extremely-low-frequency long-distance emission antenna, and the extremely-low-frequency long-distance emission antenna directly feeds the high-power controllable alternating current into the ground through grounding electrodes at the two ends of a grounding long wire. The ground time-frequency electromagnetic signal receiving and collecting device is in communication connection with an instrument vehicle arranged in the middle of a work area, and the instrument vehicle is provided with a computer for time-frequency electromagnetic collection, control, processing and data storage processing. And a computer on the instrument truck controls the ground time-frequency electromagnetic signal receiving and collecting device to collect time-frequency electromagnetic data. According to the method, the waveguide characteristic of the manually-transmitted extremely-low-frequency high-power alternating electromagnetic signals between the ground and the ionized layer is fully utilized, the signals are transmitted to a measurement work area thousands of kilometers away, the time-frequency electromagnetic data collection efficiency is improved, the signal-to-noise ratio of the time-frequency electromagnetic data is increased, and the operation cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of geophysical exploration, in particular to a time-frequency electromagnetic data acquisition device and method based on an extremely low-frequency electromagnetic source. Background technique [0002] Geophysical exploration methods mainly include seismic method, direct current method, magnetic method, gravity method and electromagnetic method. Among them, the electromagnetic method is also called the "electromagnetic induction method". According to the difference in the conductivity and permeability of rocks or ores, the method of using the principle of electromagnetic induction to carry out prospecting and exploration is collectively referred to as the electromagnetic method. [0003] Among them, the application of surface time-frequency electromagnetic prospecting technology has played an important role in the joint interpretation of structural belts and special targets, and the joint detection and eval...

Claims

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Application Information

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IPC IPC(8): G01V3/10
CPCG01V3/10
Inventor 余刚宋喜林刘学军王志刚陈娟王熙明夏淑君
Owner OPTICAL SCI & TECH (CHENGDU) LTD
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