CN114814952A - Three-dimensional time domain-based induced polarization data acquisition method and device - Google Patents
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Abstract
The invention belongs to the technical field of data acquisition, and provides a method and a device for acquiring induced polarization data based on a three-dimensional time domain, wherein the method for acquiring the induced polarization data of the two-dimensional time domain is modified to be used for three-dimensional induced polarization measurement, so that the three-dimensional data acquisition of an induced polarization signal is simplified; electrodes in the three-dimensional time domain induced polarization measuring line are equally divided into a power supply electrode and a measuring electrode, the power supply electrode is only used for supplying power, the measuring electrode is only used for measuring, different cables are functionalized, cables numbered in an odd number use stainless steel electrodes as power supply cables, cables numbered in an even number use non-polarized electrodes as measuring cables to finish measurement, and then the power supply electrode and the cables are exchanged to carry out mirror image measurement; recoding the electrode address file and the coordinate file in the measurement protocol so that the data format can be automatically exported. The data quality and the data acquisition and processing efficiency of the three-dimensional induced polarization measurement are improved.
Description
Technical Field
The invention belongs to the technical field of data acquisition, and particularly relates to a method and a device for acquiring induced polarization data based on a three-dimensional time domain.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
In recent years, the induced polarization technology is gradually applied to the hydrogeology field and the environmental geophysical field, such as the determination of the distribution range of pollutants, the lithological characteristics of aquifers, water-salt migration paths and the like. The resistivity, polarizability and other parameters obtained by the time domain induced polarization method have definite physical relationship with hydrogeological parameters or pollutant content, and the uncertainty caused by measurement by a single high-density resistivity method can be effectively reduced. However, due to the influence of electrode polarization and electromagnetic coupling effect, the signal quality of the induced polarization is often not guaranteed. Especially in fields with high ground resistance or low background resistivity, the available time domain induced polarization data is hardly available using conventional data acquisition methods. This brings a great obstacle to the wider application of the time domain induced polarization method.
Disclosure of Invention
In order to solve at least one technical problem in the background art, the invention provides a method and a device for acquiring induced polarization data based on a three-dimensional time domain, which can effectively reduce the influence of electrode polarization and electromagnetic coupling in the three-dimensional induced polarization data acquisition process, improve the signal-to-noise ratio of the induced polarization data, acquire more accurate induced polarization signals, simplify the three-dimensional data acquisition of induced polarization by improving a two-dimensional induced polarization data acquisition method, and improve the induced polarization data acquisition and processing efficiency.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a method for acquiring induced polarization data based on a three-dimensional time domain, which comprises the following steps: the method comprises the following steps:
modifying based on a two-dimensional time domain induced polarization measurement protocol to obtain a protocol suitable for three-dimensional time domain induced polarization measurement;
on the basis of a three-dimensional time domain induced polarization measurement protocol, electrodes in a three-dimensional time domain induced polarization measurement line are equally divided into power supply electrodes and measurement electrodes, cables are classified according to parity of cable numbers to obtain power supply cables and measurement cables, the power supply electrodes are matched with the power supply cables, and the measurement electrodes are matched with the measurement cables to obtain a first measurement result;
exchanging the power supply electrode and the measuring electrode, correspondingly exchanging the power supply cable and the measuring cable, and carrying out mirror image measurement to obtain a second measuring result;
and obtaining three-dimensional time domain induced polarization data based on the first measurement result and the second measurement result.
The invention provides a device for acquiring induced polarization data based on a three-dimensional time domain, which is characterized by comprising an induced polarization data acquisition system and an electrode cable arrangement system;
the induced polarization data acquisition system comprises an electrical method instrument, a plurality of expansion boxes and a device connecting wire, wherein the device connecting wire is used for connecting the electrical method instrument and the expansion boxes or connecting the expansion boxes and the next expansion box;
the electrode cable arrangement system comprises a plurality of cables, and each cable is sequentially numbered;
each cable consists of two branch cables which are connected end to end, each branch cable is connected with a plurality of electrodes, and the electrodes are numbered in sequence; the electric method instrument and the expansion box are respectively connected with corresponding cables according to the serial numbers of the cables;
the electrical method instrument is used for setting measurement parameters, and measuring according to the measurement parameters and the matching of the cable and the electrode to obtain three-dimensional time domain induced polarization data.
Compared with the prior art, the invention has the beneficial effects that:
the invention uses the modified two-dimensional multi-gradient array to carry out three-dimensional induced polarization data acquisition work, functionalizes different cables, and uses one part of the cables as a power supply cable and the other part of the cables as a measurement cable; by adopting the mode, the two-dimensional measurement method is expanded to the three-dimensional measurement of induced polarization, and the design work of a measurement protocol is simplified.
According to the invention, the electrodes of the odd-numbered cables are arranged to be stainless steel electrodes as power supply cables, and the electrodes of the adjacent even-numbered cables are arranged to be non-polarized electrodes or stainless steel electrodes as measurement cables, so that the adverse effect of electrode polarization and electromagnetic coupling on the quality of induced polarization data is reduced.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a flowchart illustrating a measurement operation principle according to a first embodiment of the present invention;
FIG. 2 is a graph showing the result of induced polarization decay curve according to the first embodiment of the present invention;
FIG. 3 is a schematic diagram of the three-dimensional time domain induced polarization measurement according to the second embodiment of the present invention;
fig. 4 is a schematic layout view of the wire electrode according to the second embodiment of the present invention.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In the present invention, terms such as "upper", "lower", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only terms of relationships determined for convenience in describing structural relationships of the components or elements of the present invention, and are not intended to refer to any components or elements of the present invention, and are not to be construed as limiting the present invention.
In the present invention, terms such as "connected" and "connecting" should be interpreted broadly, and mean either a fixed connection or an integral connection or a detachable connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be determined according to specific situations by persons skilled in the relevant scientific or technical field, and are not to be construed as limiting the present invention.
Example one
As shown in fig. 1, the present embodiment provides a data acquisition method based on induced polarization in three-dimensional time domain, including the following steps:
s101, modifying based on a two-dimensional time domain induced polarization measurement protocol to obtain a protocol suitable for three-dimensional time domain induced polarization measurement;
firstly, the electrode address file and the coordinate file in the measurement protocol need to be recoded, so that the data format can be automatically exported. According to the size of the actual site, the proper number of cables is added, and the number of each cable, the electrode I D, the electrode address code, the electrode coordinates and the like are modified.
And (3) three-dimensionalizing the two-dimensional electrode file and the coordinate file, so that the data derived after the measurement is finished can be directly inverted.
S102, on the basis of a three-dimensional time domain induced polarization measurement protocol, equally dividing electrodes in a three-dimensional time domain induced polarization measurement line into a power supply electrode and a measurement electrode, classifying cables according to parity of cable numbers to obtain a power supply cable and a measurement cable, matching the power supply electrode and the power supply cable, and matching the measurement electrode and the measurement cable to obtain a first measurement result;
s103, interchanging the power supply electrode and the measuring electrode, correspondingly interchanging the power supply cable and the measuring cable, and carrying out mirror image measurement to obtain a second measuring result;
and S104, obtaining three-dimensional time domain induced polarization data based on the first measurement result and the second measurement result.
In S102, power supply and measurement cannot be used in a mixed mode in the primary measurement process, the power supply electrode is only used for power supply, and the measurement electrode is only used for measurement, so that the phenomenon that the polarization effect of the electrode and the nearby ground influences secondary electric field attenuation signals when the electrode is powered on, and the quality of measurement data is poor is avoided.
Electrodes in the three-dimensional time domain induced polarization measuring line are equally divided into a power supply electrode and a measuring electrode, current transmitted by an electrical method instrument is injected into an underground medium in a point power supply mode through the power supply electrode to form a primary electric field, and after the current is cut off, an attenuation curve of a secondary electric field is measured through the measuring electrode.
In S103, classifying the cables according to the parity of the cable number includes: and arranging the electrodes of the odd-numbered cables as stainless steel electrodes serving as power supply cables, and arranging the electrodes of the adjacent even-numbered cables as non-polarized electrodes or stainless steel electrodes serving as measuring cables.
This is done to reduce the adverse effects of electrode polarization and electromagnetic coupling on the quality of the induced polarization data.
Functionalizing different cables, wherein one part of the cables are only used for supplying power to serve as power supply cables, and the other part of the cables are only used for measuring and serve as measuring cables; by adopting the mode, the two-dimensional measurement method is expanded to the three-dimensional measurement of induced polarization, and the design work of a measurement protocol is simplified.
In S103, after the first measurement is finished, a certain time is set, after the power supply electrode and the nearby surface medium are discharged, the power supply electrode and the measuring electrode are exchanged, the power supply cable and the measuring cable are correspondingly exchanged, the odd cables are used as the measuring electrodes, the even cables are used as the power supply electrodes to perform the second measurement, and the second measurement and the first measurement result are cross-verified.
And during the second measurement, another cable can be arranged behind the last cable according to the cable distance, the measurement type of the cable is opposite to that of the last cable, the measurement line is integrally translated backwards by one cable distance, and the cables after the 2 nd cable are measured so as to simplify the work flow of exchanging the cables.
In S104, modifying the induced polarization measurement protocol, and recoding the two-dimensional protocol; two adjacent measuring lines are taken as a whole, the numbers of all measuring electrodes in the protocol are modified, the number of the electrodes of one measuring line is increased integrally, so that the numbers of the power supply electrodes on a pair of power supply cables after recoding are matched with the numbers of the measuring electrodes according to the protocol, and the purpose of carrying out three-dimensional induced polarization measurement by the improved two-dimensional induced polarization measurement protocol is achieved.
Selecting a certain grotto top to detect the water and salt distribution and the migration path of the underground space, and selecting a certain grotto top to detect the water and salt distribution and the migration path of the underground space;
in the first measurement, a modified two-dimensional multi-gradient array is used for three-dimensional induced polarization data acquisition. Functionalizing different cables, wherein one part of the cables are only used for supplying power to serve as power supply cables, and the other part of the cables are only used for measuring and serve as measuring cables; by adopting the mode, the two-dimensional measurement method is expanded to the three-dimensional measurement of induced polarization, and the design work of a measurement protocol is simplified.
Performing mirror image measurement to verify the data quality of the induced polarization signal; after the first measurement is finished, a certain time is set, after the power supply electrode and the nearby earth surface medium are discharged, the power supply electrode and the measuring electrode are exchanged, the power supply cable and the measuring cable are correspondingly exchanged, the odd cables are used as the measuring electrodes, the even cables are used as the power supply electrodes to carry out the second measurement, and the second measurement and the first measurement result are cross-verified.
And during the second measurement, another cable can be arranged behind the last cable according to the cable distance, the measurement type of the cable is opposite to that of the last cable, the measurement line is integrally translated backwards by one cable distance, and the cables after the 2 nd cable are measured so as to simplify the work flow of exchanging the cables.
FIG. 2 is a graph showing the results of induced polarization decay curves of the examples of the present invention. As shown in fig. 2, the method can effectively reduce the influence of electrode polarization and electromagnetic coupling in the three-dimensional induced polarization data acquisition process, improve the signal-to-noise ratio of the induced polarization data, acquire more accurate induced polarization signals, simplify the three-dimensional data acquisition of the induced polarization through the improvement of the two-dimensional induced polarization data acquisition method, improve the induced polarization data acquisition and processing efficiency, and can be applied to hydrology geophysical and environmental geophysical prospecting.
Example two
As shown in fig. 3 to 4, the present embodiment provides an induced polarization data acquisition device based on three-dimensional time domain, including an induced polarization data acquisition system and an electrode cable arrangement system;
the induced polarization data acquisition system comprises an electrical method instrument 101, an expansion box 102, a device connecting wire 103 and a storage battery 104;
the device connecting line 103 is used for connecting the electrical method instrument 101 with the expansion box 102 or the expansion box 102 with the next expansion box 102;
the electrode cable arrangement system comprises a plurality of cables 202, wherein each cable is sequentially numbered; each cable consists of two branch cables which are connected end to end, each branch cable is connected with a plurality of electrodes 201, and the electrodes 201 are sequentially numbered;
the electrical method instrument 101 and the expansion box 102 are respectively connected with corresponding cables 202 according to the serial numbers of the cables;
the electrical method instrument 101 is used for setting measurement parameters, based on the ground plane, the x direction is the direction parallel to the cable, the y direction is the direction perpendicular to the cable, the position of each electrode is represented by x and y coordinates, the z direction is the direction extending towards the underground, and measurement is carried out according to the cooperation of the measurement parameters, the cable and the electrodes to obtain three-dimensional time domain induced polarization data.
In this embodiment, after the measurement protocol is improved in the early stage, the data obtained by the electrical method instrument is the three-dimensional time domain induced polarization data without being processed.
The data format is: the first few rows are measurement parameters, and the last few thousand rows are obtained data; the first two columns of data are the x and y coordinates of the first power supply electrode, the third four columns are the x and y coordinates of the second power supply electrode, and the fifth six columns are the x and y coordinates of the first measuring electrode; the seventy-eight columns are the x and y coordinates of the second measurement electrode, and the later columns are resistivity and polarizability data corresponding to the former coordinates.
The cable and the electrodes are arranged on the ground plane, the x direction is parallel to the cable, the y direction is perpendicular to the cable, the position of each electrode can be represented by x and y coordinates, the Z direction is a direction extending towards the underground, the depth of the Z is related to the distance between the electrodes, and the larger the distance between the electrodes is, the deeper the depth of the Z is.
The time domain induced polarization measurement is the case of a two-dimensional underground section, reflecting information in the x and z directions directly below a survey line. The condition of the whole body under several parallel measuring lines is obtained by three-dimensional measurement, and the information in the x direction, the y direction and the z direction is reflected.
As one or more embodiments, set up first cable connector 1011 and second cable connector 1012 on the electrical method appearance 101, the first branch cable of first cable is connected to first cable connector, the second cable connector is connected the second branch cable of first cable, set up third cable connector 1021 and fourth cable connector 1022 on every expansion box 102, the first branch cable and the third cable connector 1021 of other cables link to each other, and the second divides cable and fourth cable connector 1022 to link to each other.
As one or more embodiments, the electrical method apparatus 101 has an extended box connector 1013, and the extended box 102 has a fifth connector 1023 and a sixth connector 1024;
the expansion box connector 1013 is connected with the device connecting line 103, the device connecting line 103 is connected with the fifth connector 1023, the fifth connector 1023 is connected with the sixth connector 1024 through the device connecting line 103, and so on until the expansion box is connected to the last expansion box.
The electrical method instrument 101 can perform 12-channel induced polarization data acquisition, and when the number of cable connectors of an expansion box used for the multi-channel electrical method instrument cannot meet three-dimensional investigation, a device connecting wire is used for connecting the electrical method instrument and the expansion box or the expansion box and the next expansion box; the fifth connector 1023 can be used as a connector of a previous expansion box and also as a connector of an electrical law instrument.
The electrical method instrument 101 and the expansion box 102 are both connected with a storage battery 104, and the storage battery is used for providing power supply needed by underground access and self work; the battery used in this example was a 12V lithium battery.
In one or more embodiments, the plurality of cables 202 are distributed parallel to each other;
each cable is numbered in sequence, the number of the first cable is No. 1, the numbers of other cables are No. 2, No. 3 and No. 4 … …, and all the cables are numbered;
each branch cable is connected with a plurality of electrodes, the electrodes are numbered in sequence, for example, each branch cable can be connected with 32 electrodes, the electrode number connected with the first branch cable of the No. 1 cable is No. 1-32, the electrode number connected with the second branch cable is No. 33-64, the electrode number connected with the first branch cable of the No. 2 cable is No. 65-96, the electrode number connected with the second branch cable is No. 97-128, and all the numbering of other cables is completed according to the rule.
In one or more embodiments, the cable 202 is divided into a power supply cable and a measurement cable, the electrode 201 is divided into a power supply electrode and a measurement electrode, the power supply cable and the measurement cable are distributed at intervals, the power supply cable is connected with the power supply electrode, and the measurement cable is connected with the measurement electrode.
In one or more embodiments, the power supply electrode is a stainless steel electrode, the measuring electrode is a non-polarized electrode or a stainless steel electrode, the stainless steel electrode is connected with a cable by a metal ring of the stainless steel electrode, and the non-polarized electrode is connected with the cable through an external device, depending on the electrode layout condition, the grounding resistance and the background resistivity in the field.
In one or more embodiments, each cable is used as a measuring line, and the numbers of the power supply electrodes and the measuring electrodes on the measuring lines of the adjacent power supply cables and measuring cables are matched with each other according to the protocol numbers to form a measuring whole.
The measurement protocol is modified for the two-dimensional induced polarization data acquisition mode. Recoding the two-dimensional protocol on the basis of the two-dimensional induced polarization measurement protocol; two adjacent measuring lines are taken as a whole, the numbers of all measuring electrodes in the protocol are modified, the number of the electrodes of one measuring line is increased integrally, so that the numbers of the power supply electrodes on a pair of power supply cables after recoding are matched with the numbers of the measuring electrodes according to the protocol, the purpose of carrying out three-dimensional induced polarization measurement by the improved two-dimensional induced polarization measurement protocol is realized, and the improved two-dimensional induced polarization measurement protocol is led into a multi-channel electrical method instrument capable of carrying out field detection so as to be used for field measurement.
In one or more embodiments, the electrical meter 101 may be used to set measurement parameters such as acquisition protocol, electrode spacing, acquisition mode, supply current, and decay time.
Wherein the acquisition protocol is a multi-gradient array modified for three-dimensional induced polarization measurement;
the electrode spacing is set as the actual field electrode spacing;
the acquisition mode is induced polarization measurement, and the maximum repeated measurement times are 2-4 times to ensure the balance of data quality and measurement time;
the decay time of the induced polarization is 1-8 seconds, the induced polarization is divided into 8-14 windows to record the induced polarization data, and the maximum power supply current is 100-500 mA.
As one or more embodiments, the arrangement work of the electrodes and the cables is first performed before the measurement is started. The spacing at which the electrodes are arranged depends on the size of the field, the desired depth of investigation and the resolution.
The electrode spacing in this example is two meters.
The arrangement position of the electrodes should be selected to be as open as possible, the relief of the ground is not large, and the ground surface has no hard materials such as rocks. Before arranging the electrodes, the starting points of the measuring lines are determined, a length measuring device is arranged between the starting points, and the positions of the electrodes are determined according to the reading of the length measuring device. Stainless steel electrodes are inserted 10-20 cm below the surface of the earth using a metal circular hammer, and the vicinity is compacted after being wetted with poured brine to ensure that the ground resistance is within an acceptable range, typically less than 1 kiloohm, during the measurement.
The non-polarized electrode is arranged by digging an electrode landfill body with the diameter of about 10 cm by a soldier shovel, pouring saline water at the bottom of the electrode landfill body and mixing the saline water with soil to form slurry, then putting the non-polarized electrode into the electrode landfill body and burying the electrode with the soil to compact the electrode landfill body, and ensuring that the ground resistance is within an acceptable range in the measuring process, wherein the ground resistance is generally less than 1 kiloohm.
As one or more embodiments, the three-dimensional time domain induced polarization data is: and (x, y, z) coordinate positions in the underground half space and a series of corresponding ratios of average secondary voltage to direct current voltage.
In the embodiment, the method for acquiring the induced polarization data of the two-dimensional time domain is modified to be used for three-dimensional induced polarization measurement, so that the three-dimensional data acquisition of the induced polarization signal is simplified; electrodes in the three-dimensional time domain induced polarization measuring line are equally divided into a power supply electrode and a measuring electrode, the power supply electrode is only used for supplying power, the measuring electrode is only used for measuring, different cables are functionalized, cables numbered in an odd number use stainless steel electrodes as power supply cables, cables numbered in an even number use non-polarized electrodes as measuring cables to finish measurement, and then the power supply electrode and the cables are exchanged to carry out mirror image measurement; recoding the electrode address file and the coordinate file in the measurement protocol so that the data format can be automatically exported. The data quality and the data acquisition and processing efficiency of the three-dimensional induced polarization measurement are improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A data acquisition method based on three-dimensional time domain induced polarization is characterized by comprising the following steps:
modifying based on a two-dimensional time domain induced polarization measurement protocol to obtain a protocol suitable for three-dimensional time domain induced polarization measurement;
on the basis of a three-dimensional time domain induced polarization measurement protocol, electrodes in a three-dimensional time domain induced polarization measurement line are equally divided into power supply electrodes and measurement electrodes, cables are classified according to parity of cable numbers to obtain power supply cables and measurement cables, the power supply electrodes are matched with the power supply cables, and the measurement electrodes are matched with the measurement cables to obtain a first measurement result;
exchanging the power supply electrode and the measuring electrode, correspondingly exchanging the power supply cable and the measuring cable, and carrying out mirror image measurement to obtain a second measuring result;
and obtaining three-dimensional time domain induced polarization data based on the first measurement result and the second measurement result.
2. The method for acquiring data based on three-dimensional time domain induced polarization according to claim 1, wherein in a primary measurement process, the electrodes in the three-dimensional time domain induced polarization measurement line are divided into a power supply electrode and a measurement electrode, the current transmitted by the electrical method instrument is injected into the underground medium in the form of a point power supply through the power supply electrode to form a primary electric field, and the attenuation curve of the secondary electric field is measured through the measurement electrode after the current is cut off.
3. The method for acquiring the data based on the induced polarization in the three-dimensional time domain as recited in claim 1, wherein after the first measurement is finished, and after the power supply electrode and the nearby surface medium are discharged, the power supply electrode and the measurement electrode are exchanged, the power supply cable and the measurement cable are correspondingly exchanged, the odd cables are used as the measurement electrodes, the even cables are used as the power supply electrodes for the second measurement, and the second measurement is cross-verified with the result of the first measurement.
4. The method for collecting data based on induced polarization in three-dimensional time domain according to claim 1, wherein during the second measurement, another cable is arranged behind the last cable according to the cable distance, the type of the cable to be measured is opposite to the type of the cable to be measured, and the whole measuring line is translated backwards by one cable distance.
5. The three-dimensional time domain-based induced polarization data acquisition method of claim 1, wherein the induced polarization measurement protocol is modified based on the first measurement result and the second measurement result, and the two-dimensional protocol is recoded; and taking two adjacent measuring lines as a whole, modifying the numbers of all measuring electrodes in the protocol, and increasing the number of the electrodes of one measuring line by the whole number of the measuring electrodes so that the numbers of the power supply electrodes on the pair of power supply cables after recoding are matched with the numbers of the measuring electrodes according to the protocol.
6. The device is characterized by comprising an induced polarization data acquisition system and an electrode cable arrangement system;
the induced polarization data acquisition system comprises an electrical method instrument, a plurality of expansion boxes and a device connecting wire, wherein the device connecting wire is used for connecting the electrical method instrument and the expansion boxes or connecting the expansion boxes and the next expansion box;
the electrode cable arrangement system comprises a plurality of cables, and each cable is sequentially numbered;
each cable consists of two branch cables which are connected end to end, each branch cable is connected with a plurality of electrodes, and the electrodes are numbered in sequence; the electric method instrument and the expansion box are respectively connected with corresponding cables according to the serial numbers of the cables;
the electrical method instrument is used for setting measurement parameters, and measuring according to the measurement parameters and the matching of the cable and the electrode to obtain three-dimensional time domain induced polarization data.
7. The data acquisition device based on the three-dimensional time domain induced polarization as claimed in claim 6, wherein the electrical method instrument is provided with a first cable connector and a second cable connector, the first cable connector is connected with a first branch cable of a first cable, the second cable connector is connected with a second branch cable of the first cable, each expansion box is provided with a third cable connector and a fourth cable connector, the first branch cables of the other cables are connected with the third cable connector, and the second branch cables are connected with the fourth cable connector.
8. The data acquisition device based on the three-dimensional time domain induced polarization as claimed in claim 6, wherein an expansion box connector is arranged on the electrical method instrument, and a fifth connector and a sixth connector are arranged on the expansion box;
the expansion box connector is connected with the device connecting line, the device connecting line is connected with the fifth connector, the fifth connector is connected with the sixth connector through the device connecting line, and the like until the expansion box is connected to the last expansion box.
9. The three-dimensional time domain induced polarization data acquisition device according to claim 6, wherein the cables are divided into a power supply cable and a measurement cable, the electrodes are divided into a power supply electrode and a measurement electrode, the power supply cable and the measurement cable are distributed at intervals, the power supply cable is connected with the power supply electrode, and the measurement cable is connected with the measurement electrode.
10. The three-dimensional time domain induced polarization data acquisition device as claimed in claim 9, wherein the power supply electrode is a stainless steel electrode, the measurement electrode is a non-polarized electrode or a stainless steel electrode, the stainless steel electrode is connected with a cable by a metal ring carried by the stainless steel electrode, and the non-polarized electrode is connected with the cable by an external device.
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